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href="#Criticisms_of_the_cataclysm_hypothesis"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Criticisms of the cataclysm hypothesis</span> </div> </a> <ul id="toc-Criticisms_of_the_cataclysm_hypothesis-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Geological_consequences_on_Earth" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Geological_consequences_on_Earth"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Geological consequences on Earth</span> </div> </a> <ul id="toc-Geological_consequences_on_Earth-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Possible_causes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Possible_causes"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Possible causes</span> </div> </a> <button aria-controls="toc-Possible_causes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Possible causes subsection</span> </button> <ul id="toc-Possible_causes-sublist" class="vector-toc-list"> <li id="toc-Giant-planet_migration" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Giant-planet_migration"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Giant-planet migration</span> </div> </a> <ul id="toc-Giant-planet_migration-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Late_formation_of_Uranus_and_Neptune" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Late_formation_of_Uranus_and_Neptune"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Late formation of Uranus and Neptune</span> </div> </a> <ul id="toc-Late_formation_of_Uranus_and_Neptune-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Planet_V_hypothesis" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Planet_V_hypothesis"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Planet V hypothesis</span> </div> </a> <ul id="toc-Planet_V_hypothesis-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Disruption_of_Mars-crossing_asteroid" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Disruption_of_Mars-crossing_asteroid"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Disruption of Mars-crossing asteroid</span> </div> </a> <ul id="toc-Disruption_of_Mars-crossing_asteroid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_potential_sources" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_potential_sources"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.5</span> <span>Other potential sources</span> </div> </a> <ul id="toc-Other_potential_sources-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Exosystem_with_possible_Late_Heavy_Bombardment" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exosystem_with_possible_Late_Heavy_Bombardment"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Exosystem with possible Late Heavy Bombardment</span> </div> </a> <ul id="toc-Exosystem_with_possible_Late_Heavy_Bombardment-sublist" class="vector-toc-list"> </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">6</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">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Late Heavy Bombardment</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 39 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-39" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">39 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Groot_Bombardement" title="Groot Bombardement – Afrikaans" lang="af" hreflang="af" data-title="Groot Bombardement" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%82%D8%B5%D9%81_%D8%B4%D8%AF%D9%8A%D8%AF_%D9%85%D8%AA%D8%A3%D8%AE%D8%B1" title="قصف شديد متأخر – Arabic" lang="ar" hreflang="ar" data-title="قصف شديد متأخر" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Gecik%C9%99n_a%C4%9F%C4%B1r_bombardman" title="Gecikən ağır bombardman – Azerbaijani" lang="az" hreflang="az" data-title="Gecikən ağır bombardman" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Gran_bombardeig_tard%C3%A0" title="Gran bombardeig tardà – Catalan" lang="ca" hreflang="ca" data-title="Gran bombardeig tardà" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Pozdn%C3%AD_velk%C3%A9_bombardov%C3%A1n%C3%AD" title="Pozdní velké bombardování – Czech" lang="cs" hreflang="cs" data-title="Pozdní velké bombardování" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Det_Store_Bombardement" title="Det Store Bombardement – Danish" lang="da" hreflang="da" data-title="Det Store Bombardement" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Sp%C3%A4tes_schweres_Bombardement" title="Spätes schweres Bombardement – German" lang="de" hreflang="de" data-title="Spätes schweres Bombardement" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Bombardeo_intenso_tard%C3%ADo" title="Bombardeo intenso tardío – Spanish" lang="es" hreflang="es" data-title="Bombardeo intenso tardío" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://eu.wikipedia.org/wiki/Bonbardaketa_Berantiar_Handia" title="Bonbardaketa Berantiar Handia – Basque" lang="eu" hreflang="eu" data-title="Bonbardaketa Berantiar Handia" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A2%D8%AE%D8%B1%DB%8C%D9%86_%D8%A8%D9%85%D8%A8%D8%A7%D8%B1%D8%A7%D9%86_%D8%B3%D9%86%DA%AF%DB%8C%D9%86" title="آخرین بمباران سنگین – Persian" lang="fa" hreflang="fa" data-title="آخرین بمباران سنگین" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Grand_bombardement_tardif" title="Grand bombardement tardif – French" lang="fr" hreflang="fr" data-title="Grand bombardement tardif" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Bombardeo_intenso_tard%C3%ADo" title="Bombardeo intenso tardío – Galician" lang="gl" hreflang="gl" data-title="Bombardeo intenso tardío" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%9B%84%EA%B8%B0_%EB%8C%80%ED%8F%AD%EA%B2%A9" title="후기 대폭격 – Korean" lang="ko" hreflang="ko" data-title="후기 대폭격" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%86%E0%A4%A6%E0%A4%BF_%E0%A4%AD%E0%A5%80%E0%A4%B7%E0%A4%A3_%E0%A4%AC%E0%A4%AE%E0%A4%AC%E0%A4%BE%E0%A4%B0%E0%A5%80" title="आदि भीषण बमबारी – Hindi" lang="hi" hreflang="hi" data-title="आदि भीषण बमबारी" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Kasno_te%C5%A1ko_bombardiranje" title="Kasno teško bombardiranje – Croatian" lang="hr" hreflang="hr" data-title="Kasno teško bombardiranje" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Pembombardiran_Berat_Akhir" title="Pembombardiran Berat Akhir – Indonesian" lang="id" hreflang="id" data-title="Pembombardiran Berat Akhir" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Intenso_bombardamento_tardivo" title="Intenso bombardamento tardivo – Italian" lang="it" hreflang="it" data-title="Intenso bombardamento tardivo" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%94%D7%94%D7%A4%D7%92%D7%96%D7%94_%D7%94%D7%9B%D7%91%D7%93%D7%94_%D7%94%D7%9E%D7%90%D7%95%D7%97%D7%A8%D7%AA" title="ההפגזה הכבדה המאוחרת – Hebrew" lang="he" hreflang="he" data-title="ההפגזה הכבדה המאוחרת" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Grousst_Bombardement" title="Grousst Bombardement – Luxembourgish" lang="lb" hreflang="lb" data-title="Grousst Bombardement" data-language-autonym="Lëtzebuergesch" data-language-local-name="Luxembourgish" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/V%C4%97lyvasis_kosminis_bombardavimas" title="Vėlyvasis kosminis bombardavimas – Lithuanian" lang="lt" hreflang="lt" data-title="Vėlyvasis kosminis bombardavimas" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/K%C3%A9s%C5%91i_nagy_bomb%C3%A1z%C3%A1s" title="Késői nagy bombázás – Hungarian" lang="hu" hreflang="hu" data-title="Késői nagy bombázás" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%94%D0%BE%D1%86%D0%BD%D0%BE_%D1%82%D0%B5%D1%88%D0%BA%D0%BE_%D0%B1%D0%BE%D0%BC%D0%B1%D0%B0%D1%80%D0%B4%D0%B8%D1%80%D0%B0%D1%9A%D0%B5" title="Доцно тешко бомбардирање – Macedonian" lang="mk" hreflang="mk" data-title="Доцно тешко бомбардирање" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B2%E0%B5%87%E0%B4%B1%E0%B5%8D%E0%B4%B1%E0%B5%8D_%E0%B4%B9%E0%B5%86%E0%B4%B5%E0%B4%BF_%E0%B4%AC%E0%B5%8B%E0%B4%82%E0%B4%AC%E0%B4%BE%E0%B4%A1%E0%B5%8D%E0%B5%BC%E2%80%8C%E0%B4%AE%E0%B5%86%E0%B4%A8%E0%B5%8D%E0%B4%B1%E0%B5%8D" title="ലേറ്റ് ഹെവി ബോംബാഡ്ർ‌മെന്റ് – Malayalam" lang="ml" hreflang="ml" data-title="ലേറ്റ് ഹെവി ബോംബാഡ്ർ‌മെന്റ്" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Pembedilan_Berat_Akhir" title="Pembedilan Berat Akhir – Malay" lang="ms" hreflang="ms" data-title="Pembedilan Berat Akhir" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Late_Heavy_Bombardment" title="Late Heavy Bombardment – Dutch" lang="nl" hreflang="nl" data-title="Late Heavy Bombardment" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%BE%8C%E6%9C%9F%E9%87%8D%E7%88%86%E6%92%83%E6%9C%9F" title="後期重爆撃期 – Japanese" lang="ja" hreflang="ja" data-title="後期重爆撃期" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Det_sene_tunge_bombardementet" title="Det sene tunge bombardementet – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Det sene tunge bombardementet" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%AF%DB%8C%D8%B1_%D8%A2%D9%84%DB%8C_%D9%BE%D8%B9%D8%A7%D8%B1%DB%8C_%D8%A8%D9%85%D8%A8%D8%A7%D8%B1%DB%8C" title="دیر