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Timeline of gravitational physics and relativity - Wikipedia

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class="vector-toc-numb">7.2</span> <span>2020s</span> </div> </a> <ul id="toc-2020s-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span 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He originally used <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/103168b86f781fe6e9a4a87b8ea1cebe0ad4ede8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.583ex; height:2.176ex;" alt="{\displaystyle L}"></span> instead of <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>E</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4232c9de2ee3eec0a9c0a19b15ab92daa6223f9b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.776ex; height:2.176ex;" alt="{\displaystyle E}"></span> to denote energy.</figcaption></figure> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output 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href="mw-data:TemplateStyles:r1129693374"><table class="sidebar sidebar-collapse nomobile nowraplinks plainlist"><tbody><tr><th class="sidebar-title"><a href="/wiki/General_relativity" title="General relativity">General relativity</a></th></tr><tr><td class="sidebar-image"><span class="notpageimage" typeof="mw:File"><a href="/wiki/File:Spacetime_lattice_analogy.svg" class="mw-file-description" title="Spacetime curvature schematic"><img alt="Spacetime curvature schematic" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Spacetime_lattice_analogy.svg/220px-Spacetime_lattice_analogy.svg.png" decoding="async" width="220" height="82" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Spacetime_lattice_analogy.svg/330px-Spacetime_lattice_analogy.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Spacetime_lattice_analogy.svg/440px-Spacetime_lattice_analogy.svg.png 2x" data-file-width="1260" data-file-height="469" /></a></span><div class="sidebar-caption" style="padding:0.5em 0.2em 0.6em;border-bottom:1px solid #aaa; display:block;margin-bottom:0.1em;"><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle G_{\mu \nu }+\Lambda g_{\mu \nu }={\kappa }T_{\mu \nu }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>G</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>&#x03BC;<!-- μ --></mi> <mi>&#x03BD;<!-- ν --></mi> </mrow> </msub> <mo>+</mo> <mi mathvariant="normal">&#x039B;<!-- Λ --></mi> <msub> <mi>g</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>&#x03BC;<!-- μ --></mi> <mi>&#x03BD;<!-- ν --></mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mi>&#x03BA;<!-- κ --></mi> </mrow> <msub> <mi>T</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>&#x03BC;<!-- μ --></mi> <mi>&#x03BD;<!-- ν --></mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle G_{\mu \nu }+\Lambda g_{\mu \nu }={\kappa }T_{\mu \nu }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/124ab80fcb17e2733cc17ff6f93da5e52f355c77" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:19.468ex; height:2.843ex;" alt="{\displaystyle G_{\mu \nu }+\Lambda g_{\mu \nu }={\kappa }T_{\mu \nu }}"></span></div></td></tr><tr><td class="sidebar-content" style="padding-bottom:0.75em;"> <ul><li><a href="/wiki/Introduction_to_general_relativity" title="Introduction to general relativity">Introduction</a></li> <li><div class="hlist"><ul><li><a href="/wiki/History_of_general_relativity" title="History of general relativity">History</a></li><li><a class="mw-selflink selflink">Timeline</a></li><li><a href="/wiki/Tests_of_general_relativity" title="Tests of general relativity">Tests</a></li></ul></div></li> <li><a href="/wiki/Mathematics_of_general_relativity" title="Mathematics of general relativity">Mathematical formulation</a></li></ul></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddf; text-align:center;;color: var(--color-base)"><div class="sidebar-list-title-c">Fundamental concepts</div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Equivalence_principle" title="Equivalence principle">Equivalence principle</a></li> <li><a href="/wiki/Special_relativity" title="Special relativity">Special relativity</a></li> <li><a href="/wiki/World_line" title="World line">World line</a></li> <li><a href="/wiki/Pseudo-Riemannian_manifold" title="Pseudo-Riemannian manifold">Pseudo-Riemannian manifold</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddf; text-align:center;;color: var(--color-base)"><div class="sidebar-list-title-c">Phenomena</div></div><div class="sidebar-list-content mw-collapsible-content hlist"><table class="sidebar nomobile nowraplinks" style="background-color: transparent; color: var( --color-base ); border-collapse:collapse; border-spacing:0px; border:none; width:100%; margin:0px; font-size:100%; clear:none; float:none"><tbody><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Two-body_problem_in_general_relativity" title="Two-body problem in general relativity">Kepler problem</a></li> <li><a href="/wiki/Gravitational_lens" title="Gravitational lens">Gravitational lensing</a></li> <li><a href="/wiki/Gravitational_redshift" title="Gravitational redshift">Gravitational redshift</a></li> <li><a href="/wiki/Gravitational_time_dilation" title="Gravitational time dilation">Gravitational time dilation</a></li> <li><a href="/wiki/Gravitational_wave" title="Gravitational wave">Gravitational waves</a></li> <li><a href="/wiki/Frame-dragging" title="Frame-dragging">Frame-dragging</a></li> <li><a href="/wiki/Geodetic_effect" title="Geodetic effect">Geodetic effect</a></li> <li><a href="/wiki/Event_horizon" title="Event horizon">Event horizon</a></li> <li><a href="/wiki/Gravitational_singularity" title="Gravitational singularity">Singularity</a></li> <li><a href="/wiki/Black_hole" title="Black hole">Black hole</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="background:#ececff; font-style:italic;font-weight:normal;"> <a href="/wiki/Spacetime" title="Spacetime">Spacetime</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Spacetime_diagram" title="Spacetime diagram">Spacetime diagrams</a></li> <li><a href="/wiki/Minkowski_space" title="Minkowski space">Minkowski spacetime</a></li> <li><a href="/wiki/Wormhole" title="Wormhole">Einstein–Rosen bridge</a></li></ul></td> </tr></tbody></table></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddf; text-align:center;;color: var(--color-base)"><div class="sidebar-list-title-c"><div class="hlist"><ul><li>Equations</li><li>Formalisms</li></ul></div></div></div><div class="sidebar-list-content mw-collapsible-content hlist"><table class="sidebar nomobile nowraplinks" style="background-color: transparent; color: var( --color-base ); border-collapse:collapse; border-spacing:0px; border:none; width:100%; margin:0px; font-size:100%; clear:none; float:none;padding-bottom:0;margin-bottom:0;"><tbody><tr><th class="sidebar-heading" style="font-style:italic;font-weight:normal;padding-bottom:0;"> Equations</th></tr><tr><td class="sidebar-content" style="padding-top:0;"> <ul><li><a href="/wiki/Linearized_gravity" title="Linearized gravity">Linearized gravity</a></li> <li><a href="/wiki/Einstein_field_equations" title="Einstein field equations">Einstein field equations</a></li> <li><a href="/wiki/Friedmann_equations" title="Friedmann equations">Friedmann</a></li> <li><a href="/wiki/Geodesics_in_general_relativity" title="Geodesics in general relativity">Geodesics</a></li> <li><a href="/wiki/Mathisson%E2%80%93Papapetrou%E2%80%93Dixon_equations" title="Mathisson–Papapetrou–Dixon equations">Mathisson–Papapetrou–Dixon</a></li> <li><a href="/wiki/Hamilton%E2%80%93Jacobi%E2%80%93Einstein_equation" title="Hamilton–Jacobi–Einstein equation">Hamilton–Jacobi–Einstein</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="font-style:italic;font-weight:normal;padding-bottom:0;"> Formalisms</th></tr><tr><td class="sidebar-content" style="padding-top:0;"> <ul><li><a href="/wiki/ADM_formalism" title="ADM formalism">ADM</a></li> <li><a href="/wiki/BSSN_formalism" title="BSSN formalism">BSSN</a></li> <li><a href="/wiki/Parameterized_post-Newtonian_formalism" title="Parameterized post-Newtonian formalism">Post-Newtonian</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="font-style:italic;font-weight:normal;padding-bottom:0;"> Advanced theory</th></tr><tr><td class="sidebar-content" style="padding-top:0;"> <ul><li><a href="/wiki/Kaluza%E2%80%93Klein_theory" title="Kaluza–Klein theory">Kaluza–Klein theory</a></li> <li><a href="/wiki/Quantum_gravity" title="Quantum gravity">Quantum gravity</a></li></ul></td> </tr></tbody></table></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddf; text-align:center;;color: var(--color-base)"><div class="sidebar-list-title-c"><a href="/wiki/Exact_solutions_in_general_relativity" title="Exact solutions in general relativity">Solutions</a></div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Schwarzschild_metric" title="Schwarzschild metric">Schwarzschild</a> (<a href="/wiki/Interior_Schwarzschild_metric" title="Interior Schwarzschild metric">interior</a>)</li> <li><a href="/wiki/Reissner%E2%80%93Nordstr%C3%B6m_metric" title="Reissner–Nordström metric">Reissner–Nordström</a></li> <li><a href="/wiki/Einstein%E2%80%93Rosen_metric" title="Einstein–Rosen metric">Einstein–Rosen waves</a></li> <li><a href="/wiki/Wormhole" title="Wormhole">Wormhole</a></li> <li><a href="/wiki/G%C3%B6del_metric" title="Gödel metric">Gödel</a></li> <li><a href="/wiki/Kerr_metric" title="Kerr metric">Kerr</a></li> <li><a href="/wiki/Kerr%E2%80%93Newman_metric" title="Kerr–Newman metric">Kerr–Newman</a></li> <li><a href="/wiki/Kerr%E2%80%93Newman%E2%80%93de%E2%80%93Sitter_metric" title="Kerr–Newman–de–Sitter metric">Kerr–Newman–de Sitter</a></li> <li><a href="/wiki/Kasner_metric" title="Kasner metric">Kasner</a></li> <li><a href="/wiki/Lema%C3%AEtre%E2%80%93Tolman_metric" title="Lemaître–Tolman metric">Lemaître–Tolman</a></li> <li><a href="/wiki/Taub%E2%80%93NUT_space" title="Taub–NUT space">Taub–NUT</a></li> <li><a href="/wiki/Milne_model" title="Milne model">Milne</a></li> <li><a href="/wiki/Friedmann%E2%80%93Lema%C3%AEtre%E2%80%93Robertson%E2%80%93Walker_metric" title="Friedmann–Lemaître–Robertson–Walker metric">Robertson–Walker</a></li> <li><a href="/wiki/Oppenheimer%E2%80%93Snyder_model" title="Oppenheimer–Snyder model">Oppenheimer–Snyder</a></li> <li><a href="/wiki/Pp-wave_spacetime" title="Pp-wave spacetime">pp-wave</a></li> <li><a href="/wiki/Van_Stockum_dust" title="Van Stockum dust">van Stockum dust</a></li> <li><a href="/wiki/Weyl%E2%80%93Lewis%E2%80%93Papapetrou_coordinates" title="Weyl–Lewis–Papapetrou coordinates">Weyl−Lewis−Papapetrou</a></li> <li><a href="/wiki/Hartle%E2%80%93Thorne_metric" title="Hartle–Thorne metric">Hartle–Thorne</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddf; text-align:center;;color: var(--color-base)"><div class="sidebar-list-title-c">Scientists</div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Albert_Einstein" title="Albert Einstein">Einstein</a></li> <li><a href="/wiki/Hendrik_Lorentz" title="Hendrik Lorentz">Lorentz</a></li> <li><a href="/wiki/David_Hilbert" title="David Hilbert">Hilbert</a></li> <li><a href="/wiki/Henri_Poincar%C3%A9" title="Henri Poincaré">Poincaré</a></li> <li><a href="/wiki/Karl_Schwarzschild" title="Karl Schwarzschild">Schwarzschild</a></li> <li><a href="/wiki/Willem_de_Sitter" title="Willem de Sitter">de Sitter</a></li> <li><a href="/wiki/Hans_Reissner" title="Hans Reissner">Reissner</a></li> <li><a href="/wiki/Gunnar_Nordstr%C3%B6m" title="Gunnar Nordström">Nordström</a></li> <li><a href="/wiki/Hermann_Weyl" title="Hermann Weyl">Weyl</a></li> <li><a href="/wiki/Arthur_Eddington" title="Arthur Eddington">Eddington</a></li> <li><a href="/wiki/Alexander_Friedmann" title="Alexander Friedmann">Friedmann</a></li> <li><a href="/wiki/Edward_Arthur_Milne" title="Edward Arthur Milne">Milne</a></li> <li><a href="/wiki/Fritz_Zwicky" title="Fritz Zwicky">Zwicky</a></li> <li><a href="/wiki/Georges_Lema%C3%AEtre" title="Georges Lemaître">Lemaître</a></li> <li><a href="/wiki/J._Robert_Oppenheimer" title="J. Robert Oppenheimer">Oppenheimer</a></li> <li><a href="/wiki/Kurt_G%C3%B6del" title="Kurt Gödel">Gödel</a></li> <li><a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">Wheeler</a></li> <li><a href="/wiki/Howard_P._Robertson" title="Howard P. Robertson">Robertson</a></li> <li><a href="/wiki/James_M._Bardeen" title="James M. Bardeen">Bardeen</a></li> <li><a href="/wiki/Arthur_Geoffrey_Walker" title="Arthur Geoffrey Walker">Walker</a></li> <li><a href="/wiki/Roy_Kerr" title="Roy Kerr">Kerr</a></li> <li><a href="/wiki/Subrahmanyan_Chandrasekhar" title="Subrahmanyan Chandrasekhar">Chandrasekhar</a></li> <li><a href="/wiki/J%C3%BCrgen_Ehlers" title="Jürgen Ehlers">Ehlers</a></li> <li><a href="/wiki/Roger_Penrose" title="Roger Penrose">Penrose</a></li> <li><a href="/wiki/Stephen_Hawking" title="Stephen Hawking">Hawking</a></li> <li><a href="/wiki/Amal_Kumar_Raychaudhuri" title="Amal Kumar Raychaudhuri">Raychaudhuri</a></li> <li><a href="/wiki/Joseph_Hooton_Taylor_Jr." title="Joseph Hooton Taylor Jr.">Taylor</a></li> <li><a href="/wiki/Russell_Alan_Hulse" title="Russell Alan Hulse">Hulse</a></li> <li><a href="/wiki/Willem_Jacob_van_Stockum" title="Willem Jacob van Stockum">van Stockum</a></li> <li><a href="/wiki/Abraham_H._Taub" title="Abraham H. Taub">Taub</a></li> <li><a href="/wiki/Ezra_T._Newman" title="Ezra T. Newman">Newman</a></li> <li><a href="/wiki/Shing-Tung_Yau" title="Shing-Tung Yau">Yau</a></li> <li><a href="/wiki/Kip_Thorne" title="Kip Thorne">Thorne</a></li> <li><a href="/wiki/List_of_contributors_to_general_relativity" title="List of contributors to general relativity"><i>others</i></a></li></ul></div></div></td> </tr><tr><td class="sidebar-below hlist" style="background-color: transparent; border-color: #A2B8BF"> <ul><li><span class="nowrap"><span class="nowrap"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/14px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png" decoding="async" width="14" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/21px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg/28px-Stylised_atom_with_three_Bohr_model_orbits_and_stylised_nucleus.svg.png 2x" data-file-width="530" data-file-height="600" /></a></span> </span><a href="/wiki/Portal:Physics" title="Portal:Physics">Physics&#32;portal</a></span></li> <li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span>&#160;<a href="/wiki/Category:General_relativity" title="Category:General relativity">Category</a></span></li></ul></td></tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:General_relativity_sidebar" title="Template:General relativity sidebar"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:General_relativity_sidebar" title="Template talk:General relativity sidebar"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:General_relativity_sidebar" title="Special:EditPage/Template:General relativity sidebar"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The following is a <b><a href="/wiki/Timeline" title="Timeline">timeline</a> of <a href="/wiki/Gravitational_physics" class="mw-redirect" title="Gravitational physics">gravitational physics</a> and <a href="/wiki/General_relativity" title="General relativity">general relativity</a></b>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Before_1500">Before 1500</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=1" title="Edit section: Before 1500"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>3rd century B.C. – <a href="/wiki/Aristarchus_of_Samos" title="Aristarchus of Samos">Aristarchus of Samos</a> proposes the <a href="/wiki/Heliocentrism" title="Heliocentrism">heliocentric model</a>.<sup id="cite_ref-:9_1-0" class="reference"><a href="#cite_note-:9-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="1500s">1500s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=2" title="Edit section: 1500s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1543 – <a href="/wiki/Nicolaus_Copernicus" title="Nicolaus Copernicus">Nicolaus Copernicus</a> publishes <a href="/wiki/De_revolutionibus_orbium_coelestium" title="De revolutionibus orbium coelestium"><i>On the Revolutions of Heavenly Spheres</i></a>.<sup id="cite_ref-:9_1-1" class="reference"><a href="#cite_note-:9-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup></li> <li>1583 – <a href="/wiki/Galileo_Galilei" title="Galileo Galilei">Galileo Galilei</a> deduces the period relationship of a <a href="/wiki/Pendulum" title="Pendulum">pendulum</a> from observations (according to later biographer).</li> <li>1586 – <a href="/wiki/Simon_Stevin" title="Simon Stevin">Simon Stevin</a> demonstrates that two objects of different mass accelerate at the same rate when dropped.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup></li> <li>1589 – Galileo Galilei describes a <a href="/wiki/Hydrostatic_balance" class="mw-redirect" title="Hydrostatic balance">hydrostatic balance</a> for measuring <a href="/wiki/Specific_gravity" class="mw-redirect" title="Specific gravity">specific gravity</a>.</li> <li>1590 – Galileo Galilei formulates modified <a href="/wiki/Aristotle" title="Aristotle">Aristotelean</a> theory of motion (later retracted) based on <a href="/wiki/Density" title="Density">density</a> rather than weight of objects.</li></ul> <div class="mw-heading mw-heading2"><h2 id="1600s">1600s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=3" title="Edit section: 1600s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Principia1846-105.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Principia1846-105.png/220px-Principia1846-105.png" decoding="async" width="220" height="221" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Principia1846-105.png/330px-Principia1846-105.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/01/Principia1846-105.png/440px-Principia1846-105.png 2x" data-file-width="1524" data-file-height="1532" /></a><figcaption>Geometric diagram for Newton's proof of Kepler's second law.</figcaption></figure> <ul><li>1602-1608 – Galileo Galilei experiments with pendulum motion and <a href="/wiki/Inclined_plane" title="Inclined plane">inclined planes</a>; deduces his law of <a href="/wiki/Free_fall" title="Free fall">free fall</a>; and discovers that <a href="/wiki/Projectile" title="Projectile">projectiles</a> travel along <a href="/wiki/Parabola" title="Parabola">parabolic</a> trajectories.<sup id="cite_ref-:11_3-0" class="reference"><a href="#cite_note-:11-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup></li> <li>1609 – <a href="/wiki/Johannes_Kepler" title="Johannes Kepler">Johannes Kepler</a> announces his first two <a href="/wiki/Kepler%27s_laws_of_planetary_motion" title="Kepler&#39;s laws of planetary motion">laws of planetary motion</a>.<sup id="cite_ref-:8_4-0" class="reference"><a href="#cite_note-:8-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup></li> <li>1610 – Johannes Kepler states the <a href="/wiki/Olbers%27s_paradox" title="Olbers&#39;s paradox">dark night paradox</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">&#91;</span>5<span class="cite-bracket">&#93;</span></a></sup></li> <li>1610 – Galileo Galilei publishes <i><a href="/wiki/Sidereus_Nuncius" title="Sidereus Nuncius">The Sidereal Messenger</a></i>, detailing his astronomical discoveries made with a telescope.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">&#91;</span>6<span class="cite-bracket">&#93;</span></a></sup></li> <li>1619 – Johannes Kepler unveils his third law of planetary motion.<sup id="cite_ref-:8_4-1" class="reference"><a href="#cite_note-:8-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup></li> <li>1665-66 – <a href="/wiki/Isaac_Newton" title="Isaac Newton">Isaac Newton</a> introduces an inverse-square <a href="/wiki/Newton%27s_law_of_universal_gravitation" title="Newton&#39;s law of universal gravitation">law of universal gravitation</a> uniting terrestrial and celestial theories of motion and uses it to predict the orbit of the <a href="/wiki/Moon" title="Moon">Moon</a> and the parabolic arc of projectiles (the latter using his <a href="/wiki/Binomial_series" title="Binomial series">generalization of the binomial theorem</a>).<sup id="cite_ref-:10_7-0" class="reference"><a href="#cite_note-:10-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup></li> <li>1676-9 – <a href="/wiki/Ole_R%C3%B8mer" title="Ole Rømer">Ole Rømer</a> makes the first scientific determination of the <a href="/wiki/Speed_of_light" title="Speed of light">speed of light</a>.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup></li> <li>1684 – Isaac Newton proves that <a href="/wiki/Planet" title="Planet">planets</a> moving under an inverse-square force law will obey <a href="/wiki/Kepler%27s_laws" class="mw-redirect" title="Kepler&#39;s laws">Kepler's laws</a> in <a href="/wiki/De_motu_corporum_in_gyrum" title="De motu corporum in gyrum">a letter</a> to Edmond Halley.<sup id="cite_ref-:10_7-1" class="reference"><a href="#cite_note-:10-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup></li> <li>1686 – Isaac Newton uses a fixed length pendulum with weights of varying composition to test the <a href="/wiki/Weak_equivalence_principle" class="mw-redirect" title="Weak equivalence principle">weak equivalence principle</a> to 1 part in 1000.<sup id="cite_ref-:7_9-0" class="reference"><a href="#cite_note-:7-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">&#91;</span>10<span class="cite-bracket">&#93;</span></a></sup></li> <li>1686 – Isaac Newton publishes his <i><a href="/wiki/Philosophi%C3%A6_Naturalis_Principia_Mathematica" title="Philosophiæ Naturalis Principia Mathematica">Mathematical Principles of Natural Philosophy</a></i>, where he develops his <a href="/wiki/Fluxion" title="Fluxion">calculus</a>, states his <a href="/wiki/Newton%27s_laws_of_motion" title="Newton&#39;s laws of motion">laws of motion</a> and gravitation, proves the <a href="/wiki/Shell_theorem" title="Shell theorem">shell theorem</a>, describes his <a href="/wiki/Bucket_argument" title="Bucket argument">rotating bucket</a> thought experiment, explains the <a href="/wiki/Tidal_force" title="Tidal force">tides</a>, and calculates the <a href="/wiki/Figure_of_the_Earth" title="Figure of the Earth">figure of the Earth</a>.<sup id="cite_ref-:7_9-1" class="reference"><a href="#cite_note-:7-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="1700s">1700s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=4" title="Edit section: 1700s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Lagrange_very_massive.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Lagrange_very_massive.svg/220px-Lagrange_very_massive.svg.png" decoding="async" width="220" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Lagrange_very_massive.svg/330px-Lagrange_very_massive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Lagrange_very_massive.svg/440px-Lagrange_very_massive.svg.png 2x" data-file-width="500" data-file-height="400" /></a><figcaption>Lagrange points</figcaption></figure> <ul><li>1705 – <a href="/wiki/Edmond_Halley" title="Edmond Halley">Edmond Halley</a> predicts the return of <a href="/wiki/Halley%27s_Comet" title="Halley&#39;s Comet">Halley's comet</a> in 1758,<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">&#91;</span>11<span class="cite-bracket">&#93;</span></a></sup> the first use of Newton's laws by someone other than Newton himself.