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Please research the article's assertions. Whatever is credible should be sourced, and what is not should be removed. </p> </td></tr></tbody></table> <table class="infobox" cellpadding="1" cellspacing="0" style="float: right; margin: 0 0 0.5em 0.5em; text-align:left; border: 1px solid #E3A857; width:175px;"> <tbody><tr> <td style="font-size: 95%; text-align:center; color:white; background-color:#E3A857"><b>The facts of the matter</b><br /><a href="/wiki/Physics" title="Physics"><font size="5" color="white"><b>Physics</b></font></a> </td></tr> <tr> <td style="background-color:#f0d2a8;" align="center"><a href="/wiki/Category:Physics" title="Category:Physics"><img alt="Physicon.png" src="/w/images/thumb/6/67/Physicon.png/100px-Physicon.png" decoding="async" width="100" height="100" srcset="/w/images/thumb/6/67/Physicon.png/150px-Physicon.png 1.5x, /w/images/6/67/Physicon.png 2x" data-file-width="180" data-file-height="180" /></a> </td></tr> <tr> <td style="font-size: 95%; color:white; background-color:#E3A857; text-align:center;"><b>May the mass times acceleration be with you</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#f0d2a8;"> <ul><li><a href="/wiki/Electromagnetism" title="Electromagnetism">Electromagnetism</a></li> <li><a href="/wiki/Quantum_mechanics" title="Quantum mechanics">Quantum mechanics</a></li> <li><a href="/wiki/Relativity" title="Relativity">Relativity</a></li> <li><a href="/wiki/Thermodynamics" class="mw-redirect" title="Thermodynamics">Thermodynamics</a></li></ul> </td></tr> <tr> <td style="font-size: 95%; color:white; background-color:#E3A857; text-align:center;"><b>Let's get physical!</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#f0d2a8;"> <ul><li><a href="/wiki/Ball_lightning" title="Ball lightning">Ball lightning</a></li> <li><a href="/wiki/Doppler_effect" title="Doppler effect">Doppler effect</a></li> <li><a href="/wiki/Weight" title="Weight">Weight</a></li> <li><a href="/wiki/Mass_(physics)" title="Mass (physics)">Mass (physics)</a></li> <li><a href="/wiki/Subatomic_particle" title="Subatomic particle">Subatomic particle</a></li></ul> </td></tr> <tr> <td style="font-size: 95%; color:white; background-color:#E3A857; text-align:center;"><b>Atoms trying to understand atoms</b> </td></tr> <tr> <td style="font-size: 95%; background-color:#f0d2a8;"> <ul><li><a href="/wiki/Robert_Hooke" title="Robert Hooke">Robert Hooke</a></li> <li><a href="/wiki/Petr_Beckmann" title="Petr Beckmann">Petr Beckmann</a></li> <li><a href="/wiki/Michio_Kaku" title="Michio Kaku">Michio Kaku</a></li> <li><a href="/wiki/Richard_Lindzen" title="Richard Lindzen">Richard Lindzen</a></li> <li><a href="/wiki/Victor_J._Stenger" title="Victor J. Stenger">Victor J. Stenger</a></li></ul> <div class="vte plainlinks" style="font-size:smaller; text-align:center;"><a href="/wiki/Template:Physics" title="Template:Physics">v</a> - <a href="/wiki/Template_talk:Physics" title="Template talk:Physics">t</a> - <a rel="nofollow" class="external text" href="https://rationalwiki.org/w/index.php?title=Template:Physics&action=edit">e</a></div> </td></tr></tbody></table> <p><b>Spacetime</b> is a <a href="/wiki/Mathematics" title="Mathematics">mathematical</a> model in which the three dimensions of space are combined with a fourth dimension of time into a single continuum or a <a href="https://en.wikipedia.org/wiki/vector_space" class="extiw" title="wp:vector space" rel="nofollow"><span style="color:#477979 !important;" title="Wikipedia: vector space">vector space</span></a><sup><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Wikipedia%27s_W.svg/12px-Wikipedia%27s_W.svg.png" decoding="async" width="12" height="12" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Wikipedia%27s_W.svg/18px-Wikipedia%27s_W.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Wikipedia%27s_W.svg/24px-Wikipedia%27s_W.svg.png 2x" data-file-width="128" data-file-height="128" /></sup> called Minkowski space. Doing so enables us to treat space and time in the same way, and thus greatly simplifies a number of theories in physics, especially the <a href="/wiki/Theory_of_relativity" class="mw-redirect" title="Theory of relativity">theory of relativity</a>. </p><p>In classical physics, it was believed that time was a universal constant and thus independent of motion through space. Special relativity demonstrated that time actually varies with motion, since as we approach the <a href="/wiki/Speed_of_light" title="Speed of light">speed of light</a>, our time slows down relative to a stationary observer. General relativity demonstrated that <a href="/wiki/Law_of_Universal_Gravitation" class="mw-redirect" title="Law of Universal Gravitation">gravitational</a> fields can have a similar impact upon time. Both theories can be more simply expressed with the notion of the change in the rate of time as being due to its bending into space. Without treating space and time as part of the same continuum, such a formulation is impossible. </p><p>In relativistic mechanics, the vector space conception of spacetime is hugely helpful in understanding certain predictions of the theory, such as time dilation. Velocity in space and the passage of time collectively form the gradient with respect time of the vector space, and everything in the universe is moving at the same four-dimensional velocity (the <a href="/wiki/Speed_of_light" title="Speed of light">speed of light</a>) within that space. Time dilation simply means that more velocity in the three space dimensions requires a correspondingly reduced velocity in the time dimension. </p> <div role="note" class="plainlinks stubtemplate" style="margin:auto; text-align:center; background-color: #f9f9f9; padding: .5em; border: 1px solid #aaa; width: 300px; font-style:italic;">This <a href="/wiki/Category:Physics" title="Category:Physics">physics</a>-related article is a <b>stub</b>.<br />You can help RationalWiki by <a rel="nofollow" class="external text" href="https://rationalwiki.org/w/index.php?title=Spacetime&action=edit"><b>expanding it</b></a>. </div>    </div></div><div class="printfooter">Retrieved from "<a dir="ltr" href="https://rationalwiki.org/w/index.php?title=Spacetime&oldid=2699320">https://rationalwiki.org/w/index.php?title=Spacetime&oldid=2699320</a>"</div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" 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