آلی پعاری بمباری – Western Punjabi" lang="pnb" hreflang="pnb" data-title="دیر آلی پعاری بمباری" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wielkie_Bombardowanie" title="Wielkie Bombardowanie – Polish" lang="pl" hreflang="pl" data-title="Wielkie Bombardowanie" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Intenso_bombardeio_tardio" title="Intenso bombardeio tardio – Portuguese" lang="pt" hreflang="pt" data-title="Intenso bombardeio tardio" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Marele_bombardament_t%C3%A2rziu" title="Marele bombardament târziu – Romanian" lang="ro" hreflang="ro" data-title="Marele bombardament târziu" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B7%D0%B4%D0%BD%D1%8F%D1%8F_%D1%82%D1%8F%D0%B6%D1%91%D0%BB%D0%B0%D1%8F_%D0%B1%D0%BE%D0%BC%D0%B1%D0%B0%D1%80%D0%B4%D0%B8%D1%80%D0%BE%D0%B2%D0%BA%D0%B0" title="Поздняя тяжёлая бомбардировка – Russian" lang="ru" hreflang="ru" data-title="Поздняя тяжёлая бомбардировка" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Late_Heavy_Bombardment" title="Late Heavy Bombardment – Simple English" lang="en-simple" hreflang="en-simple" data-title="Late Heavy Bombardment" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Sena_tunga_bombardemanget" title="Sena tunga bombardemanget – Swedish" lang="sv" hreflang="sv" data-title="Sena tunga bombardemanget" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A1%D0%BE%D2%A3%D0%B3%D1%8B_%D0%B0%D0%B2%D1%8B%D1%80_%D0%B1%D0%BE%D0%BC%D0%B1%D0%B0%D0%BB%D0%B0%D1%83" title="Соңгы авыр бомбалау – Tatar" lang="tt" hreflang="tt" data-title="Соңгы авыр бомбалау" data-language-autonym="Татарча / tatarça" data-language-local-name="Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%A3%E0%B8%B0%E0%B8%94%E0%B8%A1%E0%B8%8A%E0%B8%99%E0%B8%AB%E0%B8%99%E0%B8%B1%E0%B8%81%E0%B8%84%E0%B8%A3%E0%B8%B1%E0%B9%89%E0%B8%87%E0%B8%AB%E0%B8%A5%E0%B8%B1%E0%B8%87" title="การระดมชนหนักครั้งหลัง – Thai" 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class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Precambrian_Evolution_of_Life.png/360px-Precambrian_Evolution_of_Life.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Precambrian_Evolution_of_Life.png/480px-Precambrian_Evolution_of_Life.png 2x" data-file-width="1550" data-file-height="1890" /></a><figcaption>Timescale</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Lunar_cataclysm.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Lunar_cataclysm.jpg/240px-Lunar_cataclysm.jpg" decoding="async" width="240" height="302" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Lunar_cataclysm.jpg/360px-Lunar_cataclysm.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Lunar_cataclysm.jpg/480px-Lunar_cataclysm.jpg 2x" data-file-width="3000" data-file-height="3772" /></a><figcaption>Artist's impression of the Moon during the Late Heavy Bombardment (above) and today (below)</figcaption></figure><p>The <b>Late Heavy Bombardment</b> (<b>LHB</b>), or <b>lunar cataclysm</b>, is a hypothesized <a href="/wiki/Astronomical_event" class="mw-redirect" title="Astronomical event">astronomical event</a> thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago,<sup id="cite_ref-taylor1_1-0" class="reference"><a href="#cite_note-taylor1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> at a time corresponding to the <a href="/wiki/Neohadean" class="mw-redirect" title="Neohadean">Neohadean</a> and <a href="/wiki/Eoarchean" title="Eoarchean">Eoarchean</a> eras on Earth. According to the hypothesis, during this interval, a disproportionately large number of <a href="/wiki/Asteroid" title="Asteroid">asteroids</a> and <a href="/wiki/Comet" title="Comet">comets</a> <a href="/wiki/Impact_event" title="Impact event">collided</a> into the <a href="/wiki/Terrestrial_planet" title="Terrestrial planet">terrestrial planets</a> and their <a href="/wiki/Natural_satellite" title="Natural satellite">natural satellites</a> in the <a href="/wiki/Inner_Solar_System" class="mw-redirect" title="Inner Solar System">inner Solar System</a>, including <a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a>, <a href="/wiki/Venus" title="Venus">Venus</a>, <a href="/wiki/Earth" title="Earth">Earth</a> (and the <a href="/wiki/Moon" title="Moon">Moon</a>) and <a href="/wiki/Mars" title="Mars">Mars</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> These came from both <a href="/wiki/Protoplanetary_disk" title="Protoplanetary disk">post-accretion</a> and <a href="/wiki/Formation_and_evolution_of_the_Solar_System#Planetary_migration" title="Formation and evolution of the Solar System">planetary instability</a>-driven populations of <a href="/wiki/Impact_event" title="Impact event">impactors</a>.