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">&#91;</span>12<span class="cite-bracket">&#93;</span></a></sup></li> <li>1728 – Isaac Newton posthumously publishes his <a href="/wiki/Newton%27s_cannonball" title="Newton&#39;s cannonball">cannonball</a> thought experiment.<sup id="cite_ref-treatiselat_13-0" class="reference"><a href="#cite_note-treatiselat-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-cohen2004_14-0" class="reference"><a href="#cite_note-cohen2004-14"><span class="cite-bracket">&#91;</span>14<span class="cite-bracket">&#93;</span></a></sup></li> <li>1742 – <a href="/wiki/Colin_Maclaurin" title="Colin Maclaurin">Colin Maclaurin</a> studies a self-gravitating uniform liquid drop at <a href="/wiki/Hydrostatic_equilibrium" title="Hydrostatic equilibrium">equilibrium</a>, the <a href="/wiki/Maclaurin_spheroid" title="Maclaurin spheroid">Maclaurin spheroid</a>.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">&#91;</span>15<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">&#91;</span>16<span class="cite-bracket">&#93;</span></a></sup></li> <li>1755 – <a href="/wiki/Immanuel_Kant" title="Immanuel Kant">Immanuel Kant</a> advances <a href="/wiki/Emanuel_Swedenborg" title="Emanuel Swedenborg">Emanuel Swedenborg</a>'s nebular hypothesis on the origin of the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>.<sup id="cite_ref-Woolfson1993_17-0" class="reference"><a href="#cite_note-Woolfson1993-17"><span class="cite-bracket">&#91;</span>17<span class="cite-bracket">&#93;</span></a></sup></li> <li>1765 – Leonhard Euler discovers the first three Lagrange points.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">&#91;</span>18<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-E327_19-0" class="reference"><a href="#cite_note-E327-19"><span class="cite-bracket">&#91;</span>19<span class="cite-bracket">&#93;</span></a></sup></li> <li>1767 – <a href="/wiki/Leonhard_Euler" title="Leonhard Euler">Leonhard Euler</a> solves Euler's <a href="/wiki/Euler%27s_three-body_problem" title="Euler&#39;s three-body problem">restricted three-body problem</a>.<sup id="cite_ref-euler_1760_20-0" class="reference"><a href="#cite_note-euler_1760-20"><span class="cite-bracket">&#91;</span>20<span class="cite-bracket">&#93;</span></a></sup></li> <li>1772 – <a href="/wiki/Joseph-Louis_Lagrange" title="Joseph-Louis Lagrange">Joseph-Louis Lagrange</a> discovers the two remaining <a href="/wiki/Lagrange_point" title="Lagrange point">Lagrange points</a>.<sup id="cite_ref-gallica.bnf.fr2_21-0" class="reference"><a href="#cite_note-gallica.bnf.fr2-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup></li> <li>1796 – <a href="/wiki/Pierre-Simon_Laplace" title="Pierre-Simon Laplace">Pierre-Simon de Laplace</a> independently introduces the <a href="/wiki/Nebular_hypothesis" title="Nebular hypothesis">nebular hypothesis</a>.<sup id="cite_ref-Woolfson1993_17-1" class="reference"><a href="#cite_note-Woolfson1993-17"><span class="cite-bracket">&#91;</span>17<span class="cite-bracket">&#93;</span></a></sup></li> <li>1798 – <a href="/wiki/Henry_Cavendish" title="Henry Cavendish">Henry Cavendish</a> tests Newton's law of universal gravitation using a <a href="/wiki/Cavendish_experiment" title="Cavendish experiment">torsion balance</a>, leading to the first accurate value for the <a href="/wiki/Gravitational_constant" title="Gravitational constant">gravitational constant</a> and the mean density of the Earth.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">&#91;</span>22<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">&#91;</span>23<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="1800s">1800s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=5" title="Edit section: 1800s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1846 – <a href="/wiki/Urbain_Le_Verrier" title="Urbain Le Verrier">Urbain Le Verrier</a> and <a href="/wiki/John_Couch_Adams" title="John Couch Adams">John Couch Adams</a>, studying <a href="/wiki/Uranus" title="Uranus">Uranus</a>' orbit, independently prove that another, farther planet must exist. <a href="/wiki/Neptune" title="Neptune">Neptune</a> was found at the predicted moment and position.</li> <li>1855 – Le Verrier observes a 35 arcsecond per century excess <a href="/wiki/Precession" title="Precession">precession</a> of <a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a>'s <a href="/wiki/Orbit" title="Orbit">orbit</a> and attributes it to another planet, inside Mercury's orbit. The planet was never found. See <a href="/wiki/Vulcan_(planet)" class="mw-redirect" title="Vulcan (planet)">Vulcan</a>.</li> <li>1876 – <a href="/wiki/William_Kingdon_Clifford" title="William Kingdon Clifford">William Kingdon Clifford</a> suggests that the motion of matter may be due to changes in the geometry of space.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">&#91;</span>24<span class="cite-bracket">&#93;</span></a></sup></li> <li>1882 – <a href="/wiki/Simon_Newcomb" title="Simon Newcomb">Simon Newcomb</a> observes a 43 arcsecond per century excess precession of Mercury's orbit.</li> <li>1884 – William Thomson (<a href="/wiki/Lord_Kelvin" title="Lord Kelvin">Lord Kelvin</a>) lectures on the issues with the wave theory of light with regards to the <a href="/wiki/Luminiferous_aether" title="Luminiferous aether">luminiferous ether</a>.<sup id="cite_ref-:15_25-0" class="reference"><a href="#cite_note-:15-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup></li> <li>1887 – <a href="/wiki/Albert_A._Michelson" title="Albert A. Michelson">Albert A. Michelson</a> and <a href="/wiki/Edward_W._Morley" title="Edward W. Morley">Edward W. Morley</a> in <a href="/wiki/Michelson%E2%80%93Morley_experiment" title="Michelson–Morley experiment">their famous experiment</a> do not detect the ether drift.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">&#91;</span>26<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">&#91;</span>27<span class="cite-bracket">&#93;</span></a></sup></li> <li>1889 – <a href="/wiki/Lor%C3%A1nd_E%C3%B6tv%C3%B6s" title="Loránd Eötvös">Loránd Eötvös</a> uses a <a href="/wiki/Torsion_spring#Torsion_balance" title="Torsion spring">torsion balance</a> to test the <a href="/wiki/Weak_equivalence_principle" class="mw-redirect" title="Weak equivalence principle">weak equivalence principle</a> to 1 part in one billion.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">&#91;</span>28<span class="cite-bracket">&#93;</span></a></sup></li> <li>1887 – <a href="/wiki/George_Francis_FitzGerald" title="George Francis FitzGerald">George Francis FitzGerald</a> explains his hypothesis that the Michelson-Morley interferometer <a href="/wiki/Fitzgerald-Lorentz_contraction" class="mw-redirect" title="Fitzgerald-Lorentz contraction">contracts</a> in the direction of motion through the <a href="/wiki/Luminiferous_aether" title="Luminiferous aether">luminiferous ether</a> to <a href="/wiki/Oliver_Lodge" title="Oliver Lodge">Oliver Lodge</a>.<sup id="cite_ref-:15_25-1" class="reference"><a href="#cite_note-:15-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup></li> <li>1893 – <a href="/wiki/Ernst_Mach" title="Ernst Mach">Ernst Mach</a> states <a href="/wiki/Mach%27s_principle" title="Mach&#39;s principle">Mach's principle</a>, the first constructive critique of the idea of Newtonian absolute space.</li> <li>1897 – <a href="/wiki/Henri_Poincar%C3%A9" title="Henri Poincaré">Henri Poincaré</a> questions whether absolute space, absolute time, and <a href="/wiki/Euclidean_geometry" title="Euclidean geometry">Euclidean geometry</a> are applicable to physics.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">&#91;</span>29<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="1900s">1900s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=6" title="Edit section: 1900s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:USS_Enterprise_(CVAN-65),_USS_Long_Beach_(CGN-9)_and_USS_Bainbridge_(DLGN-25)_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit,_in_1964.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg/220px-USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg" decoding="async" width="220" height="163" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg/330px-USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4c/USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg/440px-USS_Enterprise_%28CVAN-65%29%2C_USS_Long_Beach_%28CGN-9%29_and_USS_Bainbridge_%28DLGN-25%29_underway_in_the_Mediterranean_Sea_during_Operation_Sea_Orbit%2C_in_1964.jpg 2x" data-file-width="1062" data-file-height="786" /></a><figcaption>The U.S. Navy's nuclear-powered Task Force 1 underway for <a href="/wiki/Operation_Sea_Orbit" title="Operation Sea Orbit">Operation Sea Orbit</a> in the Mediterranean, 1964.</figcaption></figure> <ul><li>1902 – <a href="/wiki/Paul_Gerber" title="Paul Gerber">Paul Gerber</a> explains the movement of the perihelion of Mercury using finite speed of gravity.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">&#91;</span>30<span class="cite-bracket">&#93;</span></a></sup> His formula, at least approximately, matches the later model from Einstein's general relativity, but Gerber's theory was incorrect.</li> <li>1902 – Henri Poincaré questions the concept of <a href="/wiki/Relativity_of_simultaneity" title="Relativity of simultaneity">simultaneity</a> in his book, <i><a href="/wiki/Science_and_Hypothesis" title="Science and Hypothesis">Science and Hypothesis</a></i>.<sup id="cite_ref-:12_31-0" class="reference"><a href="#cite_note-:12-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">&#91;</span>32<span class="cite-bracket">&#93;</span></a></sup></li> <li>1904 – <a href="/wiki/Hendrik_Antoon_Lorentz" class="mw-redirect" title="Hendrik Antoon Lorentz">Hendrik Antoon Lorentz</a> publishes the <a href="/wiki/Lorentz_transformation" title="Lorentz transformation">Lorentz transformations</a>,<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">&#91;</span>33<span class="cite-bracket">&#93;</span></a></sup> so named by Henri Poincaré.<sup id="cite_ref-:15_25-2" class="reference"><a href="#cite_note-:15-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup></li> <li>1902 – Henri Poincaré shows that the Lorentz transformations form a <a href="/wiki/Group_(mathematics)" title="Group (mathematics)">mathematical group</a>, called the <a href="/wiki/Lorentz_group" title="Lorentz group">Lorentz group</a>, and derives the <a href="/wiki/Velocity-addition_formula" title="Velocity-addition formula">relativistic formula for adding velocities</a>.<sup id="cite_ref-:15_25-3" class="reference"><a href="#cite_note-:15-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup></li> <li>1905 – <a href="/wiki/Albert_Einstein" title="Albert Einstein">Albert Einstein</a> completes his <a href="/wiki/Special_relativity" title="Special relativity">special theory of relativity</a><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">&#91;</span>34<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:82_35-0" class="reference"><a href="#cite_note-:82-35"><span class="cite-bracket">&#91;</span>35<span class="cite-bracket">&#93;</span></a></sup> and examines <a href="/wiki/Relativistic_aberration" title="Relativistic aberration">relativistic aberration</a> and the <a href="/wiki/Transverse_Doppler_effect" class="mw-redirect" title="Transverse Doppler effect">transverse Doppler effect</a>.<sup id="cite_ref-:15_25-4" class="reference"><a href="#cite_note-:15-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup></li> <li>1905 – Albert Einstein discovers the <a href="/wiki/Mass%E2%80%93energy_equivalence" title="Mass–energy equivalence">equivalence of mass and energy</a>,<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">&#91;</span>36<span class="cite-bracket">&#93;</span></a></sup> <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E=mc^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>E</mi> <mo>=</mo> <mi>m</mi> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E=mc^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9f73dbd37a0cac34406ee89057fa1b36a1e6a18e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:8.976ex; height:2.676ex;" alt="{\displaystyle E=mc^{2}}"></span> in modern form.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">&#91;</span>37<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">&#91;</span>38<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:12_31-1" class="reference"><a href="#cite_note-:12-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup></li> <li>1906 – <a href="/wiki/Max_Planck" title="Max Planck">Max Planck</a> coins the term <i>Relativtheorie</i>. Albert Einstein later uses the term <i>Relativitätstheorie</i> in a conversation with Paul Ehrenfest. He originally prefers calling it Invariance Theory.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">&#91;</span>39<span class="cite-bracket">&#93;</span></a></sup></li> <li>1906 – Max Planck formulates a <a href="/wiki/Variational_principle" title="Variational principle">variational principle</a> for special relativity.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">&#91;</span>40<span class="cite-bracket">&#93;</span></a></sup></li> <li>1907 – Albert Einstein introduces the <a href="/wiki/Equivalence_principle" title="Equivalence principle">principle of equivalence</a> of gravitational and inertial mass and uses it to predict gravitational lensing and <a href="/wiki/Gravitational_redshift" title="Gravitational redshift">gravitational redshift</a>,<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">&#91;</span>41<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-0" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup> historically known as the Einstein shift.<sup id="cite_ref-:4_43-0" class="reference"><a href="#cite_note-:4-43"><span class="cite-bracket">&#91;</span>43<span class="cite-bracket">&#93;</span></a></sup></li> <li>1907-8 – <a href="/wiki/Hermann_Minkowski" title="Hermann Minkowski">Hermann Minkowski</a> introduces the <a href="/wiki/Minkowski_spacetime" class="mw-redirect" title="Minkowski spacetime">Minkowski spacetime</a> and the notion of <a href="/wiki/Tensor" title="Tensor">tensors</a> to relativity. His paper was published posthumously.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">&#91;</span>44<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">&#91;</span>45<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">&#91;</span>46<span class="cite-bracket">&#93;</span></a></sup></li> <li>1909 – <a href="/wiki/Max_Born" title="Max Born">Max Born</a> proposes <a href="/wiki/Born_rigidity" title="Born rigidity">his notion of rigidity</a>.<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">&#91;</span>47<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">&#91;</span>48<span class="cite-bracket">&#93;</span></a></sup></li> <li>1909 – <a href="/wiki/Paul_Ehrenfest" title="Paul Ehrenfest">Paul Ehrenfest</a> states the <a href="/wiki/Ehrenfest_paradox" title="Ehrenfest paradox">Ehrenfest paradox</a>.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">&#91;</span>49<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">&#91;</span>50<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1910s">1910s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=7" title="Edit section: 1910s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Einstein%27s_argument_that_falling_light_acquires_energy.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Einstein%27s_argument_that_falling_light_acquires_energy.svg/220px-Einstein%27s_argument_that_falling_light_acquires_energy.svg.png" decoding="async" width="220" height="265" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Einstein%27s_argument_that_falling_light_acquires_energy.svg/330px-Einstein%27s_argument_that_falling_light_acquires_energy.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Einstein%27s_argument_that_falling_light_acquires_energy.svg/440px-Einstein%27s_argument_that_falling_light_acquires_energy.svg.png 2x" data-file-width="332" data-file-height="400" /></a><figcaption>Einstein's 1911 argument for gravitational redshift</figcaption></figure> <ul><li>1911 – <a href="/wiki/Max_von_Laue" title="Max von Laue">Max von Laue</a> publishes the first textbook on special relativity.<sup id="cite_ref-:14_51-0" class="reference"><a href="#cite_note-:14-51"><span class="cite-bracket">&#91;</span>51<span class="cite-bracket">&#93;</span></a></sup></li> <li>1911 – Albert Einstein explains the need to replace both special relativity and Newton's theory of gravity; he realizes that the principle of equivalence only holds locally, not globally.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">&#91;</span>52<span class="cite-bracket">&#93;</span></a></sup></li> <li>1912 – <a href="/wiki/Friedrich_Kottler" title="Friedrich Kottler">Friedrich Kottler</a> applies the notion of tensors to curved spacetime.<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">&#91;</span>53<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:14_51-1" class="reference"><a href="#cite_note-:14-51"><span class="cite-bracket">&#91;</span>51<span class="cite-bracket">&#93;</span></a></sup></li> <li>1915-16 – Albert Einstein completes his <a href="/wiki/General_relativity" title="General relativity">general theory of relativity</a>.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">&#91;</span>54<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:13_55-0" class="reference"><a href="#cite_note-:13-55"><span class="cite-bracket">&#91;</span>55<span class="cite-bracket">&#93;</span></a></sup> He explains the <a href="/wiki/Perihelion" class="mw-redirect" title="Perihelion">perihelion</a> of Mercury and calculates <a href="/wiki/Gravitational_lens" title="Gravitational lens">gravitational lensing</a> correctly and introduces the <a href="/wiki/Post-Newtonian_expansion" title="Post-Newtonian expansion">post-Newtonian approximation</a>.<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">&#91;</span>56<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">&#91;</span>57<span class="cite-bracket">&#93;</span></a></sup></li> <li>1915 – <a href="/wiki/David_Hilbert" title="David Hilbert">David Hilbert</a> independently introduces the <a href="/wiki/Einstein%E2%80%93Hilbert_action" title="Einstein–Hilbert action">Einstein-Hilbert action</a>.<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">&#91;</span>58<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:13_55-1" class="reference"><a href="#cite_note-:13-55"><span class="cite-bracket">&#91;</span>55<span class="cite-bracket">&#93;</span></a></sup> Hilbert also recognizes the connection between the Einstein equations and the <a href="/wiki/Gauss%E2%80%93Bonnet_theorem" title="Gauss–Bonnet theorem">Gauss-Bonnet theorem</a>.<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">&#91;</span>59<span class="cite-bracket">&#93;</span></a></sup></li> <li>1916 – <a href="/wiki/Karl_Schwarzschild" title="Karl Schwarzschild">Karl Schwarzschild</a> publishes the <a href="/wiki/Schwarzschild_metric" title="Schwarzschild metric">Schwarzschild metric</a> about a month after Einstein published his general theory of relativity.<sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">&#91;</span>60<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">&#91;</span>61<span class="cite-bracket">&#93;</span></a></sup> This was the first solution to the Einstein field equations other than the trivial flat space solution.<sup id="cite_ref-Levy_62-0" class="reference"><a href="#cite_note-Levy-62"><span class="cite-bracket">&#91;</span>62<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Eisenstaedt,_1989_63-0" class="reference"><a href="#cite_note-Eisenstaedt,_1989-63"><span class="cite-bracket">&#91;</span>63<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">&#91;</span>64<span class="cite-bracket">&#93;</span></a></sup></li> <li>1916 – Albert Einstein predicts <a href="/wiki/Gravitational_wave" title="Gravitational wave">gravitational waves</a>.<sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">&#91;</span>65<span class="cite-bracket">&#93;</span></a></sup></li> <li>1916 – <a href="/wiki/Willem_de_Sitter" title="Willem de Sitter">Willem de Sitter</a> predicts the <a href="/wiki/Geodetic_effect" title="Geodetic effect">geodetic effect</a>.<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">&#91;</span>66<span class="cite-bracket">&#93;</span></a></sup></li> <li>1917 – Albert Einstein applies his field equations to the entire Universe.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">&#91;</span>67<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Physical_cosmology" title="Physical cosmology">Physical cosmology</a> is born.<sup id="cite_ref-:22_42-1" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1916-20 – <a href="/wiki/Arthur_Eddington" title="Arthur Eddington">Arthur Eddington</a> studies the internal constitution of the stars.<sup id="cite_ref-eddington_68-0" class="reference"><a href="#cite_note-eddington-68"><span class="cite-bracket">&#91;</span>68<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-eddington2_69-0" class="reference"><a href="#cite_note-eddington2-69"><span class="cite-bracket">&#91;</span>69<span class="cite-bracket">&#93;</span></a></sup></li> <li>1918 – Albert Einstein derives the <a href="/wiki/Quadrupole_formula" title="Quadrupole formula">quadrupole formula</a> for gravitational radiation.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">&#91;</span>70<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-71" class="reference"><a href="#cite_note-71"><span class="cite-bracket">&#91;</span>71<span class="cite-bracket">&#93;</span></a></sup></li> <li>1918 – <a href="/wiki/Josef_Lense" title="Josef Lense">Josef Lense</a> and <a href="/wiki/Hans_Thirring" title="Hans Thirring">Hans Thirring</a> find the <a href="/wiki/Gravitoelectromagnetism" title="Gravitoelectromagnetism">gravitomagnetic</a> <a href="/wiki/Frame-dragging" title="Frame-dragging">frame-dragging</a> of <a href="/wiki/Gyroscope" title="Gyroscope">gyroscopes</a> in the equations of general relativity.<sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">&#91;</span>72<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-73" class="reference"><a href="#cite_note-73"><span class="cite-bracket">&#91;</span>73<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-74" class="reference"><a href="#cite_note-74"><span class="cite-bracket">&#91;</span>74<span class="cite-bracket">&#93;</span></a></sup></li> <li>1919 – Arthur Eddington leads a <a href="/wiki/Eddington_experiment" title="Eddington experiment">solar eclipse expedition</a> which detects gravitational deflection of light by the Sun,<sup id="cite_ref-Eddington1920_75-0" class="reference"><a href="#cite_note-Eddington1920-75"><span class="cite-bracket">&#91;</span>75<span class="cite-bracket">&#93;</span></a></sup> which, despite opinion to the contrary, survives modern scrutiny.<sup id="cite_ref-PhysToday_76-0" class="reference"><a href="#cite_note-PhysToday-76"><span class="cite-bracket">&#91;</span>76<span class="cite-bracket">&#93;</span></a></sup> Other teams fail for reasons of <a href="/wiki/World_War_I" title="World War I">war</a> and politics.<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">&#91;</span>77<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1920s">1920s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=8" title="Edit section: 1920s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1921 – <a href="/wiki/Theodor_Kaluza" title="Theodor Kaluza">Theodor Kaluza</a> demonstrates that a <a href="/wiki/Kaluza%E2%80%93Klein_theory" title="Kaluza–Klein theory">five-dimensional version of Einstein's equations</a> unifies <a href="/wiki/Gravitation" class="mw-redirect" title="Gravitation">gravitation</a> and <a href="/wiki/Electromagnetism" title="Electromagnetism">electromagnetism</a>.<sup id="cite_ref-kal_78-0" class="reference"><a href="#cite_note-kal-78"><span class="cite-bracket">&#91;</span>78<span class="cite-bracket">&#93;</span></a></sup> This idea is later extended by <a href="/wiki/Oskar_Klein" title="Oskar Klein">Oskar Klein</a>.<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">&#91;</span>79<span class="cite-bracket">&#93;</span></a></sup></li> <li>1922 – <a href="/wiki/Alexander_Friedmann" title="Alexander Friedmann">Alexander Friedmann</a> derives the <a href="/wiki/Friedmann_equations" title="Friedmann equations">Friedmann equations</a>.<sup id="cite_ref-af1922_80-0" class="reference"><a href="#cite_note-af1922-80"><span class="cite-bracket">&#91;</span>80<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-2" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1922 – <a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Enrico Fermi</a> introduces the <a href="/wiki/Fermi_coordinates" title="Fermi coordinates">Fermi coordinates</a>.<sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">&#91;</span>81<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-82" class="reference"><a href="#cite_note-82"><span class="cite-bracket">&#91;</span>82<span class="cite-bracket">&#93;</span></a></sup> This is developed further in 1932 by Arthur Walker into the <a href="/wiki/Fermi%E2%80%93Walker_transport" title="Fermi–Walker transport">Fermi-Walker transport</a>.<sup id="cite_ref-:02_83-0" class="reference"><a href="#cite_note-:02-83"><span class="cite-bracket">&#91;</span>83<span class="cite-bracket">&#93;</span></a></sup></li> <li>1923 – George David Birkhoff proves <a href="/wiki/Birkhoff%27s_theorem_(relativity)" title="Birkhoff&#39;s theorem (relativity)">Birkhoff's theorem</a> on the uniqueness of the Schwarzschild solution.</li> <li>1924 – Arthur Eddington calculates the <a href="/wiki/Eddington_luminosity" title="Eddington luminosity">Eddington limit</a>.<sup id="cite_ref-eddington3_84-0" class="reference"><a href="#cite_note-eddington3-84"><span class="cite-bracket">&#91;</span>84<span class="cite-bracket">&#93;</span></a></sup></li> <li>1924 – <a href="/wiki/Cornelius_Lanczos" title="Cornelius Lanczos">Cornelius Lanczos</a> discovers the <a href="/wiki/Van_Stockum_dust" title="Van Stockum dust">van Stockum dust</a>,<sup id="cite_ref-85" class="reference"><a href="#cite_note-85"><span class="cite-bracket">&#91;</span>85<span class="cite-bracket">&#93;</span></a></sup> later rediscovered by <a href="/wiki/Willem_Jacob_van_Stockum" title="Willem Jacob van Stockum">Willem Jacob van Stockum</a> in 1938.<sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">&#91;</span>86<span class="cite-bracket">&#93;</span></a></sup></li> <li>1925 – <a href="/wiki/Walter_Sydney_Adams" title="Walter Sydney Adams">Walter Adams</a> measures the gravitational redshift of the light emitted by the companion of Sirius B, a <a href="/wiki/White_dwarf" title="White dwarf">white dwarf</a>.<sup id="cite_ref-87" class="reference"><a href="#cite_note-87"><span class="cite-bracket">&#91;</span>87<span class="cite-bracket">&#93;</span></a></sup></li> <li>1927 – <a href="/wiki/Georges_Lema%C3%AEtre" title="Georges Lemaître">Georges Lemaître</a> publishes his hypothesis of the <a href="/wiki/Big_Bang" title="Big Bang">primeval atom</a>.<sup id="cite_ref-88" class="reference"><a href="#cite_note-88"><span class="cite-bracket">&#91;</span>88<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-3" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1929 – <a href="/wiki/Edwin_Hubble" title="Edwin Hubble">Edwin Hubble</a> published the <a href="/wiki/Hubble%27s_Law" class="mw-redirect" title="Hubble&#39;s Law">law later named for him</a>.<sup id="cite_ref-hubble_89-0" class="reference"><a href="#cite_note-hubble-89"><span class="cite-bracket">&#91;</span>89<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1930s">1930s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=9" title="Edit section: 1930s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Einstein_cross_(cropped).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Einstein_cross_%28cropped%29.jpg/220px-Einstein_cross_%28cropped%29.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/54/Einstein_cross_%28cropped%29.jpg/330px-Einstein_cross_%28cropped%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/54/Einstein_cross_%28cropped%29.jpg/440px-Einstein_cross_%28cropped%29.jpg 2x" data-file-width="1600" data-file-height="1600" /></a><figcaption>The <a href="/wiki/Einstein_Cross" title="Einstein Cross">Einstein Cross</a> is an example of gravitational lensing at work. This one was discovered in 1985.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">&#91;</span>90<span class="cite-bracket">&#93;</span></a></sup></figcaption></figure> <ul><li>1931 – <a href="/wiki/Subrahmanyan_Chandrasekhar" title="Subrahmanyan Chandrasekhar">Subrahmanyan Chandrasekhar</a> studies the <a href="/wiki/Chandrasekhar_limit" title="Chandrasekhar limit">stability</a> of <a href="/wiki/White_dwarf" title="White dwarf">white dwarfs</a>.<sup id="cite_ref-chandra3_91-0" class="reference"><a href="#cite_note-chandra3-91"><span class="cite-bracket">&#91;</span>91<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-chandra4_92-0" class="reference"><a href="#cite_note-chandra4-92"><span class="cite-bracket">&#91;</span>92<span class="cite-bracket">&#93;</span></a></sup></li> <li>1931 – Georges Lemaître and Arthur Eddington predict the <a href="/wiki/Expansion_of_the_universe" title="Expansion of the universe">expansion of the Universe</a>.<sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">&#91;</span>93<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-94" class="reference"><a href="#cite_note-94"><span class="cite-bracket">&#91;</span>94<span class="cite-bracket">&#93;</span></a></sup></li> <li>1931 – Albert Einstein introduces his <a href="/wiki/Cosmological_constant" title="Cosmological constant">cosmological constant</a>.<sup id="cite_ref-95" class="reference"><a href="#cite_note-95"><span class="cite-bracket">&#91;</span>95<span class="cite-bracket">&#93;</span></a></sup></li> <li>1932 – Albert Einstein and Willem de Sitter propose the <a href="/wiki/Einstein%E2%80%93de_Sitter_universe" title="Einstein–de Sitter universe">Einstein-de Sitter cosmological model</a>.<sup id="cite_ref-96" class="reference"><a href="#cite_note-96"><span class="cite-bracket">&#91;</span>96<span class="cite-bracket">&#93;</span></a></sup></li> <li>1932 – <a href="/wiki/John_Cockcroft" title="John Cockcroft">John Cockcroft</a> and <a href="/wiki/Ernest_Walton" title="Ernest Walton">Ernest Walton</a> verify Einstein's mass-energy equation by an experiment artificially <a href="/wiki/Nuclear_transmutation" title="Nuclear transmutation">transmuting</a> lithium into helium.<sup id="cite_ref-97" class="reference"><a href="#cite_note-97"><span class="cite-bracket">&#91;</span>97<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">&#91;</span>98<span class="cite-bracket">&#93;</span></a></sup></li> <li>1934 – <a href="/wiki/Dmitry_Blokhintsev" title="Dmitry Blokhintsev">Dmitry Blokhintsev</a> and F. M. Gal'perin coin the term '<a href="/wiki/Graviton" title="Graviton">graviton</a>'.<sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">&#91;</span>99<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Paul_Dirac" title="Paul Dirac">Paul Dirac</a> reintroduces it in 1959.<sup id="cite_ref-100" class="reference"><a href="#cite_note-100"><span class="cite-bracket">&#91;</span>100<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Debnath_101-0" class="reference"><a href="#cite_note-Debnath-101"><span class="cite-bracket">&#91;</span>101<span class="cite-bracket">&#93;</span></a></sup></li> <li>1934 – <a href="/wiki/Walter_Baade" title="Walter Baade">Walter Baade</a> and <a href="/wiki/Fritz_Zwicky" title="Fritz Zwicky">Fritz Zwicky</a> predict the existence of <a href="/wiki/Neutron_star" title="Neutron star">neutron stars</a>.<sup id="cite_ref-102" class="reference"><a href="#cite_note-102"><span class="cite-bracket">&#91;</span>102<span class="cite-bracket">&#93;</span></a></sup> Although their details are wrong, their basic idea is now accepted.<sup id="cite_ref-103" class="reference"><a href="#cite_note-103"><span class="cite-bracket">&#91;</span>103<span class="cite-bracket">&#93;</span></a></sup></li> <li>1935 – Albert Einstein and <a href="/wiki/Nathan_Rosen" title="Nathan Rosen">Nathan Rosen</a> derive the <a href="/wiki/Wormhole" title="Wormhole">Einstein-Rosen bridge</a>, the first wormhole solution.<sup id="cite_ref-ER_104-0" class="reference"><a href="#cite_note-ER-104"><span class="cite-bracket">&#91;</span>104<span class="cite-bracket">&#93;</span></a></sup></li> <li>1935 – <a href="/wiki/Howard_P._Robertson" title="Howard P. Robertson">Howard Robertson</a> and <a href="/wiki/Arthur_Geoffrey_Walker" title="Arthur Geoffrey Walker">Arthur Walker</a> obtain the <a href="/wiki/Robertson-Walker_metric" class="mw-redirect" title="Robertson-Walker metric">Robertson-Walker metric</a>.<sup id="cite_ref-:02_83-1" class="reference"><a href="#cite_note-:02-83"><span class="cite-bracket">&#91;</span>83<span class="cite-bracket">&#93;</span></a></sup></li> <li>1936 – Albert Einstein predicts that a gravitational lens brightens the light coming from a distant object to the observer.<sup id="cite_ref-105" class="reference"><a href="#cite_note-105"><span class="cite-bracket">&#91;</span>105<span class="cite-bracket">&#93;</span></a></sup></li> <li>1937 – Fritz Zwicky states that <a href="/wiki/Galaxy" title="Galaxy">galaxies</a> could act as <a href="/wiki/Gravitational_lens" title="Gravitational lens">gravitational lenses</a>.<sup id="cite_ref-106" class="reference"><a href="#cite_note-106"><span class="cite-bracket">&#91;</span>106<span class="cite-bracket">&#93;</span></a></sup></li> <li>1937 – Albert Einstein and Nathan Rosen obtain the <a href="/wiki/Einstein-Rosen_metric" class="mw-redirect" title="Einstein-Rosen metric">Einstein-Rosen metric</a>, the first exact solution describing gravitational waves.<sup id="cite_ref-107" class="reference"><a href="#cite_note-107"><span class="cite-bracket">&#91;</span>107<span class="cite-bracket">&#93;</span></a></sup></li> <li>1938 – Albert Einstein, Leopold Infeld, and Banesh Hoffmann obtain the <a href="/wiki/Einstein%E2%80%93Infeld%E2%80%93Hoffmann_equations" title="Einstein–Infeld–Hoffmann equations">Einstein-Infeld-Hoffmann equations</a> of motion.<sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">&#91;</span>108<span class="cite-bracket">&#93;</span></a></sup></li> <li>1939 – <a href="/wiki/Hans_Bethe" title="Hans Bethe">Hans Bethe</a> shows that nuclear fusion is responsible for energy production inside stars,<sup id="cite_ref-frs_109-0" class="reference"><a href="#cite_note-frs-109"><span class="cite-bracket">&#91;</span>109<span class="cite-bracket">&#93;</span></a></sup> building upon the <a href="/wiki/Kelvin%E2%80%93Helmholtz_mechanism" title="Kelvin–Helmholtz mechanism">Kelvin–Helmholtz mechanism</a>.</li> <li>1939 – <a href="/wiki/Richard_C._Tolman" title="Richard C. Tolman">Richard Tolman</a> solves the Einstein field equations in the case of a spherical fluid drop.<sup id="cite_ref-110" class="reference"><a href="#cite_note-110"><span class="cite-bracket">&#91;</span>110<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:6_111-0" class="reference"><a href="#cite_note-:6-111"><span class="cite-bracket">&#91;</span>111<span class="cite-bracket">&#93;</span></a></sup></li> <li>1939 – <a href="/wiki/Robert_Serber" title="Robert Serber">Robert Serber</a>, <a href="/wiki/George_Volkoff" title="George Volkoff">George Volkoff</a>, <a href="/wiki/Richard_C._Tolman" title="Richard C. Tolman">Richard Tolman</a>, and J. Robert Oppenheimer study the stability of neutron stars, obtaining the <a href="/wiki/Tolman%E2%80%93Oppenheimer%E2%80%93Volkoff_limit" title="Tolman–Oppenheimer–Volkoff limit">Tolman–Oppenheimer–Volkoff limit</a>.<sup id="cite_ref-112" class="reference"><a href="#cite_note-112"><span class="cite-bracket">&#91;</span>112<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-113" class="reference"><a href="#cite_note-113"><span class="cite-bracket">&#91;</span>113<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:6_111-1" class="reference"><a href="#cite_note-:6-111"><span class="cite-bracket">&#91;</span>111<span class="cite-bracket">&#93;</span></a></sup></li> <li>1939 – <a href="/wiki/J._Robert_Oppenheimer" title="J. Robert Oppenheimer">J. Robert Oppenheimer</a> and <a href="/wiki/Hartland_Snyder" title="Hartland Snyder">Hartland Snyder</a> publish the <a href="/wiki/Oppenheimer%E2%80%93Snyder_model" title="Oppenheimer–Snyder model">Oppenheimer-Snyder model</a> for the continued gravitational contraction of a star.<sup id="cite_ref-114" class="reference"><a href="#cite_note-114"><span class="cite-bracket">&#91;</span>114<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:6_111-2" class="reference"><a href="#cite_note-:6-111"><span class="cite-bracket">&#91;</span>111<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-115" class="reference"><a href="#cite_note-115"><span class="cite-bracket">&#91;</span>115<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1940s">1940s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=10" title="Edit section: 1940s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1948 – <a href="/wiki/Ralph_Alpher" title="Ralph Alpher">Ralph Alpher</a> and <a href="/wiki/Robert_Herman" title="Robert Herman">Robert Herman</a> predict the <a href="/wiki/Cosmic_microwave_background" title="Cosmic microwave background">cosmic microwave background</a>.<sup id="cite_ref-116" class="reference"><a href="#cite_note-116"><span class="cite-bracket">&#91;</span>116<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-117" class="reference"><a href="#cite_note-117"><span class="cite-bracket">&#91;</span>117<span class="cite-bracket">&#93;</span></a></sup></li> <li>1949 – <a href="/wiki/Cornelius_Lanczos" title="Cornelius Lanczos">Cornelius Lanczos</a> introduces the <a href="/wiki/Lanczos_tensor" title="Lanczos tensor">Lanczos potential</a> for the <a href="/wiki/Weyl_tensor" title="Weyl tensor">Weyl tensor</a>.<sup id="cite_ref-Lanczos1949_118-0" class="reference"><a href="#cite_note-Lanczos1949-118"><span class="cite-bracket">&#91;</span>118<span class="cite-bracket">&#93;</span></a></sup></li> <li>1949 – <a href="/wiki/Kurt_G%C3%B6del" title="Kurt Gödel">Kurt Gödel</a> discovers <a href="/wiki/G%C3%B6del_metric" title="Gödel metric">Gödel's solution</a>.<sup id="cite_ref-119" class="reference"><a href="#cite_note-119"><span class="cite-bracket">&#91;</span>119<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1950s">1950s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=11" title="Edit section: 1950s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1953 – <a href="/wiki/P._C._Vaidya" class="mw-redirect" title="P. C. Vaidya">P. C. Vaidya</a> Newtonian time in general relativity, Nature, <b>171</b>, p260.</li> <li>1954 – <a href="/wiki/Suraj_N._Gupta" title="Suraj N. Gupta">Suraj Gupta</a> sketches how to derive the equations of general relativity from quantum field theory for a massless spin-2 particle (the <a href="/wiki/Graviton" title="Graviton">graviton</a>).<sup id="cite_ref-PPS_120-0" class="reference"><a href="#cite_note-PPS-120"><span class="cite-bracket">&#91;</span>120<span class="cite-bracket">&#93;</span></a></sup> His procedure was later carried out by <a href="/wiki/Stanley_Deser" title="Stanley Deser">Stanley Deser</a> in 1970.<sup id="cite_ref-121" class="reference"><a href="#cite_note-121"><span class="cite-bracket">&#91;</span>121<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Preskill_122-0" class="reference"><a href="#cite_note-Preskill-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup></li> <li>1955-56 – <a href="/wiki/Robert_Kraichnan" title="Robert Kraichnan">Robert Kraichnan</a> shows that under the appropriate assumptions, Einstein's field equations of gravitation arise from the <a href="/wiki/Quantum_field_theory" title="Quantum field theory">quantum field theory</a> of a massless spin-2 particle coupled to the stress-energy tensor.<sup id="cite_ref-123" class="reference"><a href="#cite_note-123"><span class="cite-bracket">&#91;</span>123<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-124" class="reference"><a href="#cite_note-124"><span class="cite-bracket">&#91;</span>124<span class="cite-bracket">&#93;</span></a></sup> This follows from his unpublished work as an undergraduate in 1947.<sup id="cite_ref-Preskill_122-1" class="reference"><a href="#cite_note-Preskill-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup></li> <li>1956 – <a href="/wiki/Bruno_Bertotti" title="Bruno Bertotti">Bruno Berlotti</a> develops the <a href="/wiki/Post-Minkowskian_expansion" title="Post-Minkowskian expansion">post-Minkowskian expansion</a>.<sup id="cite_ref-125" class="reference"><a href="#cite_note-125"><span class="cite-bracket">&#91;</span>125<span class="cite-bracket">&#93;</span></a></sup></li> <li>1956 – <a href="/wiki/John_Lighton_Synge" title="John Lighton Synge">John Lighton Synge</a> publishes the first relativity text emphasizing <a href="/wiki/Minkowski_diagram" class="mw-redirect" title="Minkowski diagram">spacetime diagrams</a> and <a href="/w/index.php?title=Geometrical_methods&amp;action=edit&amp;redlink=1" class="new" title="Geometrical methods (page does not exist)">geometrical methods</a>.</li> <li>1957 – <a href="/wiki/Felix_A._E._Pirani" class="mw-redirect" title="Felix A. E. Pirani">Felix A. E. Pirani</a> uses <a href="/wiki/Petrov_classification" title="Petrov classification">Petrov classification</a> to understand <a href="/wiki/Gravitational_radiation" class="mw-redirect" title="Gravitational radiation">gravitational radiation</a>.</li> <li>1957 – <a href="/wiki/Richard_Feynman" title="Richard Feynman">Richard Feynman</a> introduces his <a href="/wiki/Sticky_bead_argument" title="Sticky bead argument">sticky bead argument</a>.<sup id="cite_ref-Preskill_122-2" class="reference"><a href="#cite_note-Preskill-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Feynman_126-0" class="reference"><a href="#cite_note-Feynman-126"><span class="cite-bracket">&#91;</span>126<span class="cite-bracket">&#93;</span></a></sup> He later derives the quadrupole formula in a letter to <a href="/wiki/Victor_Weisskopf" title="Victor Weisskopf">Victor Weisskopf</a> (1961).<sup id="cite_ref-Preskill_122-3" class="reference"><a href="#cite_note-Preskill-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup></li> <li>1957-8 – <a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">John Wheeler</a> discusses the breakdown of classical general relativity near <a href="/wiki/Gravitational_singularity" title="Gravitational singularity">singularities</a> and the need for <a href="/wiki/Quantum_gravity" title="Quantum gravity">quantum gravity</a>.<sup id="cite_ref-:22_42-4" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1958 – <a href="/wiki/David_Finkelstein" title="David Finkelstein">David Finkelstein</a> presents <a href="/wiki/Eddington-Finkelstein_coordinates" class="mw-redirect" title="Eddington-Finkelstein coordinates">a new coordinate system</a> that eliminates the Schwarzschild radius as a singularity.<sup id="cite_ref-127" class="reference"><a href="#cite_note-127"><span class="cite-bracket">&#91;</span>127<span class="cite-bracket">&#93;</span></a></sup></li> <li>1959 – <a href="/wiki/Robert_Pound" title="Robert Pound">Robert Pound</a> and <a href="/wiki/Glen_Rebka" title="Glen Rebka">Glen Rebka</a> propose the <a href="/wiki/Pound%E2%80%93Rebka_experiment" title="Pound–Rebka experiment">Pound–Rebka experiment</a>, first precision test of <a href="/wiki/Gravitational_redshift" title="Gravitational redshift">gravitational redshift</a>. The experiment relies on the <a href="/wiki/M%C3%B6ssbauer_effect" title="Mössbauer effect">Mössbauer effect</a>.<sup id="cite_ref-128" class="reference"><a href="#cite_note-128"><span class="cite-bracket">&#91;</span>128<span class="cite-bracket">&#93;</span></a></sup></li> <li>1959 – Lluís Bel introduces <a href="/wiki/Bel%E2%80%93Robinson_tensor" title="Bel–Robinson tensor">Bel–Robinson tensor</a> and the <a href="/wiki/Bel_decomposition" title="Bel decomposition">Bel decomposition</a> of the <a href="/wiki/Riemann_tensor" class="mw-redirect" title="Riemann tensor">Riemann tensor</a>.</li> <li>1959 – <a href="/wiki/Arthur_Komar" title="Arthur Komar">Arthur Komar</a> introduces the <a href="/wiki/Komar_mass" title="Komar mass">Komar mass</a>.</li> <li>1959 – <a href="/wiki/Richard_Arnowitt" title="Richard Arnowitt">Richard Arnowitt</a>, Stanley Deser and <a href="/wiki/Charles_W._Misner" title="Charles W. Misner">Charles W. Misner</a> developed <a href="/wiki/ADM_formalism" title="ADM formalism">ADM formalism</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="1960s">1960s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=12" title="Edit section: 1960s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1960 – <a href="/wiki/Martin_Kruskal" class="mw-redirect" title="Martin Kruskal">Martin Kruskal</a> and <a href="/wiki/George_Szekeres" title="George Szekeres">George Szekeres</a> independently introduce the <a href="/wiki/Kruskal%E2%80%93Szekeres_coordinates" title="Kruskal–Szekeres coordinates">Kruskal–Szekeres coordinates</a> for the <a href="/wiki/Schwarzschild_vacuum" class="mw-redirect" title="Schwarzschild vacuum">Schwarzschild vacuum</a>.<sup id="cite_ref-129" class="reference"><a href="#cite_note-129"><span class="cite-bracket">&#91;</span>129<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-rsbm_130-0" class="reference"><a href="#cite_note-rsbm-130"><span class="cite-bracket">&#91;</span>130<span class="cite-bracket">&#93;</span></a></sup></li> <li>1960 – John Graves and Dieter Brill study the causal structure of <a href="/wiki/Reissner%E2%80%93Nordstr%C3%B6m_metric" title="Reissner–Nordström metric">an electrically charged black hole</a>.<sup id="cite_ref-131" class="reference"><a href="#cite_note-131"><span class="cite-bracket">&#91;</span>131<span class="cite-bracket">&#93;</span></a></sup></li> <li>1960 – Thomas Matthews and <a href="/wiki/Allan_R._Sandage" class="mw-redirect" title="Allan R. Sandage">Allan R. Sandage</a> associate <a href="/wiki/3C_48" title="3C 48">3C 48</a> with a point-like optical image, show radio source can be at most 15 light minutes in diameter,</li> <li>1960 – <a href="/wiki/Ivor_Robinson_(physicist)" title="Ivor Robinson (physicist)">Ivor M. Robinson</a> and <a href="/wiki/Andrzej_Trautman" title="Andrzej Trautman">Andrzej Trautman</a> discover the Robinson-Trautman <a href="/wiki/Null_dust_solution" title="Null dust solution">null dust solution</a><sup id="cite_ref-RobTrautmanPhysRevL1960_fixthis_132-0" class="reference"><a href="#cite_note-RobTrautmanPhysRevL1960_fixthis-132"><span class="cite-bracket">&#91;</span>132<span class="cite-bracket">&#93;</span></a></sup></li> <li>1960 – Robert Pound and Glen Rebka test the gravitational redshift predicted by the equivalence principle to approximately 1%.