<sup id="cite_ref-Bottke_3-0" class="reference"><a href="#cite_note-Bottke-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Although it gained widespread credence,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> definitive evidence remains elusive.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Evidence for the LHB derives from <a href="/wiki/Moon_rock" title="Moon rock">moon rock</a> samples of <a href="/wiki/Lunar_craters" title="Lunar craters">Lunar craters</a> brought back by the <a href="/wiki/Apollo_program" title="Apollo program">Apollo program</a> <a href="/wiki/Astronaut" title="Astronaut">astronauts</a>. <a href="/wiki/Radiometric_dating" title="Radiometric dating">Isotopic dating</a> showed that the rocks were last molten during impact events in a rather narrow interval of time, suggesting that a large proportion of craters were formed during this period. Several hypotheses attempt to explain this apparent spike in the flux of impactors in the inner Solar System, but no consensus yet exists. The <a href="/wiki/Nice_model" title="Nice model">Nice model</a>, popular among <a href="/wiki/Planetary_science" title="Planetary science">planetary scientists</a>, postulates that the <a href="/wiki/Giant_planet" title="Giant planet">giant planets</a> underwent <a href="/wiki/Planetary_migration" title="Planetary migration">orbital migration</a>, scattering objects from the <a href="/wiki/Asteroid_belt" title="Asteroid belt">asteroid belt</a>, <a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper belt</a>, or both, into eccentric orbits and into the path of the terrestrial planets.<sup id="cite_ref-Bottke_3-1" class="reference"><a href="#cite_note-Bottke-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Other researchers doubt the heavy bombardment, arguing for example that the apparent clustering of lunar impact-melt ages is a statistical artifact produced by sampling rocks scattered from a single large impact.<sup id="cite_ref-taylor1_1-1" class="reference"><a href="#cite_note-taylor1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> A range of evidence suggests that there may instead have been a more extended period of lunar bombardment, lasting from approximately 4.2 billion years ago to 3.5 billion years ago.<sup id="cite_ref-Zellner_6-0" class="reference"><a href="#cite_note-Zellner-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Evidence_for_a_cataclysm">Evidence for a cataclysm</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=1" title="Edit section: Evidence for a cataclysm"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The main piece of evidence for a lunar cataclysm comes from the <a href="/wiki/Radiometric_dating" title="Radiometric dating">radiometric ages</a> of impact melt rocks that were collected during the Apollo missions. The majority of these impact melts are thought to have formed during the collision of asteroids or comets tens of kilometres across, forming impact craters hundreds of kilometres in diameter. The <a href="/wiki/Apollo_15" title="Apollo 15">Apollo 15</a>, <a href="/wiki/Apollo_16" title="Apollo 16">16</a>, and <a href="/wiki/Apollo_17" title="Apollo 17">17</a> landing sites were chosen as a result of their proximity to the <a href="/wiki/Mare_Imbrium" title="Mare Imbrium">Imbrium</a>, <a href="/wiki/Mare_Nectaris" title="Mare Nectaris">Nectaris</a>, and <a href="/wiki/Mare_Serenitatis" title="Mare Serenitatis">Serenitatis</a> basins, respectively.<sup id="cite_ref-Crockett_7-0" class="reference"><a href="#cite_note-Crockett-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>The apparent clustering of ages of these impact melts, between about 3.8 and 4.1 Ga, led investigators to postulate that those ages record an intense bombardment of the <a href="/wiki/Moon" title="Moon">Moon</a>.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> They named it the "lunar cataclysm" and proposed that it represented a dramatic increase in the rate of bombardment of the Moon around 3.9 Ga. If these impact melts were derived from these three basins, then not only did these three prominent impact basins form within a short interval of time, but so did many others based on <a href="/wiki/Stratigraphy" title="Stratigraphy">stratigraphic</a> grounds.