<sup id="cite_ref-133" class="reference"><a href="#cite_note-133"><span class="cite-bracket">&#91;</span>133<span class="cite-bracket">&#93;</span></a></sup></li> <li>1961 –<a href="/wiki/Tullio_Regge" title="Tullio Regge">Tullio Regge</a> introduces the <a href="/wiki/Regge_calculus" title="Regge calculus">Regge calculus</a>.<sup id="cite_ref-134" class="reference"><a href="#cite_note-134"><span class="cite-bracket">&#91;</span>134<span class="cite-bracket">&#93;</span></a></sup></li> <li>1961 – <a href="/wiki/Carl_H._Brans" title="Carl H. Brans">Carl H. Brans</a> and <a href="/wiki/Robert_H._Dicke" title="Robert H. Dicke">Robert H. Dicke</a> introduce <a href="/wiki/Brans%E2%80%93Dicke_theory" title="Brans–Dicke theory">Brans–Dicke theory</a>, the first viable alternative theory with a clear physical motivation.<sup id="cite_ref-135" class="reference"><a href="#cite_note-135"><span class="cite-bracket">&#91;</span>135<span class="cite-bracket">&#93;</span></a></sup></li> <li>1961 – <a href="/wiki/Pascual_Jordan" title="Pascual Jordan">Pascual Jordan</a> and <a href="/wiki/J%C3%BCrgen_Ehlers" title="Jürgen Ehlers">Jürgen Ehlers</a> develop the <i>kinematic decomposition</i> of a <a href="/wiki/Timelike_congruence" class="mw-redirect" title="Timelike congruence">timelike congruence</a>,</li> <li>1961 – Robert Dicke, Peter Roll, and R. Krotkov refine the <a href="/wiki/E%C3%B6tv%C3%B6s_experiment" title="Eötvös experiment">Eötvös experiment</a> to an accuracy of 10<sup>−11</sup>.<sup id="cite_ref-136" class="reference"><a href="#cite_note-136"><span class="cite-bracket">&#91;</span>136<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-137" class="reference"><a href="#cite_note-137"><span class="cite-bracket">&#91;</span>137<span class="cite-bracket">&#93;</span></a></sup></li> <li>1962 – John Wheeler and Robert Fuller show that the Einstein-Rosen bridge is unstable.<sup id="cite_ref-138" class="reference"><a href="#cite_note-138"><span class="cite-bracket">&#91;</span>138<span class="cite-bracket">&#93;</span></a></sup></li> <li>1962 – <a href="/wiki/Roger_Penrose" title="Roger Penrose">Roger Penrose</a> and <a href="/wiki/Ezra_T._Newman" title="Ezra T. Newman">Ezra T. Newman</a> introduce the <a href="/wiki/Newman%E2%80%93Penrose_formalism" title="Newman–Penrose formalism">Newman–Penrose formalism</a>.</li> <li>1962 – Ehlers and <a href="/wiki/Wolfgang_Kundt" title="Wolfgang Kundt">Wolfgang Kundt</a> classify the symmetries of <a href="/wiki/Pp-wave_spacetimes" class="mw-redirect" title="Pp-wave spacetimes">Pp-wave spacetimes</a>.</li> <li>1962 –<a href="/wiki/Joshua_N._Goldberg" title="Joshua N. Goldberg">Joshua Goldberg</a> and <a href="/wiki/Rainer_K._Sachs" title="Rainer K. Sachs">Rainer K. Sachs</a> prove the <a href="/wiki/Goldberg%E2%80%93Sachs_theorem" title="Goldberg–Sachs theorem">Goldberg–Sachs theorem</a>.<sup id="cite_ref-original_paper_139-0" class="reference"><a href="#cite_note-original_paper-139"><span class="cite-bracket">&#91;</span>139<span class="cite-bracket">&#93;</span></a></sup></li> <li>1962 – Ehlers introduces <a href="/w/index.php?title=Ehlers_transformation&amp;action=edit&amp;redlink=1" class="new" title="Ehlers transformation (page does not exist)">Ehlers transformations</a>, a new <a href="/w/index.php?title=Solution_generating_method&amp;action=edit&amp;redlink=1" class="new" title="Solution generating method (page does not exist)">solution generating method</a>,</li> <li>1962 – <a href="/wiki/Richard_Arnowitt" title="Richard Arnowitt">Richard Arnowitt</a>, <a href="/wiki/Stanley_Deser" title="Stanley Deser">Stanley Deser</a>, and Charles W. Misner introduce the <a href="/wiki/ADM_formalism" title="ADM formalism">ADM reformulation</a> and <a href="/wiki/Global_hyperbolicity" class="mw-redirect" title="Global hyperbolicity">global hyperbolicity</a>,</li> <li>1962 – Istvan Ozsvath and <a href="/wiki/Englbert_Sch%C3%BCcking" class="mw-redirect" title="Englbert Schücking">Englbert Schücking</a> rediscover the <a href="/wiki/Ozv%C3%A1th-Sch%C3%BCcking_metric" class="mw-redirect" title="Ozváth-Schücking metric">circularly polarized monochromomatic gravitational wave</a>.</li> <li>1962 – <a href="/wiki/Hans_Adolph_Buchdahl" class="mw-redirect" title="Hans Adolph Buchdahl">Hans Adolph Buchdahl</a> discovers <a href="/wiki/Buchdahl%27s_theorem" title="Buchdahl&#39;s theorem">Buchdahl's theorem</a>.</li> <li>1962 – <a href="/wiki/Hermann_Bondi" title="Hermann Bondi">Hermann Bondi</a> introduces <a href="/wiki/Bondi_mass" class="mw-redirect" title="Bondi mass">Bondi mass</a>.</li> <li>1962 – <a href="/wiki/Hermann_Bondi" title="Hermann Bondi">Hermann Bondi</a>, M. G. van der Burg, A. W. Metzner, and <a href="/wiki/Rainer_K._Sachs" title="Rainer K. Sachs">Rainer K. Sachs</a> introduce the <a href="/wiki/Bondi%E2%80%93Metzner%E2%80%93Sachs_group" title="Bondi–Metzner–Sachs group">asymptotic symmetry group</a> of <a href="/wiki/Asymptotically_flat_spacetime" title="Asymptotically flat spacetime">asymptotically flat</a>, Lorentzian spacetimes at null (<i>i.e.</i>, light-like) infinity.</li> <li>1963 – <a href="/wiki/Roy_Kerr" title="Roy Kerr">Roy Kerr</a> discovers the <a href="/wiki/Kerr_metric" title="Kerr metric">Kerr vacuum solution</a> of <a href="/wiki/Einstein%27s_field_equations" class="mw-redirect" title="Einstein&#39;s field equations">Einstein's field equations</a>,<sup id="cite_ref-kerr_1963_140-0" class="reference"><a href="#cite_note-kerr_1963-140"><span class="cite-bracket">&#91;</span>140<span class="cite-bracket">&#93;</span></a></sup></li> <li>1963 – Redshifts of <a href="/wiki/3C_273" title="3C 273">3C 273</a> and other quasars show they are very distant; hence very luminous,</li> <li>1963 – Newman, T. Unti and L.A. Tamburino introduce the <a href="/w/index.php?title=NUT_vacuum_solution&amp;action=edit&amp;redlink=1" class="new" title="NUT vacuum solution (page does not exist)">NUT vacuum solution</a>,</li> <li>1963 – <a href="/wiki/Roger_Penrose" title="Roger Penrose">Roger Penrose</a> introduces <a href="/wiki/Penrose_diagram" title="Penrose diagram">Penrose diagrams</a> and <a href="/w/index.php?title=Penrose_limit&amp;action=edit&amp;redlink=1" class="new" title="Penrose limit (page does not exist)">Penrose limits</a>.<sup id="cite_ref-141" class="reference"><a href="#cite_note-141"><span class="cite-bracket">&#91;</span>141<span class="cite-bracket">&#93;</span></a></sup></li> <li>1963 – <a href="/wiki/Maarten_Schmidt" title="Maarten Schmidt">Maarten Schmidt</a> and <a href="/wiki/Jesse_L._Greenstein" title="Jesse L. Greenstein">Jesse Greenstein</a> discover quasi-stellar objects, later shown to be moving away from Earth due to the expansion of the Universe.<sup id="cite_ref-:22_42-5" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1963 – First <a href="/wiki/Ivor_Robinson_(physicist)#Texas_Symposium_on_Relativistic_Astrophysics" title="Ivor Robinson (physicist)">Texas Symposium on Relativistic Astrophysics</a> held in Dallas, 16–18 December.<sup id="cite_ref-:22_42-6" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1964 – <a href="/wiki/Steven_Weinberg" title="Steven Weinberg">Steven Weinberg</a> shows that a quantum field theory of interacting massless spin-2 particles is Lorentz invariant only if it satisfies the principle of equivalence.<sup id="cite_ref-142" class="reference"><a href="#cite_note-142"><span class="cite-bracket">&#91;</span>142<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-143" class="reference"><a href="#cite_note-143"><span class="cite-bracket">&#91;</span>143<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Preskill_122-4" class="reference"><a href="#cite_note-Preskill-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup></li> <li>1964 – <a href="/wiki/Subrahmanyan_Chandrasekhar" title="Subrahmanyan Chandrasekhar">Subrahmanyan Chandrasekhar</a> determines a stability criterion.<sup id="cite_ref-144" class="reference"><a href="#cite_note-144"><span class="cite-bracket">&#91;</span>144<span class="cite-bracket">&#93;</span></a></sup></li> <li>1964 – R. W. Sharp and Charles Misner introduce the <a href="/w/index.php?title=Misner%E2%80%93Sharp_mass&amp;action=edit&amp;redlink=1" class="new" title="Misner–Sharp mass (page does not exist)">Misner–Sharp mass</a>.</li> <li>1964 – <a href="/wiki/Hong-Yee_Chiu" title="Hong-Yee Chiu">Hong-Yee Chiu</a> coins the term "'<a href="/wiki/Quasar" title="Quasar">quasar</a>" for quasi-stellar radio sources.<sup id="cite_ref-145" class="reference"><a href="#cite_note-145"><span class="cite-bracket">&#91;</span>145<span class="cite-bracket">&#93;</span></a></sup></li> <li>1964 – <a href="/wiki/Sjur_Refsdal" title="Sjur Refsdal">Sjur Refsdal</a> suggests that the Hubble constant could be determined using gravitational lensing.<sup id="cite_ref-146" class="reference"><a href="#cite_note-146"><span class="cite-bracket">&#91;</span>146<span class="cite-bracket">&#93;</span></a></sup></li> <li>1964 – <a href="/wiki/Irwin_Shapiro" class="mw-redirect" title="Irwin Shapiro">Irwin Shapiro</a> predicts a <a href="/wiki/Shapiro_effect" class="mw-redirect" title="Shapiro effect">gravitational time delay</a> of radiation travel as a test of general relativity.<sup id="cite_ref-Shapiro1964_147-0" class="reference"><a href="#cite_note-Shapiro1964-147"><span class="cite-bracket">&#91;</span>147<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-148" class="reference"><a href="#cite_note-148"><span class="cite-bracket">&#91;</span>148<span class="cite-bracket">&#93;</span></a></sup></li> <li>1965 – Roger Penrose proves the first <a href="/wiki/Penrose%E2%80%93Hawking_singularity_theorems" title="Penrose–Hawking singularity theorems">singularity theorem</a>.<sup id="cite_ref-149" class="reference"><a href="#cite_note-149"><span class="cite-bracket">&#91;</span>149<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-7" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1965 – Penrose discovers the structure of the light cones in <a href="/wiki/Gravitational_plane_wave" title="Gravitational plane wave">gravitational plane wave</a> spacetimes.</li> <li>1965 – <a href="/wiki/Ezra_T._Newman" title="Ezra T. Newman">Ezra Newman</a> and others introduce <a href="/wiki/Kerr%E2%80%93Newman_metric" title="Kerr–Newman metric">Kerr-Newman metric</a>.<sup id="cite_ref-150" class="reference"><a href="#cite_note-150"><span class="cite-bracket">&#91;</span>150<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-151" class="reference"><a href="#cite_note-151"><span class="cite-bracket">&#91;</span>151<span class="cite-bracket">&#93;</span></a></sup></li> <li>1965 – <a href="/wiki/Arno_Penzias" class="mw-redirect" title="Arno Penzias">Arno Penzias</a> and <a href="/wiki/Robert_Woodrow_Wilson" title="Robert Woodrow Wilson">Robert Wilson</a> accidentally discover the <a href="/wiki/Cosmic_microwave_background_radiation" class="mw-redirect" title="Cosmic microwave background radiation">cosmic microwave background radiation</a>.<sup id="cite_ref-152" class="reference"><a href="#cite_note-152"><span class="cite-bracket">&#91;</span>152<span class="cite-bracket">&#93;</span></a></sup> This rules out the <a href="/wiki/Steady-state_model" title="Steady-state model">steady-state model</a> of <a href="/wiki/Fred_Hoyle" title="Fred Hoyle">Fred Hoyle</a> and <a href="/wiki/Jayant_Narlikar" title="Jayant Narlikar">Jayant Narlikar</a>.<sup id="cite_ref-:22_42-8" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1965 – <a href="/wiki/Joseph_Weber" title="Joseph Weber">Joseph Weber</a> puts the first Weber bar <a href="/wiki/Gravitational_wave" title="Gravitational wave">gravitational wave</a> detector into operation.</li> <li>1966 – Sachs and <a href="/wiki/Ronald_Kantowski" title="Ronald Kantowski">Ronald Kantowski</a> discover the <a href="/w/index.php?title=Kantowski-Sachs_dust_solution&amp;action=edit&amp;redlink=1" class="new" title="Kantowski-Sachs dust solution (page does not exist)">Kantowski-Sachs dust solution</a>.</li> <li>1967 – John Archibald Wheeler popularizes "black hole" at a conference.<sup id="cite_ref-:6_111-3" class="reference"><a href="#cite_note-:6-111"><span class="cite-bracket">&#91;</span>111<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-153" class="reference"><a href="#cite_note-153"><span class="cite-bracket">&#91;</span>153<span class="cite-bracket">&#93;</span></a></sup></li> <li>1967 – <a href="/wiki/Jocelyn_Bell" class="mw-redirect" title="Jocelyn Bell">Jocelyn Bell</a> and <a href="/wiki/Antony_Hewish" title="Antony Hewish">Antony Hewish</a> discover <a href="/wiki/Pulsars" class="mw-redirect" title="Pulsars">pulsars</a>.<sup id="cite_ref-:1_154-0" class="reference"><a href="#cite_note-:1-154"><span class="cite-bracket">&#91;</span>154<span class="cite-bracket">&#93;</span></a></sup></li> <li>1967 – <a href="/w/index.php?title=Robert_H._Boyer&amp;action=edit&amp;redlink=1" class="new" title="Robert H. Boyer (page does not exist)">Robert H. Boyer</a> and <a href="/w/index.php?title=R._W._Lindquist&amp;action=edit&amp;redlink=1" class="new" title="R. W. Lindquist (page does not exist)">R. W. Lindquist</a> introduce <a href="/wiki/Boyer%E2%80%93Lindquist_coordinates" title="Boyer–Lindquist coordinates">Boyer–Lindquist coordinates</a> for the Kerr vacuum.</li> <li>1967 – <a href="/wiki/Bryce_DeWitt" title="Bryce DeWitt">Bryce DeWitt</a> publishes on canonical quantum gravity.<sup id="cite_ref-155" class="reference"><a href="#cite_note-155"><span class="cite-bracket">&#91;</span>155<span class="cite-bracket">&#93;</span></a></sup></li> <li>1967 – <a href="/wiki/Werner_Israel" title="Werner Israel">Werner Israel</a> proves a special case of the <a href="/wiki/No-hair_theorem" title="No-hair theorem">no-hair theorem</a> and the converse of Birkhoff's theorem.<sup id="cite_ref-156" class="reference"><a href="#cite_note-156"><span class="cite-bracket">&#91;</span>156<span class="cite-bracket">&#93;</span></a></sup></li> <li>1967 – <a href="/wiki/Kenneth_Nordtvedt" title="Kenneth Nordtvedt">Kenneth Nordtvedt</a> develops <a href="/wiki/PPN_formalism" class="mw-redirect" title="PPN formalism">PPN formalism</a>.</li> <li>1967 – <a href="/wiki/Mendel_Sachs" title="Mendel Sachs">Mendel Sachs</a> publishes factorization of Einstein's field equations.</li> <li>1967 – <a href="/wiki/Hans_Stephani" title="Hans Stephani">Hans Stephani</a> discovers the <a href="/w/index.php?title=Stephani_dust_solution&amp;action=edit&amp;redlink=1" class="new" title="Stephani dust solution (page does not exist)">Stephani dust solution</a>.</li> <li>1968 – <a href="/w/index.php?title=F._J._Ernst&amp;action=edit&amp;redlink=1" class="new" title="F. J. Ernst (page does not exist)">F. J. Ernst</a> discovers the <a href="/wiki/Ernst_equation" title="Ernst equation">Ernst equation</a>.</li> <li>1968 – <a href="/w/index.php?title=B._Kent_Harrison&amp;action=edit&amp;redlink=1" class="new" title="B. Kent Harrison (page does not exist)">B. Kent Harrison</a> discovers the <a href="/w/index.php?title=Harrison_transformation&amp;action=edit&amp;redlink=1" class="new" title="Harrison transformation (page does not exist)">Harrison transformation</a>, a solution-generating method.</li> <li>1968 – <a href="/wiki/Brandon_Carter" title="Brandon Carter">Brandon Carter</a> solves the geodesic equations for Kerr–Newmann electrovacuum with <a href="/wiki/Carter_constant" title="Carter constant">Carter's constant</a>.<sup id="cite_ref-carter_1968_157-0" class="reference"><a href="#cite_note-carter_1968-157"><span class="cite-bracket">&#91;</span>157<span class="cite-bracket">&#93;</span></a></sup></li> <li>1968 – <a href="/w/index.php?title=Hugo_D._Wahlquist&amp;action=edit&amp;redlink=1" class="new" title="Hugo D. Wahlquist (page does not exist)">Hugo D. Wahlquist</a> discovers the <a href="/wiki/Wahlquist_fluid" title="Wahlquist fluid">Wahlquist fluid</a>.</li> <li>1968 – <a href="/wiki/James_Hartle" title="James Hartle">James Hartle</a> and <a href="/wiki/Kip_Thorne" title="Kip Thorne">Kip Thorne</a> obtain the <a href="/wiki/Hartle%E2%80%93Thorne_metric" title="Hartle–Thorne metric">Hartle–Thorne metric</a>.<sup id="cite_ref-158" class="reference"><a href="#cite_note-158"><span class="cite-bracket">&#91;</span>158<span class="cite-bracket">&#93;</span></a></sup></li> <li>1968 – Irwin Shapiro and his colleagues present the first detection of the Shapiro delay.<sup id="cite_ref-Shapiro1968_159-0" class="reference"><a href="#cite_note-Shapiro1968-159"><span class="cite-bracket">&#91;</span>159<span class="cite-bracket">&#93;</span></a></sup></li> <li>1968 – <a href="/wiki/Kenneth_Nordtvedt" title="Kenneth Nordtvedt">Kenneth Nordtvedt</a> studies <a href="/wiki/Nordtvedt_effect" title="Nordtvedt effect">a possible violation of the weak equivalence principle</a> for self-gravitating bodies and proposes a new test of the weak equivalence principle based on observing the relative motion of the Earth and Moon in the Sun's gravitational field.<sup id="cite_ref-160" class="reference"><a href="#cite_note-160"><span class="cite-bracket">&#91;</span>160<span class="cite-bracket">&#93;</span></a></sup></li> <li>1969 – <a href="/wiki/William_B._Bonnor" title="William B. Bonnor">William B. Bonnor</a> introduces the <a href="/wiki/Bonnor_beam" title="Bonnor beam">Bonnor beam</a>.<sup id="cite_ref-161" class="reference"><a href="#cite_note-161"><span class="cite-bracket">&#91;</span>161<span class="cite-bracket">&#93;</span></a></sup></li> <li>1969 – <a href="/wiki/Joseph_Weber" title="Joseph Weber">Joseph Weber</a> reports observation of <a href="/wiki/Gravitational_waves" class="mw-redirect" title="Gravitational waves">gravitational waves</a><sup id="cite_ref-162" class="reference"><a href="#cite_note-162"><span class="cite-bracket">&#91;</span>162<span class="cite-bracket">&#93;</span></a></sup> a claim now generally discounted.<sup id="cite_ref-Science_Magazine_163-0" class="reference"><a href="#cite_note-Science_Magazine-163"><span class="cite-bracket">&#91;</span>163<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-164" class="reference"><a href="#cite_note-164"><span class="cite-bracket">&#91;</span>164<span class="cite-bracket">&#93;</span></a></sup></li> <li>1969 – Penrose proposes the (weak) <a href="/wiki/Cosmic_censorship_hypothesis" title="Cosmic censorship hypothesis">cosmic censorship hypothesis</a> and the <a href="/wiki/Penrose_process" title="Penrose process">Penrose process</a>,<sup id="cite_ref-165" class="reference"><a href="#cite_note-165"><span class="cite-bracket">&#91;</span>165<span class="cite-bracket">&#93;</span></a></sup></li> <li>1969 – Misner introduces the <a href="/wiki/Mixmaster_universe" title="Mixmaster universe">mixmaster universe</a>.</li> <li>1969 – <a href="/wiki/Yvonne_Choquet-Bruhat" title="Yvonne Choquet-Bruhat">Yvonne Choquet-Bruhat</a> and <a href="/wiki/Robert_Geroch" title="Robert Geroch">Robert Geroch</a> discuss global aspects of the <a href="/wiki/Cauchy_problem" title="Cauchy problem">Cauchy problem</a> in general relativity.<sup id="cite_ref-166" class="reference"><a href="#cite_note-166"><span class="cite-bracket">&#91;</span>166<span class="cite-bracket">&#93;</span></a></sup></li> <li>1965-70 – Subrahmanyan Chandrasekhar and colleagues develops the <a href="/wiki/Post-Newtonian_expansion" title="Post-Newtonian expansion">post-Newtonian expansions</a>.<sup id="cite_ref-167" class="reference"><a href="#cite_note-167"><span class="cite-bracket">&#91;</span>167<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-168" class="reference"><a href="#cite_note-168"><span class="cite-bracket">&#91;</span>168<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-169" class="reference"><a href="#cite_note-169"><span class="cite-bracket">&#91;</span>169<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-170" class="reference"><a href="#cite_note-170"><span class="cite-bracket">&#91;</span>170<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-171" class="reference"><a href="#cite_note-171"><span class="cite-bracket">&#91;</span>171<span class="cite-bracket">&#93;</span></a></sup></li> <li>1968-70 – Roger Penrose, <a href="/wiki/Stephen_Hawking" title="Stephen Hawking">Stephen Hawking</a>, and <a href="/wiki/George_F._R._Ellis" title="George F. R. Ellis">George Ellis</a> prove that singularities must arise in the Big Bang models.<sup id="cite_ref-172" class="reference"><a href="#cite_note-172"><span class="cite-bracket">&#91;</span>172<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-173" class="reference"><a href="#cite_note-173"><span class="cite-bracket">&#91;</span>173<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1970s">1970s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=13" title="Edit section: 1970s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>1970 – <a href="/w/index.php?title=Vladimir_A._Belinski%C7%90&amp;action=edit&amp;redlink=1" class="new" title="Vladimir A. Belinskiǐ (page does not exist)">Vladimir A. Belinskiǐ</a>, <a href="/wiki/Isaak_Markovich_Khalatnikov" class="mw-redirect" title="Isaak Markovich Khalatnikov">Isaak Markovich Khalatnikov</a>, and <a href="/wiki/Evgeny_Lifshitz" title="Evgeny Lifshitz">Evgeny Lifshitz</a> introduce the <a href="/wiki/BKL_conjecture" class="mw-redirect" title="BKL conjecture">BKL conjecture</a>. <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><span><video id="mwe_player_0" poster="//upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Apollo_15_feather_and_hammer_drop.ogv/220px--Apollo_15_feather_and_hammer_drop.ogv.jpg" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="220" height="161" data-durationhint="48" data-mwtitle="Apollo_15_feather_and_hammer_drop.ogv" data-mwprovider="wikimediacommons" resource="/wiki/File:Apollo_15_feather_and_hammer_drop.ogv"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/e/e8/Apollo_15_feather_and_hammer_drop.ogv/Apollo_15_feather_and_hammer_drop.ogv.480p.vp9.webm" type="video/webm; codecs=&quot;vp9, opus&quot;" data-transcodekey="480p.vp9.webm" data-width="654" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/e/e8/Apollo_15_feather_and_hammer_drop.ogv" type="video/ogg; codecs=&quot;theora, vorbis&quot;" data-width="654" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/e/e8/Apollo_15_feather_and_hammer_drop.ogv/Apollo_15_feather_and_hammer_drop.ogv.144p.mjpeg.mov" type="video/quicktime" data-transcodekey="144p.mjpeg.mov" data-width="196" data-height="144" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/e/e8/Apollo_15_feather_and_hammer_drop.ogv/Apollo_15_feather_and_hammer_drop.ogv.240p.vp9.webm" type="video/webm; codecs=&quot;vp9, opus&quot;" data-transcodekey="240p.vp9.webm" data-width="328" data-height="240" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/e/e8/Apollo_15_feather_and_hammer_drop.ogv/Apollo_15_feather_and_hammer_drop.ogv.360p.webm" type="video/webm; codecs=&quot;vp8, vorbis&quot;" data-transcodekey="360p.webm" data-width="490" data-height="360" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/e/e8/Apollo_15_feather_and_hammer_drop.ogv/Apollo_15_feather_and_hammer_drop.ogv.360p.vp9.webm" type="video/webm; codecs=&quot;vp9, opus&quot;" data-transcodekey="360p.vp9.webm" data-width="490" data-height="360" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&amp;title=File%3AApollo_15_feather_and_hammer_drop.ogv&amp;lang=en&amp;trackformat=vtt&amp;origin=%2A" kind="subtitles" type="text/vtt" srclang="en" label="English ‪(en)‬" data-dir="ltr" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&amp;title=File%3AApollo_15_feather_and_hammer_drop.ogv&amp;lang=fr&amp;trackformat=vtt&amp;origin=%2A" kind="subtitles" type="text/vtt" srclang="fr" label="français ‪(fr)‬" data-dir="ltr" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&amp;title=File%3AApollo_15_feather_and_hammer_drop.ogv&amp;lang=pt-br&amp;trackformat=vtt&amp;origin=%2A" kind="subtitles" type="text/vtt" srclang="pt-BR" label="português do Brasil ‪(pt-br)‬" data-dir="ltr" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&amp;title=File%3AApollo_15_feather_and_hammer_drop.ogv&amp;lang=pt&amp;trackformat=vtt&amp;origin=%2A" kind="subtitles" type="text/vtt" srclang="pt" label="português ‪(pt)‬" data-dir="ltr" /><track src="https://commons.wikimedia.org/w/api.php?action=timedtext&amp;title=File%3AApollo_15_feather_and_hammer_drop.ogv&amp;lang=tok&amp;trackformat=vtt&amp;origin=%2A" kind="subtitles" type="text/vtt" srclang="tok" label="toki pona ‪(tok)‬" data-dir="ltr" /></video></span><figcaption>Using a hammer and a feather, Scott validates <a href="/wiki/Galileo" class="mw-redirect" title="Galileo">Galileo</a>'s claim that objects in a vacuum will fall at the same rate.</figcaption></figure></li> <li>1970 – Stephen Hawking and Roger Penrose prove trapped surfaces must arise in black holes.</li> <li>1971 – <a href="/wiki/David_Scott" title="David Scott">David Scott</a> demonstrates that a hammer and a feather fall at the same rate on the Moon.<sup id="cite_ref-:11_3-1" class="reference"><a href="#cite_note-:11-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup></li> <li>1971 – Alfred Goldhaber and Michael Nieto give stringent limits on the photon mass.<sup id="cite_ref-174" class="reference"><a href="#cite_note-174"><span class="cite-bracket">&#91;</span>174<span class="cite-bracket">&#93;</span></a></sup> The strictest one is <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle m_{\gamma }\leq 4\times 10^{-51}{\text{kg}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>m</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>&#x03B3;<!-- γ --></mi> </mrow> </msub> <mo>&#x2264;<!-- ≤ --></mo> <mn>4</mn> <mo>&#x00D7;<!-- × --></mo> <msup> <mn>10</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>&#x2212;<!-- − --></mo> <mn>51</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mtext>kg</mtext> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle m_{\gamma }\leq 4\times 10^{-51}{\text{kg}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e9f659db7c0aeaa685717bf67c98a5c98f0cc0dc" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:18.136ex; height:3.343ex;" alt="{\displaystyle m_{\gamma }\leq 4\times 10^{-51}{\text{kg}}}"></span>.<sup id="cite_ref-175" class="reference"><a href="#cite_note-175"><span class="cite-bracket">&#91;</span>175<span class="cite-bracket">&#93;</span></a></sup></li> <li>1971 – Stephen Hawking proves that the area of a black hole can never decrease.<sup id="cite_ref-176" class="reference"><a href="#cite_note-176"><span class="cite-bracket">&#91;</span>176<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-9" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1971 – <a href="/wiki/Peter_C._Aichelburg" title="Peter C. Aichelburg">Peter C. Aichelburg</a> and <a href="/wiki/Roman_U._Sexl" class="mw-redirect" title="Roman U. Sexl">Roman U. Sexl</a> introduce the <a href="/wiki/Aichelburg%E2%80%93Sexl_ultraboost" title="Aichelburg–Sexl ultraboost">Aichelburg–Sexl ultraboost</a>.</li> <li>1971 – Introduction of the <a href="/w/index.php?title=Khan%E2%80%93Penrose_vacuum&amp;action=edit&amp;redlink=1" class="new" title="Khan–Penrose vacuum (page does not exist)">Khan–Penrose vacuum</a>, a simple explicit colliding plane wave spacetime.</li> <li>1971 – <a href="/w/index.php?title=Robert_H._Gowdy&amp;action=edit&amp;redlink=1" class="new" title="Robert H. Gowdy (page does not exist)">Robert H. Gowdy</a> introduces the <a href="/w/index.php?title=Gowdy_vacuum_solutions&amp;action=edit&amp;redlink=1" class="new" title="Gowdy vacuum solutions (page does not exist)">Gowdy vacuum solutions</a> (cosmological models containing circulating gravitational waves).<figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Chandra_image_of_Cygnus_X-1.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Chandra_image_of_Cygnus_X-1.jpg/220px-Chandra_image_of_Cygnus_X-1.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Chandra_image_of_Cygnus_X-1.jpg/330px-Chandra_image_of_Cygnus_X-1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/21/Chandra_image_of_Cygnus_X-1.jpg/440px-Chandra_image_of_Cygnus_X-1.jpg 2x" data-file-width="2400" data-file-height="2400" /></a><figcaption>Image of Cygnus X-1 by the <a href="/wiki/Chandra_X-ray_Observatory" title="Chandra X-ray Observatory">Chandra X-ray Observatory</a> (2009)</figcaption></figure></li> <li>1971 – <a href="/wiki/Cygnus_X-1" title="Cygnus X-1">Cygnus X-1</a>, the first solid black hole candidate, discovered by <a href="/wiki/Uhuru_(satellite)" title="Uhuru (satellite)">Uhuru satellite</a>.<sup id="cite_ref-:22_42-10" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1971 – <a href="/wiki/William_H._Press" title="William H. Press">William H. Press</a> discovers black hole <a href="/wiki/Ringing_(signal)" title="Ringing (signal)">ringing</a> by <a href="/wiki/Numerical_relativity" title="Numerical relativity">numerical simulation</a>.</li> <li>1971 – Harrison and Estabrook algorithm for solving systems of PDEs.</li> <li>1971 – <a href="/wiki/James_W._York" title="James W. York">James W. York</a> introduces <a href="/w/index.php?title=Conformal_method&amp;action=edit&amp;redlink=1" class="new" title="Conformal method (page does not exist)">conformal method</a> generating initial data for ADM initial value formulation.</li> <li>1971 – <a href="/wiki/Robert_Geroch" title="Robert Geroch">Robert Geroch</a> introduces <a href="/wiki/Geroch_group" title="Geroch group">Geroch group</a> and a <a href="/w/index.php?title=Solution_generating_method&amp;action=edit&amp;redlink=1" class="new" title="Solution generating method (page does not exist)">solution generating method</a>.</li> <li>1972 – <a href="/wiki/Jacob_Bekenstein" title="Jacob Bekenstein">Jacob Bekenstein</a> proposes that black holes have a non-decreasing <a href="/wiki/Entropy" title="Entropy">entropy</a> which can be identified with the area.<sup id="cite_ref-177" class="reference"><a href="#cite_note-177"><span class="cite-bracket">&#91;</span>177<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-11" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1972 – Sachs introduces <a href="/wiki/Optical_scalars" title="Optical scalars">optical scalars</a> and proves <a href="/wiki/Peeling_theorem" title="Peeling theorem">peeling theorem</a>.</li> <li>1972 – <a href="/wiki/Rainer_Weiss" title="Rainer Weiss">Rainer Weiss</a> proposes concept of interferometric gravitational wave detector in an unpublished manuscript.<sup id="cite_ref-178" class="reference"><a href="#cite_note-178"><span class="cite-bracket">&#91;</span>178<span class="cite-bracket">&#93;</span></a></sup></li> <li>1972 – <a href="/wiki/Joseph_C._Hafele" title="Joseph C. Hafele">Joseph Hafele</a> and <a href="/wiki/Richard_E._Keating" title="Richard E. Keating">Richard Keating</a> perform the <a href="/wiki/Hafele%E2%80%93Keating_experiment" title="Hafele–Keating experiment">Hafele–Keating experiment</a>.<sup id="cite_ref-paper1_179-0" class="reference"><a href="#cite_note-paper1-179"><span class="cite-bracket">&#91;</span>179<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-paper2_180-0" class="reference"><a href="#cite_note-paper2-180"><span class="cite-bracket">&#91;</span>180<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-New_Scientist_1972_181-0" class="reference"><a href="#cite_note-New_Scientist_1972-181"><span class="cite-bracket">&#91;</span>181<span class="cite-bracket">&#93;</span></a></sup></li> <li>1972 – <a href="/wiki/Richard_H._Price" title="Richard H. Price">Richard H. Price</a> studies <a href="/wiki/Gravitational_collapse" title="Gravitational collapse">gravitational collapse</a> with numerical simulations.</li> <li>1972 – <a href="/wiki/Saul_Teukolsky" title="Saul Teukolsky">Saul Teukolsky</a> derives the <a href="/w/index.php?title=Teukolsky_equation&amp;action=edit&amp;redlink=1" class="new" title="Teukolsky equation (page does not exist)">Teukolsky equation</a>.<sup id="cite_ref-182" class="reference"><a href="#cite_note-182"><span class="cite-bracket">&#91;</span>182<span class="cite-bracket">&#93;</span></a></sup></li> <li>1972 – <a href="/wiki/Yakov_B._Zel%27dovich" class="mw-redirect" title="Yakov B. Zel&#39;dovich">Yakov B. Zel'dovich</a> predicts the transmutation of electromagnetic and gravitational radiation.</li> <li>1972 – Brandon Carter, Stephen Hawking, and <a href="/wiki/James_M._Bardeen" title="James M. Bardeen">James M. Bardeen</a> propose the four <a href="/wiki/Laws_of_black_hole_mechanics" class="mw-redirect" title="Laws of black hole mechanics">laws of black hole mechanics</a>.<sup id="cite_ref-183" class="reference"><a href="#cite_note-183"><span class="cite-bracket">&#91;</span>183<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-12" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1972 – James Bardeen calculates the <a href="/wiki/Shadow" title="Shadow">shadow</a> of a black hole.<sup id="cite_ref-184" class="reference"><a href="#cite_note-184"><span class="cite-bracket">&#91;</span>184<span class="cite-bracket">&#93;</span></a></sup> This was later verified by the Event Horizon Telescope.<sup id="cite_ref-185" class="reference"><a href="#cite_note-185"><span class="cite-bracket">&#91;</span>185<span class="cite-bracket">&#93;</span></a></sup></li> <li>1973 – <a href="/wiki/Charles_W._Misner" title="Charles W. Misner">Charles W. Misner</a>, <a href="/wiki/Kip_S._Thorne" class="mw-redirect" title="Kip S. Thorne">Kip S. Thorne</a> and <a href="/wiki/John_A._Wheeler" class="mw-redirect" title="John A. Wheeler">John A. Wheeler</a> publish the treatise <i><a href="/wiki/Gravitation_(book)" title="Gravitation (book)">Gravitation</a></i>, a textbook that remains in use in the twenty-first century.<sup id="cite_ref-186" class="reference"><a href="#cite_note-186"><span class="cite-bracket">&#91;</span>186<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-187" class="reference"><a href="#cite_note-187"><span class="cite-bracket">&#91;</span>187<span class="cite-bracket">&#93;</span></a></sup></li> <li>1973 – <a href="/wiki/Stephen_W._Hawking" class="mw-redirect" title="Stephen W. Hawking">Stephen W. Hawking</a> and <a href="/wiki/George_Francis_Rayner_Ellis" class="mw-redirect" title="George Francis Rayner Ellis">George Ellis</a> publish the monograph <i><a href="/wiki/The_Large_Scale_Structure_of_Space-Time" class="mw-redirect" title="The Large Scale Structure of Space-Time">The Large Scale Structure of Space-Time</a></i>.<sup id="cite_ref-:22_42-13" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1973 – Robert Geroch introduces the <a href="/wiki/GHP_formalism" title="GHP formalism">GHP formalism</a>.</li> <li>1973 – Homer Ellis obtains the <a href="/wiki/Ellis_drainhole" title="Ellis drainhole">Ellis drainhole</a>,<sup id="cite_ref-ellis12_188-0" class="reference"><a href="#cite_note-ellis12-188"><span class="cite-bracket">&#91;</span>188<span class="cite-bracket">&#93;</span></a></sup> the first traversable wormhole.</li> <li>1974 – <a href="/wiki/Russell_Hulse" class="mw-redirect" title="Russell Hulse">Russell Hulse</a> and <a href="/wiki/Joseph_Hooton_Taylor,_Jr." class="mw-redirect" title="Joseph Hooton Taylor, Jr.">Joseph Hooton Taylor, Jr.</a> discover the <a href="/wiki/PSR_1913%2B16" class="mw-redirect" title="PSR 1913+16">Hulse–Taylor binary pulsar</a>,</li> <li><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:BH-JPL-A%26A1979.jpg" class="mw-file-description"><img alt="Computer simulation of a black hole accretion disk published in 1979 by Jean-Pierre Luminet" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/BH-JPL-A%26A1979.jpg/220px-BH-JPL-A%26A1979.jpg" decoding="async" width="220" height="109" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/26/BH-JPL-A%26A1979.jpg/330px-BH-JPL-A%26A1979.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/26/BH-JPL-A%26A1979.jpg/440px-BH-JPL-A%26A1979.jpg 2x" data-file-width="700" data-file-height="346" /></a><figcaption>Computer simulation of a black hole accretion disk published in 1979 by Jean-Pierre Luminet</figcaption></figure>1974 – <a href="/wiki/James_W._York" title="James W. York">James W. York</a> and Niall Ó Murchadha present the analysis of the initial value formulation and examine the stability of its solutions.</li> <li>1974 – R. O. Hansen introduces <a href="/w/index.php?title=Hansen%E2%80%93Geroch_multipole_moment&amp;action=edit&amp;redlink=1" class="new" title="Hansen–Geroch multipole moment (page does not exist)">Hansen–Geroch multipole moments</a>.</li> <li>1974 – Stephen Hawking discovers <a href="/wiki/Hawking_radiation" title="Hawking radiation">Hawking radiation</a>.<sup id="cite_ref-189" class="reference"><a href="#cite_note-189"><span class="cite-bracket">&#91;</span>189<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-190" class="reference"><a href="#cite_note-190"><span class="cite-bracket">&#91;</span>190<span class="cite-bracket">&#93;</span></a></sup></li> <li>1975 – Stephen Hawking shows that <a href="/wiki/Bekenstein-Hawking_entropy_equation" class="mw-redirect" title="Bekenstein-Hawking entropy equation">the area of a black hole is proportional to its entropy</a>, as previously conjectured by Jacob Bekenstein.<sup id="cite_ref-191" class="reference"><a href="#cite_note-191"><span class="cite-bracket">&#91;</span>191<span class="cite-bracket">&#93;</span></a></sup></li> <li>1975 – Roberto Colella, <a href="/wiki/Albert_Overhauser" title="Albert Overhauser">Albert Overhauser</a>, and Samuel Werner observe the quantum-mechanical phase shift of neutrons due to gravity.<sup id="cite_ref-192" class="reference"><a href="#cite_note-192"><span class="cite-bracket">&#91;</span>192<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Neutron_interferometer" title="Neutron interferometer">Neutron interferometry</a> was later used to test the principle of equivalence.<sup id="cite_ref-193" class="reference"><a href="#cite_note-193"><span class="cite-bracket">&#91;</span>193<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-194" class="reference"><a href="#cite_note-194"><span class="cite-bracket">&#91;</span>194<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-195" class="reference"><a href="#cite_note-195"><span class="cite-bracket">&#91;</span>195<span class="cite-bracket">&#93;</span></a></sup></li> <li>1975 – Chandrasekhar and <a href="/wiki/Steven_Detweiler" title="Steven Detweiler">Steven Detweiler</a> compute the effects of perturbations on a Schwarzschild black hole.<sup id="cite_ref-196" class="reference"><a href="#cite_note-196"><span class="cite-bracket">&#91;</span>196<span class="cite-bracket">&#93;</span></a></sup></li> <li>1975 – Szekeres and D. A. Szafron discover the <a href="/w/index.php?title=Szekeres%E2%80%93Szafron_dust_solutions&amp;action=edit&amp;redlink=1" class="new" title="Szekeres–Szafron dust solutions (page does not exist)">Szekeres–Szafron dust solutions</a>.</li> <li>1976 – Penrose introduces <a href="/w/index.php?title=Penrose_limit&amp;action=edit&amp;redlink=1" class="new" title="Penrose limit (page does not exist)">Penrose limits</a> (every null geodesic in a Lorentzian spacetime behaves like a plane wave),</li> <li>1978 – Penrose introduces the notion of a <i>thunderbolt</i>,</li> <li>1978 – Belinskiǐ and Zakharov show how to solve <a href="/wiki/Einstein%27s_field_equations" class="mw-redirect" title="Einstein&#39;s field equations">Einstein's field equations</a> using the <a href="/wiki/Inverse_scattering_transform" title="Inverse scattering transform">inverse scattering transform</a>; the first <a href="/wiki/Gravitational_soliton" title="Gravitational soliton">gravitational solitons</a>,</li> <li>1979 – <a href="/wiki/Dennis_Walsh" title="Dennis Walsh">Dennis Walsh</a>, <a href="/w/index.php?title=Robert_Carswell_(scientist)&amp;action=edit&amp;redlink=1" class="new" title="Robert Carswell (scientist) (page does not exist)">Robert Carswell</a>, and <a href="/wiki/Ray_Weymann" title="Ray Weymann">Ray Weymann</a> discover the gravitationally lensed <a href="/wiki/Quasar" title="Quasar">quasar</a> <a href="/wiki/Q0957%2B561" class="mw-redirect" title="Q0957+561">Q0957+561</a>.<sup id="cite_ref-197" class="reference"><a href="#cite_note-197"><span class="cite-bracket">&#91;</span>197<span class="cite-bracket">&#93;</span></a></sup></li> <li>1979 – <a href="/wiki/Jean-Pierre_Luminet" title="Jean-Pierre Luminet">Jean-Pierre Luminet</a> creates an image of a black hole with an <a href="/wiki/Accretion_disk" title="Accretion disk">accretion disk</a> using computer simulation.<sup id="cite_ref-198" class="reference"><a href="#cite_note-198"><span class="cite-bracket">&#91;</span>198<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-199" class="reference"><a href="#cite_note-199"><span class="cite-bracket">&#91;</span>199<span class="cite-bracket">&#93;</span></a></sup></li> <li>1979 – Steven Detweiler proposes using <a href="/wiki/Pulsar_timing_array" title="Pulsar timing array">pulsar timing arrays</a> to detect gravitational waves.<sup id="cite_ref-DetweilerPulsarTiming_200-0" class="reference"><a href="#cite_note-DetweilerPulsarTiming-200"><span class="cite-bracket">&#91;</span>200<span class="cite-bracket">&#93;</span></a></sup></li> <li>1979-81 – <a href="/wiki/Richard_Schoen" title="Richard Schoen">Richard Schoen</a> and <a href="/wiki/Shing-Tung_Yau" title="Shing-Tung Yau">Shing-Tung Yau</a> prove the <a href="/wiki/Positive_energy_theorem" title="Positive energy theorem">positive mass theorem</a>.<sup id="cite_ref-201" class="reference"><a href="#cite_note-201"><span class="cite-bracket">&#91;</span>201<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-202" class="reference"><a href="#cite_note-202"><span class="cite-bracket">&#91;</span>202<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Edward_Witten" title="Edward Witten">Edward Witten</a> independently proves the same thing.<sup id="cite_ref-203" class="reference"><a href="#cite_note-203"><span class="cite-bracket">&#91;</span>203<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1980s">1980s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=14" title="Edit section: 1980s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:COBE_cmb_fluctuations.png" class="mw-file-description"><img alt="Variations in the temperature of the cosmic microwave background measured by the COBE satellite." src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a3/COBE_cmb_fluctuations.png/220px-COBE_cmb_fluctuations.png" decoding="async" width="220" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a3/COBE_cmb_fluctuations.png/330px-COBE_cmb_fluctuations.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a3/COBE_cmb_fluctuations.png/440px-COBE_cmb_fluctuations.png 2x" data-file-width="1024" data-file-height="512" /></a><figcaption>Variations in the temperature of the cosmic microwave background measured by the COBE satellite. The plane of the Milky Way Galaxy is horizontal across the middle of each picture.</figcaption></figure> <ul><li>1980 – <a href="/wiki/Vera_Rubin" title="Vera Rubin">Vera Rubin</a> and colleagues study the rotational properties of <a href="/wiki/UGC_2885" title="UGC 2885">UGC 2885</a>, demonstrating the prevalence of dark matter.<sup id="cite_ref-204" class="reference"><a href="#cite_note-204"><span class="cite-bracket">&#91;</span>204<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-205" class="reference"><a href="#cite_note-205"><span class="cite-bracket">&#91;</span>205<span class="cite-bracket">&#93;</span></a></sup></li> <li>1980 – <a href="/wiki/Gravity_Probe_A" title="Gravity Probe A">Gravity Probe A</a> verifies gravitational redshift to approximately 0.007% using a space-born <a href="/wiki/Hydrogen_maser" title="Hydrogen maser">hydrogen maser</a>.<sup id="cite_ref-206" class="reference"><a href="#cite_note-206"><span class="cite-bracket">&#91;</span>206<span class="cite-bracket">&#93;</span></a></sup></li> <li>1980 – James Bardeen explains structure in the Universe using <a href="/wiki/Cosmological_perturbation_theory" title="Cosmological perturbation theory">cosmological perturbation theory</a>.<sup id="cite_ref-207" class="reference"><a href="#cite_note-207"><span class="cite-bracket">&#91;</span>207<span class="cite-bracket">&#93;</span></a></sup></li> <li>1981 – <a href="/wiki/Alan_Guth" title="Alan Guth">Alan Guth</a> proposes <a href="/wiki/Inflation_(cosmology)" class="mw-redirect" title="Inflation (cosmology)">cosmic inflation</a> in order to solve the <a href="/wiki/Flatness_problem" title="Flatness problem">flatness</a> and <a href="/wiki/Horizon_problem" title="Horizon problem">horizon problems</a>.<sup id="cite_ref-208" class="reference"><a href="#cite_note-208"><span class="cite-bracket">&#91;</span>208<span class="cite-bracket">&#93;</span></a></sup></li> <li>1982 – <a href="/wiki/Joseph_Hooton_Taylor,_Jr." class="mw-redirect" title="Joseph Hooton Taylor, Jr.">Joseph Taylor</a> and <a href="/w/index.php?title=Joel_Weisberg&amp;action=edit&amp;redlink=1" class="new" title="Joel Weisberg (page does not exist)">Joel Weisberg</a> show that the rate of energy loss from the binary <a href="/wiki/Pulsar" title="Pulsar">pulsar</a> <a href="/wiki/PSR_B1913%2B16" class="mw-redirect" title="PSR B1913+16">PSR B1913+16</a> agrees with that predicted by the general relativistic <a href="/wiki/Quadrupole_formula" title="Quadrupole formula">quadrupole formula</a> to within 5%.<sup id="cite_ref-tw82_209-0" class="reference"><a href="#cite_note-tw82-209"><span class="cite-bracket">&#91;</span>209<span class="cite-bracket">&#93;</span></a></sup></li> <li>1983 – James Hartle and Stephen Hawking propose the <a href="/wiki/Hartle%E2%80%93Hawking_state" title="Hartle–Hawking state">no-boundary wave function</a> for the Universe.<sup id="cite_ref-210" class="reference"><a href="#cite_note-210"><span class="cite-bracket">&#91;</span>210<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:22_42-14" class="reference"><a href="#cite_note-:22-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup></li> <li>1983-84 – <a href="/wiki/RELIKT-1" title="RELIKT-1">RELIKT-1</a> observes the cosmic microwave background.</li> <li>1986 – Helmut Friedrich proves that the <a href="/wiki/De_Sitter_space" title="De Sitter space">de Sitter spacetime</a> is stable.<sup id="cite_ref-211" class="reference"><a href="#cite_note-211"><span class="cite-bracket">&#91;</span>211<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:0_212-0" class="reference"><a href="#cite_note-:0-212"><span class="cite-bracket">&#91;</span>212<span class="cite-bracket">&#93;</span></a></sup></li> <li>1986 – <a href="/wiki/Bernard_F._Schutz" title="Bernard F. Schutz">Bernard Schutz</a> shows that cosmic distances can be determined using sources of gravitational waves without references to the <a href="/wiki/Cosmic_distance_ladder" title="Cosmic distance ladder">cosmic distance ladder</a>.<sup id="cite_ref-213" class="reference"><a href="#cite_note-213"><span class="cite-bracket">&#91;</span>213<span class="cite-bracket">&#93;</span></a></sup> Standard-siren astronomy is born.