<sup id="cite_ref-Crockett_7-1" class="reference"><a href="#cite_note-Crockett-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> At the time, the hypothesis was considered controversial. </p><p>As more data has become available, particularly from <a href="/wiki/Lunar_meteorite" title="Lunar meteorite">lunar meteorites</a>, this hypothesis, while still controversial, has become more popular. The lunar meteorites are thought to randomly sample the lunar surface, and at least some of these should have originated from regions far from the Apollo landing sites. Many of the <a href="/wiki/Feldspar" title="Feldspar">feldspathic</a> lunar meteorites probably originated from the lunar far side, and impact melts within these have recently been dated. Consistent with the cataclysm hypothesis, none of their ages was found to be older than about 3.9 Ga.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Nevertheless, the ages do not "cluster" at this date, but span between 2.5 and 3.9 Ga.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>Dating of <a href="/wiki/Howardite" title="Howardite">howardite</a>, <a href="/wiki/Eucrite" title="Eucrite">eucrite</a> and <a href="/wiki/Diogenite" title="Diogenite">diogenite</a> (<a href="/wiki/HED_meteorite" title="HED meteorite">HED</a>) meteorites and <a href="/wiki/H_chondrite" title="H chondrite">H chondrite</a> meteorites originating from the asteroid belt reveal numerous ages from 3.4–4.1 Ga and an earlier peak at 4.5 Ga. The 3.4–4.1 Ga ages has been interpreted as representing an increase in impact velocities as computer simulations using hydrocode<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> reveal that the volume of impact melt increases 100–1,000 times as the impact velocity increases from the current asteroid belt average of 5 km/s to 10 km/s. Impact velocities above 10 km/s require very high inclinations or the large eccentricities of asteroids on planet-crossing orbits. Such objects are rare in the current asteroid belt but the population would be significantly increased by the sweeping of resonances due to giant planet migration.<sup id="cite_ref-March_etal_2013_13-0" class="reference"><a href="#cite_note-March_etal_2013-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>Studies of the highland crater size distributions suggest that the same family of projectiles struck Mercury and the Moon during the Late Heavy Bombardment.<sup id="cite_ref-Strom_1979_14-0" class="reference"><a href="#cite_note-Strom_1979-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> If the history of decay of late heavy bombardment on Mercury also followed the history of late heavy bombardment on the Moon, the youngest large basin discovered, <a href="/wiki/Caloris_Planitia" title="Caloris Planitia">Caloris</a>, is comparable in age to the youngest large lunar basins, Orientale and Imbrium, and all of the plains units are older than 3 billion years.<sup id="cite_ref-NASAsp467_15-0" class="reference"><a href="#cite_note-NASAsp467-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Criticisms_of_the_cataclysm_hypothesis">Criticisms of the cataclysm hypothesis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=2" title="Edit section: Criticisms of the cataclysm hypothesis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While the cataclysm hypothesis has recently become more popular (in the last fifty years), particularly among dynamicists who have identified possible causes for such a phenomenon, it is still controversial and based on debatable assumptions. Two criticisms are that (1) the "cluster" of impact ages could be an artifact of sampling a single basin's ejecta, and (2) that the lack of impact melt rocks older than about 4.1 Ga is related to all such samples having been pulverized, or their ages being reset.<sup id="cite_ref-Bottke_3-2" class="reference"><a href="#cite_note-Bottke-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Crockett_7-2" class="reference"><a href="#cite_note-Crockett-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>The first criticism concerns the origin of the impact melt rocks that were sampled at the Apollo landing sites. While these impact melts have been commonly attributed to having been derived from the closest basin, it has been argued that a large portion of these might instead be derived from the Imbrium basin.