</li> <li>1988 – <a href="/wiki/Mike_Morris_(physicist)" title="Mike Morris (physicist)">Mike Morris</a>, Kip Thorne, and <a href="/w/index.php?title=Yurtsever_Ulvi&amp;action=edit&amp;redlink=1" class="new" title="Yurtsever Ulvi (page does not exist)">Yurtsever Ulvi</a> obtain the <a href="/wiki/Morris-Thorne_wormhole" class="mw-redirect" title="Morris-Thorne wormhole">Morris-Thorne wormhole</a>.<sup id="cite_ref-214" class="reference"><a href="#cite_note-214"><span class="cite-bracket">&#91;</span>214<span class="cite-bracket">&#93;</span></a></sup> Morris and Thorne argue for its pedagogical value.<sup id="cite_ref-215" class="reference"><a href="#cite_note-215"><span class="cite-bracket">&#91;</span>215<span class="cite-bracket">&#93;</span></a></sup></li> <li>1989 – <a href="/wiki/Steven_Weinberg" title="Steven Weinberg">Steven Weinberg</a> discusses the <a href="/wiki/Cosmological_constant_problem" title="Cosmological constant problem">cosmological constant problem</a>, the discrepancy between the measured value and those predicted by modern theories of elementary particles.<sup id="cite_ref-216" class="reference"><a href="#cite_note-216"><span class="cite-bracket">&#91;</span>216<span class="cite-bracket">&#93;</span></a></sup></li> <li>1989-93 – The <a href="/wiki/Cosmic_Background_Explorer" title="Cosmic Background Explorer">Cosmic Background Explorer</a> (COBE) identifies anisotropy in the cosmic microwave background.<sup id="cite_ref-217" class="reference"><a href="#cite_note-217"><span class="cite-bracket">&#91;</span>217<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-218" class="reference"><a href="#cite_note-218"><span class="cite-bracket">&#91;</span>218<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="1990s">1990s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=15" title="Edit section: 1990s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:GR2bodyparameterspace.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/GR2bodyparameterspace.png/280px-GR2bodyparameterspace.png" decoding="async" width="280" height="272" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/GR2bodyparameterspace.png/420px-GR2bodyparameterspace.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/GR2bodyparameterspace.png/560px-GR2bodyparameterspace.png 2x" data-file-width="1000" data-file-height="972" /></a><figcaption>Parameter space of various approximation techniques in general relativity</figcaption></figure> <ul><li>1992 – Stephen Hawking states his <a href="/wiki/Chronology_protection_conjecture" title="Chronology protection conjecture">chronology protection conjecture</a>.<sup id="cite_ref-219" class="reference"><a href="#cite_note-219"><span class="cite-bracket">&#91;</span>219<span class="cite-bracket">&#93;</span></a></sup></li> <li>1993 – <a href="/wiki/Demetrios_Christodoulou" title="Demetrios Christodoulou">Demetrios Christodoulou</a> and <a href="/wiki/Sergiu_Klainerman" title="Sergiu Klainerman">Sergiu Klainerman</a> prove the non-linear stability of the <a href="/wiki/Minkowski_space" title="Minkowski space">Minkowski spacetime</a>.<sup id="cite_ref-220" class="reference"><a href="#cite_note-220"><span class="cite-bracket">&#91;</span>220<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:0_212-1" class="reference"><a href="#cite_note-:0-212"><span class="cite-bracket">&#91;</span>212<span class="cite-bracket">&#93;</span></a></sup></li> <li>1995 – John F. Donoghue show that general relativity is a quantum <a href="/wiki/Effective_field_theory" title="Effective field theory">effective field theory</a>.<sup id="cite_ref-221" class="reference"><a href="#cite_note-221"><span class="cite-bracket">&#91;</span>221<span class="cite-bracket">&#93;</span></a></sup> This framework could be used to analyze binary systems observed by gravitational-wave observatories.<sup id="cite_ref-222" class="reference"><a href="#cite_note-222"><span class="cite-bracket">&#91;</span>222<span class="cite-bracket">&#93;</span></a></sup></li> <li>1995 – <a href="/wiki/Hubble_Deep_Field" title="Hubble Deep Field">Hubble Deep Field</a> image taken.<sup id="cite_ref-Hubble_image_223-0" class="reference"><a href="#cite_note-Hubble_image-223"><span class="cite-bracket">&#91;</span>223<span class="cite-bracket">&#93;</span></a></sup> It is a landmark in the study of cosmology.</li> <li>1998 – The first complete <a href="/wiki/Einstein_ring" title="Einstein ring">Einstein ring</a>, <a href="/w/index.php?title=B1938%2B666&amp;action=edit&amp;redlink=1" class="new" title="B1938+666 (page does not exist)">B1938+666</a>, discovered using the Hubble Space Telescope and <a href="/wiki/MERLIN" title="MERLIN">MERLIN</a>.<sup id="cite_ref-Bullseye_224-0" class="reference"><a href="#cite_note-Bullseye-224"><span class="cite-bracket">&#91;</span>224<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-225" class="reference"><a href="#cite_note-225"><span class="cite-bracket">&#91;</span>225<span class="cite-bracket">&#93;</span></a></sup></li> <li>1998-99 – Scientists discover that the expansion of the Universe is <a href="/wiki/Accelerating_expansion_of_the_universe" title="Accelerating expansion of the universe">accelerating</a>.<sup id="cite_ref-226" class="reference"><a href="#cite_note-226"><span class="cite-bracket">&#91;</span>226<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-227" class="reference"><a href="#cite_note-227"><span class="cite-bracket">&#91;</span>227<span class="cite-bracket">&#93;</span></a></sup></li> <li>1999 – <a href="/wiki/Alessandra_Buonanno" title="Alessandra Buonanno">Alessandra Buonanno</a> and <a href="/wiki/Thibault_Damour" title="Thibault Damour">Thibault Damour</a> introduce the <a href="/wiki/Effective_one-body_formalism" title="Effective one-body formalism">effective one-body formalism</a>.<sup id="cite_ref-228" class="reference"><a href="#cite_note-228"><span class="cite-bracket">&#91;</span>228<span class="cite-bracket">&#93;</span></a></sup> This was later used to analyze data collected by gravitational-wave observatories.<sup id="cite_ref-229" class="reference"><a href="#cite_note-229"><span class="cite-bracket">&#91;</span>229<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="2000s">2000s</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=16" title="Edit section: 2000s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>2003 – Arvind Borde, <a href="/wiki/Alan_Guth" title="Alan Guth">Alan Guth</a>, and <a href="/wiki/Alexander_Vilenkin" title="Alexander Vilenkin">Alexander Vilenkin</a> prove the <a href="/wiki/Borde%E2%80%93Guth%E2%80%93Vilenkin_theorem" title="Borde–Guth–Vilenkin theorem">Borde–Guth–Vilenkin theorem</a>.<sup id="cite_ref-230" class="reference"><a href="#cite_note-230"><span class="cite-bracket">&#91;</span>230<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Cosmocurious_231-0" class="reference"><a href="#cite_note-Cosmocurious-231"><span class="cite-bracket">&#91;</span>231<span class="cite-bracket">&#93;</span></a></sup></li> <li>2002 – First data collection of the <a href="/wiki/LIGO" title="LIGO">Laser Interferometer Gravitational-Wave Observatory</a> (LIGO).</li> <li>2002 – James Williams, Slava Turyshev, and Dale Boggs conduct stringent lunar test of violations of the principle of equivalence.<sup id="cite_ref-232" class="reference"><a href="#cite_note-232"><span class="cite-bracket">&#91;</span>232<span class="cite-bracket">&#93;</span></a></sup></li> <li>2005 – Daniel Holz and Scott Hughes coin the term "standard sirens".<sup id="cite_ref-233" class="reference"><a href="#cite_note-233"><span class="cite-bracket">&#91;</span>233<span class="cite-bracket">&#93;</span></a></sup></li> <li>2009 – <a href="/wiki/Gravity_Probe_B" title="Gravity Probe B">Gravity Probe B</a> experiment verifies the geodetic effect to 0.5%.<sup id="cite_ref-234" class="reference"><a href="#cite_note-234"><span class="cite-bracket">&#91;</span>234<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-PRL_235-0" class="reference"><a href="#cite_note-PRL-235"><span class="cite-bracket">&#91;</span>235<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="2010s">2010s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=17" title="Edit section: 2010s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:PIA16874-CobeWmapPlanckComparison-20130321.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/PIA16874-CobeWmapPlanckComparison-20130321.jpg/280px-PIA16874-CobeWmapPlanckComparison-20130321.jpg" decoding="async" width="280" height="156" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/PIA16874-CobeWmapPlanckComparison-20130321.jpg/420px-PIA16874-CobeWmapPlanckComparison-20130321.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/PIA16874-CobeWmapPlanckComparison-20130321.jpg/560px-PIA16874-CobeWmapPlanckComparison-20130321.jpg 2x" data-file-width="3600" data-file-height="2000" /></a><figcaption>Improving cosmological measurements by three different satellites</figcaption></figure> <ul><li>2010 – A team at the U.S. <a href="/wiki/National_Institute_of_Standards_and_Technology" title="National Institute of Standards and Technology">National Institute for Standards and Technology</a> (NIST) verifies relativistic time dilation using optical <a href="/wiki/Atomic_clock" title="Atomic clock">atomic clocks</a>.<sup id="cite_ref-236" class="reference"><a href="#cite_note-236"><span class="cite-bracket">&#91;</span>236<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-237" class="reference"><a href="#cite_note-237"><span class="cite-bracket">&#91;</span>237<span class="cite-bracket">&#93;</span></a></sup></li> <li>2011 – <a href="/wiki/Wilkinson_Microwave_Anisotropy_Probe" title="Wilkinson Microwave Anisotropy Probe">Wilkinson Microwave Anisotropy Probe</a> (WMAP) finds no statistically significant deviations from the <a href="/wiki/Lambda-CDM_model" title="Lambda-CDM model">ΛCDM model</a> of cosmology.<sup id="cite_ref-WMAP_CMB_238-0" class="reference"><a href="#cite_note-WMAP_CMB-238"><span class="cite-bracket">&#91;</span>238<span class="cite-bracket">&#93;</span></a></sup></li> <li>2012 – <a href="/wiki/Hubble_Ultra-Deep_Field" title="Hubble Ultra-Deep Field">Hubble Ultra-Deep Field</a> image released. It was created using data collected by the Hubble Space Telescope between 2003 and 2004.<sup id="cite_ref-xdf_239-0" class="reference"><a href="#cite_note-xdf-239"><span class="cite-bracket">&#91;</span>239<span class="cite-bracket">&#93;</span></a></sup></li> <li>2013 – <a href="/wiki/NuSTAR" title="NuSTAR">NuSTAR</a> and <a href="/wiki/XMM-Newton" title="XMM-Newton">XMM-Newton</a> measure the spin of the <a href="/wiki/Supermassive_black_hole" title="Supermassive black hole">supermassive black hole</a> at the center of the galaxy <a href="/wiki/NGC_1365" title="NGC 1365">NGC 1365</a>.<sup id="cite_ref-240" class="reference"><a href="#cite_note-240"><span class="cite-bracket">&#91;</span>240<span class="cite-bracket">&#93;</span></a></sup></li> <li>2015 – Advanced LIGO reports the first direct detections of gravitational waves, <a href="/wiki/GW150914" class="mw-redirect" title="GW150914">GW150914</a><sup id="cite_ref-241" class="reference"><a href="#cite_note-241"><span class="cite-bracket">&#91;</span>241<span class="cite-bracket">&#93;</span></a></sup> and <a href="/wiki/GW151226" title="GW151226">GW151226</a>,<sup id="cite_ref-PRL-20160615_242-0" class="reference"><a href="#cite_note-PRL-20160615-242"><span class="cite-bracket">&#91;</span>242<span class="cite-bracket">&#93;</span></a></sup> mergers of stellar-mass black holes. <a href="/wiki/Gravitational-wave_astronomy" title="Gravitational-wave astronomy">Gravitational-wave astronomy</a> is born.<sup id="cite_ref-Naeye_243-0" class="reference"><a href="#cite_note-Naeye-243"><span class="cite-bracket">&#91;</span>243<span class="cite-bracket">&#93;</span></a></sup> No deviations from general relativity were found.<sup id="cite_ref-244" class="reference"><a href="#cite_note-244"><span class="cite-bracket">&#91;</span>244<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-MIT_245-0" class="reference"><a href="#cite_note-MIT-245"><span class="cite-bracket">&#91;</span>245<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – <a href="/wiki/LIGO-Virgo_Collaboration" class="mw-redirect" title="LIGO-Virgo Collaboration">LIGO-VIRGO collaboration</a> detects gravitational waves emitted by a neutron-star binary, <a href="/wiki/GW170817" title="GW170817">GW170817</a>.<sup id="cite_ref-:3_246-0" class="reference"><a href="#cite_note-:3-246"><span class="cite-bracket">&#91;</span>246<span class="cite-bracket">&#93;</span></a></sup> The <a href="/wiki/Fermi_Gamma-ray_Space_Telescope" title="Fermi Gamma-ray Space Telescope">Fermi Gamma-ray Space Telescope</a> and the International Gamma-ray Astrophysics Laboratory (<a href="/wiki/INTEGRAL" title="INTEGRAL">INTEGRAL</a>) unambiguously detect the corresponding gamma-ray burst.<sup id="cite_ref-:5_247-0" class="reference"><a href="#cite_note-:5-247"><span class="cite-bracket">&#91;</span>247<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-248" class="reference"><a href="#cite_note-248"><span class="cite-bracket">&#91;</span>248<span class="cite-bracket">&#93;</span></a></sup> LIGO-VIRGO and Fermi constrain the difference between the speed of gravity and the speed of light in vacuum to 10<sup><span class="nowrap"><span data-sort-value="2998850000000000000♠"></span>−15</span></sup>.<sup id="cite_ref-Abbott^3_AJT_249-0" class="reference"><a href="#cite_note-Abbott^3_AJT-249"><span class="cite-bracket">&#91;</span>249<span class="cite-bracket">&#93;</span></a></sup> This marks the first time electromagnetic and gravitational waves are detected from a single source,<sup id="cite_ref-250" class="reference"><a href="#cite_note-250"><span class="cite-bracket">&#91;</span>250<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-251" class="reference"><a href="#cite_note-251"><span class="cite-bracket">&#91;</span>251<span class="cite-bracket">&#93;</span></a></sup> and give direct evidence that some (short) gamma-ray bursts are due to colliding neutron stars.<sup id="cite_ref-:3_246-1" class="reference"><a href="#cite_note-:3-246"><span class="cite-bracket">&#91;</span>246<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:5_247-1" class="reference"><a href="#cite_note-:5-247"><span class="cite-bracket">&#91;</span>247<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – <a href="/wiki/Multi-messenger_astronomy" title="Multi-messenger astronomy">Multi-messenger astronomy</a> reveals neutron-star mergers to be responsible for the <a href="/wiki/Nucleosynthesis" title="Nucleosynthesis">nucleosynthesis</a> of some heavy elements,<sup id="cite_ref-SM-20171016_252-0" class="reference"><a href="#cite_note-SM-20171016-252"><span class="cite-bracket">&#91;</span>252<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-NASA-20171016_253-0" class="reference"><a href="#cite_note-NASA-20171016-253"><span class="cite-bracket">&#91;</span>253<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-254" class="reference"><a href="#cite_note-254"><span class="cite-bracket">&#91;</span>254<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-255" class="reference"><a href="#cite_note-255"><span class="cite-bracket">&#91;</span>255<span class="cite-bracket">&#93;</span></a></sup> such as <a href="/wiki/Strontium" title="Strontium">strontium</a>,<sup id="cite_ref-256" class="reference"><a href="#cite_note-256"><span class="cite-bracket">&#91;</span>256<span class="cite-bracket">&#93;</span></a></sup> via the rapid-neutron capture or <a href="/wiki/R-process" title="R-process">r-process</a>.<sup id="cite_ref-257" class="reference"><a href="#cite_note-257"><span class="cite-bracket">&#91;</span>257<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – <a href="/wiki/MICROSCOPE" title="MICROSCOPE">MICROSCOPE</a> satellite experiment verifies the principle of equivalence to 10<sup><span class="nowrap"><span data-sort-value="2998850000000000000♠"></span>−15</span></sup> in terms of the Eötvös ratio <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \eta }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>&#x03B7;<!-- η --></mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \eta }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e4d701857cf5fbec133eebaf94deadf722537f64" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:1.169ex; height:2.176ex;" alt="{\displaystyle \eta }"></span>.<sup id="cite_ref-Touboul2017_258-0" class="reference"><a href="#cite_note-Touboul2017-258"><span class="cite-bracket">&#91;</span>258<span class="cite-bracket">&#93;</span></a></sup> The final report is published in 2022.<sup id="cite_ref-259" class="reference"><a href="#cite_note-259"><span class="cite-bracket">&#91;</span>259<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-260" class="reference"><a href="#cite_note-260"><span class="cite-bracket">&#91;</span>260<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – Principle of equivalence tested to 10<sup>−9</sup> for atoms in a <a href="/wiki/Coherent_state" title="Coherent state">coherent state</a> of <a href="/wiki/Quantum_superposition" title="Quantum superposition">superposition</a>.<sup id="cite_ref-261" class="reference"><a href="#cite_note-261"><span class="cite-bracket">&#91;</span>261<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – Scientists begin using gravitational-wave sources as "<a href="/wiki/Standard_sirens" class="mw-redirect" title="Standard sirens">standard sirens</a>" to measure the Hubble constant, finding its value to be broadly in line with the best estimates of the time.<sup id="cite_ref-262" class="reference"><a href="#cite_note-262"><span class="cite-bracket">&#91;</span>262<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Nat24471_263-0" class="reference"><a href="#cite_note-Nat24471-263"><span class="cite-bracket">&#91;</span>263<span class="cite-bracket">&#93;</span></a></sup> Refinements of this technique will help resolve <a href="/wiki/Hubble%27s_law#Hubble_tension" title="Hubble&#39;s law">discrepancies</a> between the different methods of measurements.<sup id="cite_ref-NAT-20181017_264-0" class="reference"><a href="#cite_note-NAT-20181017-264"><span class="cite-bracket">&#91;</span>264<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017 – <a href="/wiki/Neutron_Star_Interior_Composition_Explorer" title="Neutron Star Interior Composition Explorer">Neutron Star Interior Composition Explorer</a> (NICER) arrives on the International Space Station.<sup id="cite_ref-:1_154-1" class="reference"><a href="#cite_note-:1-154"><span class="cite-bracket">&#91;</span>154<span class="cite-bracket">&#93;</span></a></sup></li> <li>2017-18 – Georgios Moschidis proves the instability of the <a href="/wiki/Anti-de_Sitter_space" title="Anti-de Sitter space">anti-de Sitter spacetime</a>.<sup id="cite_ref-:0_212-2" class="reference"><a href="#cite_note-:0-212"><span class="cite-bracket">&#91;</span>212<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – Final paper by the <a href="/wiki/Planck_(spacecraft)" title="Planck (spacecraft)">Planck satellite</a> collaboration.<sup id="cite_ref-planck2018_265-0" class="reference"><a href="#cite_note-planck2018-265"><span class="cite-bracket">&#91;</span>265<span class="cite-bracket">&#93;</span></a></sup> Planck operated between 2009 and 2013.</li> <li>2018 – Mihalis Dafermos and Jonathan Luk disprove the strong cosmic censorship hypothesis for the Cauchy horizon of an uncharged, rotating black hole.<sup id="cite_ref-266" class="reference"><a href="#cite_note-266"><span class="cite-bracket">&#91;</span>266<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – <a href="/wiki/European_Southern_Observatory" title="European Southern Observatory">European Southern Observatory</a> (ESO) observes gravitational redshift of radiation emitted by matter orbiting <a href="/wiki/Sagittarius_A*" title="Sagittarius A*">Sagittarius A*</a>, the central supermassive black hole of the Milky Way,<sup id="cite_ref-267" class="reference"><a href="#cite_note-267"><span class="cite-bracket">&#91;</span>267<span class="cite-bracket">&#93;</span></a></sup> and verifies the <a href="/wiki/Innermost_stable_circular_orbit" title="Innermost stable circular orbit">innermost stable circular orbit</a> for that object.<sup id="cite_ref-268" class="reference"><a href="#cite_note-268"><span class="cite-bracket">&#91;</span>268<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – Advanced LIGO-VIRGO collaboration constrains <a href="/wiki/Equations_of_state" class="mw-redirect" title="Equations of state">equations of state</a> for a neutron star using GW170817.<sup id="cite_ref-269" class="reference"><a href="#cite_note-269"><span class="cite-bracket">&#91;</span>269<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-270" class="reference"><a href="#cite_note-270"><span class="cite-bracket">&#91;</span>270<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – Luciano Rezzolla, Elias R. Most, and Lukas R. Weih used gravitational-wave data from GW170817 constrain the possible maximum mass for a neutron star to around 2.17 solar masses.<sup id="cite_ref-Rezzolla2018_271-0" class="reference"><a href="#cite_note-Rezzolla2018-271"><span class="cite-bracket">&#91;</span>271<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – Kris Pardo, Maya Fishbach, Daniel Holz, and David Spergel limit the number of spacetime dimensions through which gravitational waves can propagate to 3 + 1, in line with general relativity and ruling out models that allow for "leakage" to higher dimensions of space.<sup id="cite_ref-arxiv.org_2_272-0" class="reference"><a href="#cite_note-arxiv.org_2-272"><span class="cite-bracket">&#91;</span>272<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-273" class="reference"><a href="#cite_note-273"><span class="cite-bracket">&#91;</span>273<span class="cite-bracket">&#93;</span></a></sup> Analyses of GW170817 have also ruled out many other alternatives to general relativity,<sup id="cite_ref-274" class="reference"><a href="#cite_note-274"><span class="cite-bracket">&#91;</span>274<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-275" class="reference"><a href="#cite_note-275"><span class="cite-bracket">&#91;</span>275<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-276" class="reference"><a href="#cite_note-276"><span class="cite-bracket">&#91;</span>276<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-277" class="reference"><a href="#cite_note-277"><span class="cite-bracket">&#91;</span>277<span class="cite-bracket">&#93;</span></a></sup> and proposals for dark energy.<sup id="cite_ref-Dark_Energy_after_GW_170817_278-0" class="reference"><a href="#cite_note-Dark_Energy_after_GW_170817-278"><span class="cite-bracket">&#91;</span>278<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-279" class="reference"><a href="#cite_note-279"><span class="cite-bracket">&#91;</span>279<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Dark_Energy_After_GW170817:_Dead_En_280-0" class="reference"><a href="#cite_note-Dark_Energy_After_GW170817:_Dead_En-280"><span class="cite-bracket">&#91;</span>280<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-281" class="reference"><a href="#cite_note-281"><span class="cite-bracket">&#91;</span>281<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-282" class="reference"><a href="#cite_note-282"><span class="cite-bracket">&#91;</span>282<span class="cite-bracket">&#93;</span></a></sup></li> <li>2018 – Two different experimental teams report highly precise values of Newton's gravitational constant <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle G}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>G</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle G}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f5f3c8921a3b352de45446a6789b104458c9f90b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.827ex; height:2.176ex;" alt="{\displaystyle G}"></span> that slightly disagree.<sup id="cite_ref-283" class="reference"><a href="#cite_note-283"><span class="cite-bracket">&#91;</span>283<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-284" class="reference"><a href="#cite_note-284"><span class="cite-bracket">&#91;</span>284<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-285" class="reference"><a href="#cite_note-285"><span class="cite-bracket">&#91;</span>285<span class="cite-bracket">&#93;</span></a></sup></li> <li>2019 – <a href="/wiki/Event_Horizon_Telescope" title="Event Horizon Telescope">Event Horizon Telescope</a> (EHT) releases an image of <a href="/wiki/Supermassive_black_hole" title="Supermassive black hole">supermassive black hole</a> <a href="/wiki/Messier_87#Supermassive_black_hole_M87*" title="Messier 87">M87*</a>, and measures its mass and shadow.<sup id="cite_ref-286" class="reference"><a href="#cite_note-286"><span class="cite-bracket">&#91;</span>286<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-287" class="reference"><a href="#cite_note-287"><span class="cite-bracket">&#91;</span>287<span class="cite-bracket">&#93;</span></a></sup> Results are confirmed in 2024.<sup id="cite_ref-288" class="reference"><a href="#cite_note-288"><span class="cite-bracket">&#91;</span>288<span class="cite-bracket">&#93;</span></a></sup></li> <li>2019 – Advanced LIGO and VIRGO detect <a href="/wiki/GW190814" title="GW190814">GW190814</a>, the collision of a 26-solar-mass black hole and a 2.6-solar-mass object, either an extremely heavy neutron star or a very light black hole.<sup id="cite_ref-LIGO-2020_289-0" class="reference"><a href="#cite_note-LIGO-2020-289"><span class="cite-bracket">&#91;</span>289<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-AJL-20200623_290-0" class="reference"><a href="#cite_note-AJL-20200623-290"><span class="cite-bracket">&#91;</span>290<span class="cite-bracket">&#93;</span></a></sup> This is the largest mass gap seen in a gravitational-wave source to-date.</li></ul> <div class="mw-heading mw-heading3"><h3 id="2020s">2020s</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=18" title="Edit section: 2020s"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Eso2208-eht-mwe.tif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Eso2208-eht-mwe.tif/lossy-page1-280px-Eso2208-eht-mwe.tif.jpg" decoding="async" width="280" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Eso2208-eht-mwe.tif/lossy-page1-420px-Eso2208-eht-mwe.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Eso2208-eht-mwe.tif/lossy-page1-560px-Eso2208-eht-mwe.tif.jpg 2x" data-file-width="3701" data-file-height="2163" /></a><figcaption>The size of Sagittarius A* is smaller than the orbit of <a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a>.</figcaption></figure> <ul><li>2020 – Principle of equivalence tested for individual atoms using <a href="/wiki/Atom_interferometer" title="Atom interferometer">atomic interferometry</a> to ~10<sup>−12</sup>.<sup id="cite_ref-291" class="reference"><a href="#cite_note-291"><span class="cite-bracket">&#91;</span>291<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-292" class="reference"><a href="#cite_note-292"><span class="cite-bracket">&#91;</span>292<span class="cite-bracket">&#93;</span></a></sup></li> <li>2020 – ESO observes <a href="/wiki/Apsidal_precession#General_relativity" title="Apsidal precession">Schwarzschild precession</a> of the star <a href="/wiki/S2_(star)" title="S2 (star)">S2</a> about Sagittarius A*.<sup id="cite_ref-293" class="reference"><a href="#cite_note-293"><span class="cite-bracket">&#91;</span>293<span class="cite-bracket">&#93;</span></a></sup></li> <li>2021 – <a href="/wiki/Jun_Ye" title="Jun Ye">Jun Ye</a> and his team measure gravitational redshift with an accuracy of 7.6 × 10<sup>−21</sup> using an <a href="/wiki/Ultracold_atom" title="Ultracold atom">ultracold</a> cloud of 100,000 strontium atoms in an <a href="/wiki/Optical_lattice" title="Optical lattice">optical lattice</a>.<sup id="cite_ref-294" class="reference"><a href="#cite_note-294"><span class="cite-bracket">&#91;</span>294<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-295" class="reference"><a href="#cite_note-295"><span class="cite-bracket">&#91;</span>295<span class="cite-bracket">&#93;</span></a></sup></li> <li>2021 – EHT measures the polarization of the ring of M87*,<sup id="cite_ref-296" class="reference"><a href="#cite_note-296"><span class="cite-bracket">&#91;</span>296<span class="cite-bracket">&#93;</span></a></sup> and other properties of the magnetic field in its vicinity.<sup id="cite_ref-297" class="reference"><a href="#cite_note-297"><span class="cite-bracket">&#91;</span>297<span class="cite-bracket">&#93;</span></a></sup></li> <li>2021 – EHT releases an image of Sagittarius A*,<sup id="cite_ref-AJ-202205_298-0" class="reference"><a href="#cite_note-AJ-202205-298"><span class="cite-bracket">&#91;</span>298<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-NYT-20220512_299-0" class="reference"><a href="#cite_note-NYT-20220512-299"><span class="cite-bracket">&#91;</span>299<span class="cite-bracket">&#93;</span></a></sup> measures its shadow,<sup id="cite_ref-300" class="reference"><a href="#cite_note-300"><span class="cite-bracket">&#91;</span>300<span class="cite-bracket">&#93;</span></a></sup> and shows that it is accurately described by the Kerr metric.<sup id="cite_ref-301" class="reference"><a href="#cite_note-301"><span class="cite-bracket">&#91;</span>301<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-302" class="reference"><a href="#cite_note-302"><span class="cite-bracket">&#91;</span>302<span class="cite-bracket">&#93;</span></a></sup></li> <li>2022 – Chris Overstreet and his team observe the <a href="/wiki/Gravitational_Aharonov-Bohm_effect" title="Gravitational Aharonov-Bohm effect">gravitational Aharonov-Bohm effect</a><sup id="cite_ref-303" class="reference"><a href="#cite_note-303"><span class="cite-bracket">&#91;</span>303<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-304" class="reference"><a href="#cite_note-304"><span class="cite-bracket">&#91;</span>304<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-305" class="reference"><a href="#cite_note-305"><span class="cite-bracket">&#91;</span>305<span class="cite-bracket">&#93;</span></a></sup> using an experimental design from 2012.<sup id="cite_ref-306" class="reference"><a href="#cite_note-306"><span class="cite-bracket">&#91;</span>306<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-307" class="reference"><a href="#cite_note-307"><span class="cite-bracket">&#91;</span>307<span class="cite-bracket">&#93;</span></a></sup></li> <li>2022 – <a href="/wiki/James_Webb_Space_Telescope" title="James Webb Space Telescope">James Webb Space Telescope</a> (JWST) publishes its first image, a <a href="/wiki/Webb%27s_First_Deep_Field" title="Webb&#39;s First Deep Field">deep-field photograph</a> of the <a href="/wiki/SMACS_0723" title="SMACS 0723">SMACS 0723</a> galaxy cluster.<sup id="cite_ref-308" class="reference"><a href="#cite_note-308"><span class="cite-bracket">&#91;</span>308<span class="cite-bracket">&#93;</span></a></sup></li> <li>2022 – <a href="/wiki/Neil_Gehrels_Swift_Observatory" title="Neil Gehrels Swift Observatory">Neil Gehrels Swift Observatory</a> detects <a href="/wiki/GRB_221009A" title="GRB 221009A">GRB 221009A</a>, the brightest gamma-ray burst recorded.<sup id="cite_ref-309" class="reference"><a href="#cite_note-309"><span class="cite-bracket">&#91;</span>309<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-:2_310-0" class="reference"><a href="#cite_note-:2-310"><span class="cite-bracket">&#91;</span>310<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-NASA20221013_311-0" class="reference"><a href="#cite_note-NASA20221013-311"><span class="cite-bracket">&#91;</span>311<span class="cite-bracket">&#93;</span></a></sup></li> <li>2022 – JWST identifies several candidate high-redshift objects, corresponding to just a few hundred million years after the Big Bang.<sup id="cite_ref-MNRAS-20230101_312-0" class="reference"><a href="#cite_note-MNRAS-20230101-312"><span class="cite-bracket">&#91;</span>312<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Yan2023_313-0" class="reference"><a href="#cite_note-Yan2023-313"><span class="cite-bracket">&#91;</span>313<span class="cite-bracket">&#93;</span></a></sup></li> <li>2023 – James Nightingale and colleagues detect <a href="/wiki/Abell_1201_BCG" title="Abell 1201 BCG">Abell 1201</a>, an ultramassive black hole (33 billion solar masses), using strong gravitational lensing.<sup id="cite_ref-314" class="reference"><a href="#cite_note-314"><span class="cite-bracket">&#91;</span>314<span class="cite-bracket">&#93;</span></a></sup></li> <li>2023 – Matteo Bachetti and colleagues confirm that neutron star <a href="/wiki/M82_X-2" title="M82 X-2">M82 X-2</a> is violating the <a href="/wiki/Eddington_luminosity" title="Eddington luminosity">Eddington limit</a>, making it an <a href="/wiki/Ultraluminous_X-ray_source" title="Ultraluminous X-ray source">ultraluminous X-ray source</a> (ULX).<sup id="cite_ref-315" class="reference"><a href="#cite_note-315"><span class="cite-bracket">&#91;</span>315<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-316" class="reference"><a href="#cite_note-316"><span class="cite-bracket">&#91;</span>316<span class="cite-bracket">&#93;</span></a></sup></li> <li>2023 – Team led by Dong Sheng and Zheng-Tian Lu found a <a href="/wiki/Null_result" title="Null result">null result</a> for the coupling between quantum spin and gravity to 10<sup>−9</sup>.<sup id="cite_ref-317" class="reference"><a href="#cite_note-317"><span class="cite-bracket">&#91;</span>317<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-318" class="reference"><a href="#cite_note-318"><span class="cite-bracket">&#91;</span>318<span class="cite-bracket">&#93;</span></a></sup></li> <li>2023 – The <a href="/wiki/North_American_Nanohertz_Observatory_for_Gravitational_Waves" title="North American Nanohertz Observatory for Gravitational Waves">North American Nanohertz Observatory for Gravitational Waves</a> (NANOGrav), the <a href="/wiki/European_Pulsar_Timing_Array" title="European Pulsar Timing Array">European Pulsar Timing Array</a> (EPTA), the <a href="/wiki/Parkes_Observatory" title="Parkes Observatory">Parkes Pulsar Timing Array</a> (Australia), and the <a href="/wiki/Five-hundred-meter_Aperture_Spherical_Telescope" title="Five-hundred-meter Aperture Spherical Telescope">Chinese Pulsar Timing Array</a> report detection of a <a href="/wiki/Gravitational_wave_background" title="Gravitational wave background">gravitational-wave background</a>.<sup id="cite_ref-319" class="reference"><a href="#cite_note-319"><span class="cite-bracket">&#91;</span>319<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-320" class="reference"><a href="#cite_note-320"><span class="cite-bracket">&#91;</span>320<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-321" class="reference"><a href="#cite_note-321"><span class="cite-bracket">&#91;</span>321<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-322" class="reference"><a href="#cite_note-322"><span class="cite-bracket">&#91;</span>322<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-323" class="reference"><a href="#cite_note-323"><span class="cite-bracket">&#91;</span>323<span class="cite-bracket">&#93;</span></a></sup></li> <li>2023 – <a href="/wiki/Geraint_F._Lewis" title="Geraint F. Lewis">Geraint F. Lewis</a> and Brendon Brewer present evidence of cosmological time dilation in quasars.<sup id="cite_ref-324" class="reference"><a href="#cite_note-324"><span class="cite-bracket">&#91;</span>324<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-325" class="reference"><a href="#cite_note-325"><span class="cite-bracket">&#91;</span>325<span class="cite-bracket">&#93;</span></a></sup></li> <li>2024 – The <a href="/wiki/Large_High_Altitude_Air_Shower_Observatory" title="Large High Altitude Air Shower Observatory">Large High Altitude Air Shower Observatory</a> (LHAASO) collaboration imposes stringent limits on violations of <a href="/wiki/Lorentz_invariance" class="mw-redirect" title="Lorentz invariance">Lorentz invariance</a> proposed in certain theories of <a href="/wiki/Quantum_gravity" title="Quantum gravity">quantum gravity</a> using GRB 221009A.<sup id="cite_ref-326" class="reference"><a href="#cite_note-326"><span class="cite-bracket">&#91;</span>326<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-327" class="reference"><a href="#cite_note-327"><span class="cite-bracket">&#91;</span>327<span class="cite-bracket">&#93;</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=19" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output 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class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Timeline_of_gravitational_physics_and_relativity&amp;action=edit&amp;section=20" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-:9-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:9_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:9_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFBauer2015" class="citation book cs1"><a href="/wiki/Susan_Wise_Bauer" title="Susan Wise Bauer">Bauer, Susan Wise</a> (2015). "Chapter Seven: The Last Ancient Astronomer". <i>The Story of Science from the Writings of Aristotle to the Big Bang Theory</i>. New York: W. W. Norton &amp; Company. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-393-24326-0" title="Special:BookSources/978-0-393-24326-0"><bdi>978-0-393-24326-0</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Chapter+Seven%3A+The+Last+Ancient+Astronomer&amp;rft.btitle=The+Story+of+Science+from+the+Writings+of+Aristotle+to+the+Big+Bang+Theory&amp;rft.place=New+York&amp;rft.pub=W.+W.+Norton+%26+Company&amp;rft.date=2015&amp;rft.isbn=978-0-393-24326-0&amp;rft.aulast=Bauer&amp;rft.aufirst=Susan+Wise&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGribbin2003" class="citation book cs1"><a href="/wiki/John_Gribbin" title="John Gribbin">Gribbin, John</a> (2003). "Chapter 3: The First Scientists". <i>The Scientists: A History of Science Told Through the Lives of Its Greatest Inventors</i>. Random House. pp.&#160;76–7. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-1-400-06013-9" title="Special:BookSources/978-1-400-06013-9"><bdi>978-1-400-06013-9</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Chapter+3%3A+The+First+Scientists&amp;rft.btitle=The+Scientists%3A+A+History+of+Science+Told+Through+the+Lives+of+Its+Greatest+Inventors&amp;rft.pages=76-7&amp;rft.pub=Random+House&amp;rft.date=2003&amp;rft.isbn=978-1-400-06013-9&amp;rft.aulast=Gribbin&amp;rft.aufirst=John&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-:11-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-:11_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:11_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPasachoffPasachoff2012" class="citation book cs1">Pasachoff, Naomi; Pasachoff, Jay (2012). "Galileo Galilei". In Robinson, Andrew (ed.). <i>The Scientists: An Epic of Discovery</i>. New York: Thames and Hudson. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-500-25191-1" title="Special:BookSources/978-0-500-25191-1"><bdi>978-0-500-25191-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Galileo+Galilei&amp;rft.btitle=The+Scientists%3A+An+Epic+of+Discovery&amp;rft.place=New+York&amp;rft.pub=Thames+and+Hudson&amp;rft.date=2012&amp;rft.isbn=978-0-500-25191-1&amp;rft.aulast=Pasachoff&amp;rft.aufirst=Naomi&amp;rft.au=Pasachoff%2C+Jay&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-:8-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-:8_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:8_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDolnick2011" class="citation book cs1">Dolnick, Edward (2011). "Timeline". <i>The Clockwork Universe: Isaac Newton, the Royal Society, and the Birth of the Modern World</i>. New York: Harper Collins. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/9780061719516" title="Special:BookSources/9780061719516"><bdi>9780061719516</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Timeline&amp;rft.btitle=The+Clockwork+Universe%3A+Isaac+Newton%2C+the+Royal+Society%2C+and+the+Birth+of+the+Modern+World&amp;rft.place=New+York&amp;rft.pub=Harper+Collins&amp;rft.date=2011&amp;rft.isbn=9780061719516&amp;rft.aulast=Dolnick&amp;rft.aufirst=Edward&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.amnh.org/exhibitions/journey-to-the-stars/educator-resources/stars/olbers-paradox">"Olber's Paradox: Why Is The Sky Dark at Night?"</a>. <i>American Museum of Natural History</i><span class="reference-accessdate">. Retrieved <span class="nowrap">June 6,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=American+Museum+of+Natural+History&amp;rft.atitle=Olber%27s+Paradox%3A+Why+Is+The+Sky+Dark+at+Night%3F&amp;rft_id=https%3A%2F%2Fwww.amnh.org%2Fexhibitions%2Fjourney-to-the-stars%2Feducator-resources%2Fstars%2Folbers-paradox&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBauer2015" class="citation book cs1">Bauer, Susan Wise (2015). "Chapter Ten: The Death of Aristotle". <i>The Story of Science: From the Writings of Aristotle to the Big Bang Theory</i>. New York: W. W. Norton &amp; Company. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-393-24326-0" title="Special:BookSources/978-0-393-24326-0"><bdi>978-0-393-24326-0</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Chapter+Ten%3A+The+Death+of+Aristotle&amp;rft.btitle=The+Story+of+Science%3A+From+the+Writings+of+Aristotle+to+the+Big+Bang+Theory&amp;rft.place=New+York&amp;rft.pub=W.+W.+Norton+%26+Company&amp;rft.date=2015&amp;rft.isbn=978-0-393-24326-0&amp;rft.aulast=Bauer&amp;rft.aufirst=Susan+Wise&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-:10-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-:10_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:10_7-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFIliffe2012" class="citation book cs1">Iliffe, Rob (2012). "Isaac Newton". In Robinson, Andrew (ed.). <i>The Scientists: An Epic of Discovery</i>. New York: Thames and Hudson. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-500-25191-1" title="Special:BookSources/978-0-500-25191-1"><bdi>978-0-500-25191-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Isaac+Newton&amp;rft.btitle=The+Scientists%3A+An+Epic+of+Discovery&amp;rft.place=New+York&amp;rft.pub=Thames+and+Hudson&amp;rft.date=2012&amp;rft.isbn=978-0-500-25191-1&amp;rft.aulast=Iliffe&amp;rft.aufirst=Rob&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGribbin2002" class="citation book cs1">Gribbin, John (2002). "4. Science Finds Its Feet". <i>The Scientists: A History of Science Told Through the Lives of Its Greatest Inventors</i>. New york: Random House. pp.&#160;122–23. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/0-8129-6788-7" title="Special:BookSources/0-8129-6788-7"><bdi>0-8129-6788-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=4.+Science+Finds+Its+Feet&amp;rft.btitle=The+Scientists%3A+A+History+of+Science+Told+Through+the+Lives+of+Its+Greatest+Inventors&amp;rft.place=New+york&amp;rft.pages=122-23&amp;rft.pub=Random+House&amp;rft.date=2002&amp;rft.isbn=0-8129-6788-7&amp;rft.aulast=Gribbin&amp;rft.aufirst=John&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-:7-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-:7_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:7_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNewton1999" class="citation book cs1">Newton, Isaac (1999). <i>The Principia: The Authoritative Translation and Guide</i>. Translated by Cohen, I. Bernard; Whitman, Anne; Budenz, Julia. University of California Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-520-29088-4" title="Special:BookSources/978-0-520-29088-4"><bdi>978-0-520-29088-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+Principia%3A+The+Authoritative+Translation+and+Guide&amp;rft.pub=University+of+California+Press&amp;rft.date=1999&amp;rft.isbn=978-0-520-29088-4&amp;rft.aulast=Newton&amp;rft.aufirst=Isaac&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKleppnerKolenkow1973" class="citation book cs1">Kleppner, Daniel; Kolenkow, Robert J. (1973). "8.4: The Principle of Equivalence". <i>An Introduction to Mechanics</i>. McGraw-Hill. pp.&#160;353–54. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/0-07-035048-5" title="Special:BookSources/0-07-035048-5"><bdi>0-07-035048-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=8.4%3A+The+Principle+of+Equivalence&amp;rft.btitle=An+Introduction+to+Mechanics&amp;rft.pages=353-54&amp;rft.pub=McGraw-Hill&amp;rft.date=1973&amp;rft.isbn=0-07-035048-5&amp;rft.aulast=Kleppner&amp;rft.aufirst=Daniel&amp;rft.au=Kolenkow%2C+Robert+J.&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHalley1705" class="citation book cs1">Halley, Edmund (1705). <a rel="nofollow" class="external text" href="https://archive.org/details/synopsisofastron00hall/page/n3/mode/2up"><i>A synopsis of the astronomy of comets</i></a>. Oxford: John Senex<span class="reference-accessdate">. Retrieved <span class="nowrap">16 June</span> 2020</span> &#8211; via Internet Archive.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=A+synopsis+of+the+astronomy+of+comets&amp;rft.place=Oxford&amp;rft.pub=John+Senex&amp;rft.date=1705&amp;rft.aulast=Halley&amp;rft.aufirst=Edmund&amp;rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsynopsisofastron00hall%2Fpage%2Fn3%2Fmode%2F2up&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSaganDruyan1997" class="citation book cs1">Sagan, Carl; Druyan, Ann (1997). <i>Comet</i>. New York: Random House. pp.&#160;66–67. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-3078-0105-0" title="Special:BookSources/978-0-3078-0105-0"><bdi>978-0-3078-0105-0</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Comet&amp;rft.place=New+York&amp;rft.pages=66-67&amp;rft.pub=Random+House&amp;rft.date=1997&amp;rft.isbn=978-0-3078-0105-0&amp;rft.aulast=Sagan&amp;rft.aufirst=Carl&amp;rft.au=Druyan%2C+Ann&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-treatiselat-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-treatiselat_13-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=ewhgAAAAcAAJ"><i>De mundi systemate</i></a>, Isaac Newton, London: J. Tonson, J. Osborn, &amp; T. Longman, 1728.</span> </li> <li id="cite_note-cohen2004-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-cohen2004_14-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNewtonCohen2004" class="citation book cs1">Newton, Isaac; Cohen, I. Bernard (2004-01-01). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=UvyPx-DwnrAC"><i>A Treatise of the System of the World</i></a>. Courier Corporation. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-486-43880-1" title="Special:BookSources/978-0-486-43880-1"><bdi>978-0-486-43880-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=A+Treatise+of+the+System+of+the+World&amp;rft.pub=Courier+Corporation&amp;rft.date=2004-01-01&amp;rft.isbn=978-0-486-43880-1&amp;rft.aulast=Newton&amp;rft.aufirst=Isaac&amp;rft.au=Cohen%2C+I.+Bernard&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DUvyPx-DwnrAC&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text">Maclaurin, Colin. A Treatise of Fluxions: In Two Books. 1. Vol. 1. Ruddimans, 1742.</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFChandrasekhar1969" class="citation book cs1">Chandrasekhar, Subrahmanyan (1969). "5: The Maclaurin Spheroids". <i>Ellipsoidal Figures of Equilibrium</i>. New Haven: Yale University Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-0-30001-116-6" title="Special:BookSources/978-0-30001-116-6"><bdi>978-0-30001-116-6</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=5%3A+The+Maclaurin+Spheroids&amp;rft.btitle=Ellipsoidal+Figures+of+Equilibrium&amp;rft.place=New+Haven&amp;rft.pub=Yale+University+Press&amp;rft.date=1969&amp;rft.isbn=978-0-30001-116-6&amp;rft.aulast=Chandrasekhar&amp;rft.aufirst=Subrahmanyan&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-Woolfson1993-17"><span class="mw-cite-backlink">^ <a href="#cite_ref-Woolfson1993_17-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Woolfson1993_17-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWoolfson1993" class="citation journal cs1">Woolfson, M.M. (1993). "Solar System&#160;– its origin and evolution". <i>Q. J. R. Astron. Soc</i>. <b>34</b>: 1–20. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1993QJRAS..34....1W">1993QJRAS..34....1W</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Q.+J.+R.+Astron.+Soc.&amp;rft.atitle=Solar+System+%E2%80%93+its+origin+and+evolution&amp;rft.volume=34&amp;rft.pages=1-20&amp;rft.date=1993&amp;rft_id=info%3Abibcode%2F1993QJRAS..34....1W&amp;rft.aulast=Woolfson&amp;rft.aufirst=M.M.&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span> For details of Kant's position, see Stephen Palmquist, "Kant's Cosmogony Re-Evaluated", <i>Studies in History and Philosophy of Science</i> 18:3 (September 1987), pp.255–269.</span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKoonLoMarsdenRoss2006" class="citation book cs1">Koon, W. S.; Lo, M. W.; Marsden, J. E.; Ross, S. D. (2006). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080527145955/http://www.cds.caltech.edu/~marsden/books/Mission_Design.html"><i>Dynamical Systems, the Three-Body Problem, and Space Mission Design</i></a>. p.&#160;9. Archived from <a rel="nofollow" class="external text" href="http://www.cds.caltech.edu/~marsden/books/Mission_Design.html">the original</a> on 2008-05-27<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-06-09</span></span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Dynamical+Systems%2C+the+Three-Body+Problem%2C+and+Space+Mission+Design&amp;rft.pages=9&amp;rft.date=2006&amp;rft.aulast=Koon&amp;rft.aufirst=W.+S.&amp;rft.au=Lo%2C+M.+W.&amp;rft.au=Marsden%2C+J.+E.&amp;rft.au=Ross%2C+S.+D.&amp;rft_id=http%3A%2F%2Fwww.cds.caltech.edu%2F~marsden%2Fbooks%2FMission_Design.html&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span> (16MB)</span> </li> <li id="cite_note-E327-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-E327_19-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFEuler1765" class="citation book cs1"><a href="/wiki/Leonhard_Euler" title="Leonhard Euler">Euler, Leonhard</a> (1765). <a rel="nofollow" class="external text" href="http://www.math.dartmouth.edu/~euler/docs/originals/E327.pdf"><i>De motu rectilineo trium corporum se mutuo attrahentium</i></a> <span class="cs1-format">(PDF)</span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=De+motu+rectilineo+trium+corporum+se+mutuo+attrahentium&amp;rft.date=1765&amp;rft.aulast=Euler&amp;rft.aufirst=Leonhard&amp;rft_id=http%3A%2F%2Fwww.math.dartmouth.edu%2F~euler%2Fdocs%2Foriginals%2FE327.pdf&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-euler_1760-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-euler_1760_20-0">^</a></b></span> <span class="reference-text"><a href="/wiki/Leonhard_Euler" title="Leonhard Euler">Euler L</a>, <i>Nov. Comm. Acad. Imp. Petropolitanae</i>, <b>10</b>, pp. 207–242, <b>11</b>, pp. 152–184; <i>Mémoires de l'Acad. de Berlin</i>, <b>11</b>, 228–249.</span> </li> <li id="cite_note-gallica.bnf.fr2-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-gallica.bnf.fr2_21-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLagrange1867–92" class="citation book cs1 cs1-prop-year-range-abbreviated cs1-prop-foreign-lang-source"><a href="/wiki/Joseph-Louis_Lagrange" title="Joseph-Louis Lagrange">Lagrange, Joseph-Louis</a> (1867–92). <a rel="nofollow" class="external text" href="http://gallica.bnf.fr/ark:/12148/bpt6k229225j/f231.image.r=Oeuvres+de+Lagrange.langFR">"Tome 6, Chapitre II: Essai sur le problème des trois corps"</a>. <i>Œuvres de Lagrange</i> (in French). 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Freeman Company. p.&#160;422. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&#160;<a href="/wiki/Special:BookSources/978-1-4292-1508-4" title="Special:BookSources/978-1-4292-1508-4"><bdi>978-1-4292-1508-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=7.7+Applications+to+Differential+Geometry%2C+Physics%2C+and+Forms+of+Life&amp;rft.btitle=Vector+Calculus&amp;rft.place=New+York&amp;rft.pages=422&amp;rft.edition=6th&amp;rft.pub=W.+H.+Freeman+Company&amp;rft.date=2012&amp;rft.isbn=978-1-4292-1508-4&amp;rft.aulast=Marsden&amp;rft.aufirst=Jerrold&amp;rft.au=Tromba%2C+Anthony&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-60"><span class="mw-cite-backlink"><b><a href="#cite_ref-60">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSchwarzschild1916" class="citation journal cs1">Schwarzschild, Karl (1916). <a class="external text" href="https://en.wikisource.org/wiki/de:%C3%9Cber_das_Gravitationsfeld_eines_Massenpunktes_nach_der_Einsteinschen_Theorie">"Über das Gravitationsfeld eines Massenpunktes nach der Einstein'schen Theorie"</a> &#91;On the Gravitational Field of a Point Mass According to Einstein's Theory&#93;. <i>Sitzungsberichte der Königlich-Preussischen Akademie der Wissenschaften</i>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Sitzungsberichte+der+K%C3%B6niglich-Preussischen+Akademie+der+Wissenschaften&amp;rft.atitle=%C3%9Cber+das+Gravitationsfeld+eines+Massenpunktes+nach+der+Einstein%27schen+Theorie.&amp;rft.date=1916&amp;rft.aulast=Schwarzschild&amp;rft.aufirst=Karl&amp;rft_id=https%3A%2F%2Fen.wikisource.org%2Fwiki%2Fde%3A%25C3%259Cber_das_Gravitationsfeld_eines_Massenpunktes_nach_der_Einsteinschen_Theorie&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-61"><span class="mw-cite-backlink"><b><a href="#cite_ref-61">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSchwarzschild1916" class="citation journal cs1">Schwarzschild, Karl (1916). "Über das Gravitationsfeld einer Kugel aus inkompressibler Flüssigkeit" &#91;On the Gravitational Field of a Sphere of Incompressible Fluid&#93;. <i>Sitzungsberichte der Königlich-Preussischen Akademie der Wissenschaften</i>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Sitzungsberichte+der+K%C3%B6niglich-Preussischen+Akademie+der+Wissenschaften&amp;rft.atitle=%C3%9Cber+das+Gravitationsfeld+einer+Kugel+aus+inkompressibler+Fl%C3%BCssigkeit&amp;rft.date=1916&amp;rft.aulast=Schwarzschild&amp;rft.aufirst=Karl&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-Levy-62"><span class="mw-cite-backlink"><b><a href="#cite_ref-Levy_62-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLevy2021" class="citation journal cs1">Levy, Adam (January 11, 2021). <a rel="nofollow" class="external text" href="https://knowablemagazine.org/article/physical-world/2021/how-black-holes-morphed-theory-reality">"How black holes morphed from theory to reality"</a>. <i>Knowable Magazine</i>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1146%2Fknowable-010921-1">10.1146/knowable-010921-1</a></span><span class="reference-accessdate">. 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"Photons and gravitons in S-matrix theory: derivation of charge conservation and equality of gravitational and inertial mass". <i>Physical Review</i>. <b>135</b> (4B): B1049–B1056. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1964PhRv..135.1049W">1964PhRv..135.1049W</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1103%2FPhysRev.135.B1049">10.1103/PhysRev.135.B1049</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Physical+Review&amp;rft.atitle=Photons+and+gravitons+in+S-matrix+theory%3A+derivation+of+charge+conservation+and+equality+of+gravitational+and+inertial+mass&amp;rft.volume=135&amp;rft.issue=4B&amp;rft.pages=B1049-B1056&amp;rft.date=1964&amp;rft_id=info%3Adoi%2F10.1103%2FPhysRev.135.B1049&amp;rft_id=info%3Abibcode%2F1964PhRv..135.1049W&amp;rft.aulast=Weinberg&amp;rft.aufirst=Steven&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-144"><span class="mw-cite-backlink"><b><a href="#cite_ref-144">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFChandrasekhar1964" class="citation journal cs1">Chandrasekhar, Subrahmanyan (1964). <a rel="nofollow" class="external text" href="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12.114">"Dynamical instability of gaseous masses approaching the Schwarzschild limit in general relativity"</a>. <i>Physical Review Letters</i>. <b>12</b> (4): 114–116. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1964PhRvL..12..114C">1964PhRvL..12..114C</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1103%2FPhysRevLett.12.114">10.1103/PhysRevLett.12.114</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Physical+Review+Letters&amp;rft.atitle=Dynamical+instability+of+gaseous+masses+approaching+the+Schwarzschild+limit+in+general+relativity&amp;rft.volume=12&amp;rft.issue=4&amp;rft.pages=114-116&amp;rft.date=1964&amp;rft_id=info%3Adoi%2F10.1103%2FPhysRevLett.12.114&amp;rft_id=info%3Abibcode%2F1964PhRvL..12..114C&amp;rft.aulast=Chandrasekhar&amp;rft.aufirst=Subrahmanyan&amp;rft_id=https%3A%2F%2Fjournals.aps.org%2Fprl%2Fabstract%2F10.1103%2FPhysRevLett.12.114&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-145"><span class="mw-cite-backlink"><b><a href="#cite_ref-145">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFChiu1964" class="citation journal cs1">Chiu, Hong-Yee (May 1964). <a rel="nofollow" class="external text" href="https://doi.org/10.1063%2F1.3051610">"Gravitational collapse"</a>. <i>Physics Today</i>. <b>17</b> (5): 21–34. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1964PhT....17e..21C">1964PhT....17e..21C</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1063%2F1.3051610">10.1063/1.3051610</a></span>. <q>So far, the clumsily long name 'quasi-stellar radio sources' is used to describe these objects. Because the nature of these objects is entirely unknown, it is hard to prepare a short, appropriate nomenclature for them so that their essential properties are obvious from their name. For convenience, the abbreviated form 'quasar' will be used throughout this paper.</q></cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Physics+Today&amp;rft.atitle=Gravitational+collapse&amp;rft.volume=17&amp;rft.issue=5&amp;rft.pages=21-34&amp;rft.date=1964-05&amp;rft_id=info%3Adoi%2F10.1063%2F1.3051610&amp;rft_id=info%3Abibcode%2F1964PhT....17e..21C&amp;rft.aulast=Chiu&amp;rft.aufirst=Hong-Yee&amp;rft_id=https%3A%2F%2Fdoi.org%2F10.1063%252F1.3051610&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-146"><span class="mw-cite-backlink"><b><a href="#cite_ref-146">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRefsdal1964" class="citation journal cs1">Refsdal, Sjur (1964). <a rel="nofollow" class="external text" href="https://academic.oup.com/mnras/article/128/4/307/2601707">"On the Possibility of Determining Hubble's Parameter and the Masses of Galaxies from the Gravitational Lens Effect"</a>. <i>Monthly Notices of the Royal Astronomical Society</i>. <b>128</b> (4): 307–310. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnras%2F128.4.307">10.1093/mnras/128.4.307</a></span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&amp;rft.atitle=On+the+Possibility+of+Determining+Hubble%27s+Parameter+and+the+Masses+of+Galaxies+from+the+Gravitational+Lens+Effect&amp;rft.volume=128&amp;rft.issue=4&amp;rft.pages=307-310&amp;rft.date=1964&amp;rft_id=info%3Adoi%2F10.1093%2Fmnras%2F128.4.307&amp;rft.aulast=Refsdal&amp;rft.aufirst=Sjur&amp;rft_id=https%3A%2F%2Facademic.oup.com%2Fmnras%2Farticle%2F128%2F4%2F307%2F2601707&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ATimeline+of+gravitational+physics+and+relativity" class="Z3988"></span></span> </li> <li id="cite_note-Shapiro1964-147"><span class="mw-cite-backlink"><b><a href="#cite_ref-Shapiro1964_147-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFIrwin_I._Shapiro1964" class="citation journal cs1">Irwin I. 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href="/wiki/Template_talk:History_of_physics" title="Template talk:History of physics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:History_of_physics" title="Special:EditPage/Template:History of physics"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="History_of_physics_(timeline)" style="font-size:114%;margin:0 4em"><a href="/wiki/History_of_physics" title="History of physics">History of physics</a> (<a href="/wiki/Timeline_of_fundamental_physics_discoveries" title="Timeline of fundamental physics discoveries">timeline</a>)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Classical_physics" title="Classical physics">Classical physics</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/History_of_astronomy" title="History of astronomy">Astronomy</a> <ul><li><a href="/wiki/Timeline_of_astronomy" title="Timeline of astronomy">timeline</a></li></ul></li> <li><a href="/wiki/History_of_electromagnetic_theory" title="History of electromagnetic theory">Electromagnetism</a> <ul><li><a href="/wiki/Timeline_of_electromagnetism_and_classical_optics" title="Timeline of electromagnetism and classical optics">timeline</a></li> <li><a href="/wiki/History_of_electrical_engineering" title="History of electrical engineering">Electrical engineering</a></li> <li><a href="/wiki/History_of_Maxwell%27s_equations" title="History of Maxwell&#39;s equations">Maxwell's equations</a></li></ul></li> <li><a href="/wiki/History_of_fluid_mechanics" title="History of fluid mechanics">Fluid mechanics</a> <ul><li><a href="/wiki/Timeline_of_fluid_and_continuum_mechanics" title="Timeline of fluid and continuum mechanics">timeline</a></li> <li><a href="/wiki/History_of_aerodynamics" title="History of aerodynamics">Aerodynamics</a></li></ul></li> <li><a href="/wiki/History_of_classical_field_theory" title="History of classical field theory">Field theory</a></li> <li><a href="/wiki/History_of_gravitational_theory" title="History of gravitational theory">Gravitational theory</a> <ul><li><a class="mw-selflink selflink">timeline</a></li></ul></li> <li><a href="/wiki/History_of_materials_science" title="History of materials science">Material science</a> <ul><li><a href="/wiki/Timeline_of_materials_technology" title="Timeline of materials technology">timeline</a></li> <li><a href="/wiki/History_of_metamaterials" title="History of metamaterials">Metamaterials</a></li></ul></li> <li><a href="/wiki/History_of_classical_mechanics" title="History of classical mechanics">Mechanics</a> <ul><li><a href="/wiki/Timeline_of_classical_mechanics" title="Timeline of classical mechanics">timeline</a></li> <li><a href="/wiki/History_of_variational_principles_in_physics" title="History of variational principles in physics">Variational principles</a></li></ul></li> <li><a href="/wiki/History_of_optics" title="History of optics">Optics</a> <ul><li><a href="/wiki/History_of_spectroscopy" title="History of spectroscopy">Spectroscopy</a></li></ul></li> <li><a href="/wiki/History_of_thermodynamics" title="History of thermodynamics">Thermodynamics</a> <ul><li><a href="/wiki/Timeline_of_thermodynamics" title="Timeline of thermodynamics">timeline</a></li> <li><a href="/wiki/History_of_energy" title="History of energy">Energy</a></li> <li><a href="/wiki/History_of_entropy" title="History of entropy">Entropy</a></li> <li><a href="/wiki/History_of_perpetual_motion_machines" title="History of perpetual motion machines">Perpetual motion</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modern_physics" title="Modern physics">Modern physics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Computational physics <ul><li><a href="/wiki/Timeline_of_computational_physics" title="Timeline of computational physics">timeline</a></li></ul></li> <li>Condensed matter <ul><li><a href="/wiki/Timeline_of_condensed_matter_physics" title="Timeline of condensed matter physics">timeline</a></li> <li><a href="/wiki/History_of_superconductivity" title="History of superconductivity">Superconductivity</a></li></ul></li> <li>Cosmology <ul><li><a href="/wiki/Timeline_of_cosmological_theories" title="Timeline of cosmological theories">timeline</a></li> <li><a href="/wiki/History_of_the_Big_Bang_theory" title="History of the Big Bang theory">Big Bang theory</a></li></ul></li> <li><a href="/wiki/History_of_general_relativity" title="History of general relativity">General relativity</a> <ul><li><a href="/wiki/Tests_of_general_relativity" title="Tests of general relativity">tests</a></li></ul></li> <li><a href="/wiki/History_of_geophysics" title="History of geophysics">Geophysics</a></li> <li>Nuclear physics <ul><li><a href="/wiki/Discovery_of_nuclear_fission" title="Discovery of nuclear fission">Fission</a></li> <li><a href="/wiki/History_of_nuclear_fusion" title="History of nuclear fusion">Fusion</a></li> <li><a href="/wiki/History_of_nuclear_power" title="History of nuclear power">Power</a></li> <li><a href="/wiki/History_of_nuclear_weapons" title="History of nuclear weapons">Weapons</a></li></ul></li> <li><a href="/wiki/History_of_quantum_mechanics" title="History of quantum mechanics">Quantum mechanics</a> <ul><li><a href="/wiki/Timeline_of_quantum_mechanics" title="Timeline of quantum mechanics">timeline</a></li> <li><a href="/wiki/History_of_atomic_theory" title="History of atomic theory">Atoms</a></li> <li><a href="/wiki/History_of_molecular_theory" title="History of molecular theory">Molecules</a></li> <li><a href="/wiki/History_of_quantum_field_theory" title="History of quantum field theory">Quantum field theory</a></li></ul></li> <li><a href="/wiki/History_of_subatomic_physics" title="History of subatomic physics">Subatomic physics</a> <ul><li><a href="/wiki/Timeline_of_atomic_and_subatomic_physics" title="Timeline of atomic and subatomic physics">timeline</a></li></ul></li> <li><a href="/wiki/History_of_special_relativity" title="History of special relativity">Special relativity</a> <ul><li><a href="/wiki/Timeline_of_special_relativity_and_the_speed_of_light" title="Timeline of special relativity and the speed of light">timeline</a></li> <li><a href="/wiki/History_of_Lorentz_transformations" title="History of Lorentz transformations">Lorentz transformations</a></li> <li><a href="/wiki/Tests_of_special_relativity" title="Tests of special relativity">tests</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Recent developments</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Quantum information <ul><li><a href="/wiki/Timeline_of_quantum_computing_and_communication" title="Timeline of quantum computing and communication">timeline</a></li></ul></li> <li><a href="/wiki/History_of_loop_quantum_gravity" title="History of loop quantum gravity">Loop quantum gravity</a></li> <li><a href="/wiki/History_of_nanotechnology" title="History of nanotechnology">Nanotechnology</a></li> <li><a href="/wiki/History_of_string_theory" title="History of string theory">String theory</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">On specific discoveries</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Discovery_of_cosmic_microwave_background_radiation" title="Discovery of cosmic microwave background radiation">Cosmic microwave background</a></li> <li><a href="/wiki/Discovery_of_graphene" title="Discovery of graphene">Graphene</a></li> <li><a href="/wiki/First_observation_of_gravitational_waves" title="First observation of gravitational waves">Gravitational waves</a></li> <li>Subatomic particles <ul><li><a href="/wiki/Timeline_of_particle_discoveries" title="Timeline of particle discoveries">timeline</a></li> <li><a href="/wiki/Search_for_the_Higgs_boson" title="Search for the Higgs boson">Higgs boson</a></li> <li><a href="/wiki/Discovery_of_the_neutron" title="Discovery of the neutron">Neutron</a></li></ul></li> <li><a href="/wiki/R%C3%B8mer%27s_determination_of_the_speed_of_light" title="Rømer&#39;s determination of the speed of light">Speed of light</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">By periods</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Copernican_Revolution" title="Copernican Revolution">Copernican Revolution</a></li> <li><a href="/wiki/Golden_age_of_physics" title="Golden age of physics">Golden age of physics</a></li> <li><a href="/wiki/Golden_age_of_cosmology" title="Golden age of cosmology">Golden age of cosmology</a></li> <li><a href="/wiki/Physics_in_the_medieval_Islamic_world" title="Physics in the medieval Islamic world">Medieval Islamic world</a> <ul><li><a href="/wiki/Astronomy_in_the_medieval_Islamic_world" title="Astronomy in the medieval Islamic world">Astronomy</a></li></ul></li> <li><a href="/wiki/Noisy_intermediate-scale_quantum_era" title="Noisy intermediate-scale quantum era">Noisy intermediate-scale quantum era</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">By groups</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Harvard_Computers" title="Harvard Computers">Harvard Computers</a></li> <li><a href="/wiki/The_Martians_(scientists)" title="The Martians (scientists)">The Martians</a></li> <li><a href="/wiki/Oxford_Calculators" title="Oxford Calculators">Oxford Calculators</a></li> <li><a href="/wiki/Via_Panisperna_boys" title="Via Panisperna boys">Via Panisperna boys</a></li> <li><a href="/wiki/Women_in_physics" title="Women in physics">Women in physics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientific disputes</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bohr%E2%80%93Einstein_debates" title="Bohr–Einstein debates">Bohr–Einstein</a></li> <li><a href="/wiki/Chandrasekhar%E2%80%93Eddington_dispute" title="Chandrasekhar–Eddington dispute">Chandrasekhar–Eddington</a></li> <li><a href="/wiki/Galileo_affair" title="Galileo affair">Galileo affair</a></li> <li><a href="/wiki/Leibniz%E2%80%93Newton_calculus_controversy" title="Leibniz–Newton calculus controversy">Leibniz–Newton</a></li> <li><a href="/wiki/Mechanical_equivalent_of_heat" title="Mechanical equivalent of heat">Joule–von Mayer</a></li> <li><a href="/wiki/Great_Debate_(astronomy)" title="Great Debate (astronomy)">Shapley–Curtis</a></li> <li>Relativity priority <ul><li><a href="/wiki/Relativity_priority_dispute" title="Relativity priority dispute">Special relativity</a></li> <li><a href="/wiki/General_relativity_priority_dispute" title="General relativity priority dispute">General relativity</a></li></ul></li> <li><a href="/wiki/Transfermium_Wars" title="Transfermium Wars">Transfermium Wars</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" 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