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> The Imbrium impact basin is the youngest and largest of the <a href="/wiki/Multi-ring_basins" class="mw-redirect" title="Multi-ring basins">multi-ring basins</a> found on the central nearside of the Moon, and quantitative modeling shows that significant amounts of ejecta from this event should be present at all of the Apollo landing sites. According to this alternative hypothesis, the cluster of impact melt ages near 3.9 Ga simply reflects material being collected from a single impact event, and not several. Additional criticism also argues that the age spike at 3.9 Ga identified in <sup>40</sup>Ar/<sup>39</sup>Ar dating could also be produced by an episodic early crust formation followed by partial <sup>40</sup>Ar losses as the impact rate declined.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p><p>A second criticism concerns the significance of the lack of impact melt rocks older than about 4.1 Ga. One hypothesis for this observation that does not involve a cataclysm is that old melt rocks did exist, but that their radiometric ages have all been reset by the continuous effects of impact cratering over the past 4 billion years. Furthermore, it is possible that these putative samples could all have been pulverized to such small sizes that it is impossible to obtain age determinations using standard radiometric methods.<sup id="cite_ref-Hartmann_2003_18-0" class="reference"><a href="#cite_note-Hartmann_2003-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Scientists continue to study the bombardment history of the moon in an attempt to clarify the history of the inner solar system.<sup id="cite_ref-Crockett_7-3" class="reference"><a href="#cite_note-Crockett-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bottke_3-3" class="reference"><a href="#cite_note-Bottke-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Geological_consequences_on_Earth">Geological consequences on Earth</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=3" title="Edit section: Geological consequences on Earth"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table id="Container" role="presentation" class="nomobile toccolours searchaux" style="text-align:left;padding:0 0.5em;border-style:solid;float:right;clear:right;margin:0.3em 0 0.8em 1.4em;overflow:hidden;min-width:29.95em"><tbody><tr><td colspan="3" id="Title" style="padding:1em 1em 0 1em"><div style="background-color:#77bb77;padding:0 0.2em 0 0.2em;font-weight:bold;text-align:center"><a href="/wiki/Timeline_of_the_evolutionary_history_of_life" title="Timeline of the evolutionary history of life"><span style="color:#ffffff;">Life timeline</span></a></div></td></tr><tr><td colspan="3" id="Navbox" style="padding:0;margin:0 1em 0 0;text-align:right"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist 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none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:17.621em;left:1.690em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-8.811em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccffe7;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:5.958em;height:11.663em;left:1.950em;width:11.050em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-5.831em;transform:translateY(-50%);z-index:5"><a href="/wiki/Multicellular_organism" title="Multicellular organism">Multicellular life</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ccffe7;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:5.958em;left:1.950em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-2.979em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#77dd00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:1.982em;height:7.379em;left:2.210em;width:1.170em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-3.689em;transform:translateY(-50%);z-index:5"><a href="/wiki/Plant" title="Plant"><span style="display:block; text-align:center; line-height: 0.85em;">P<br />l<br />a<br />n<br />t<br />s</span></a></div></div></div><div class="notheme" style="font-size:100%;background-color:#77dd00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.982em;left:2.210em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-0.991em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:2.203em;height:3.756em;left:3.380em;width:9.620em"><div style="font-size:100%;position:relative;top:0.5em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-1.878em;transform:translateY(-50%);z-index:5"><a href="/wiki/Arthropod" title="Arthropod">Arthropods</a> <a href="/wiki/Mollusca" title="Mollusca">Molluscs</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffff00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.982em;left:2.470em;width:3.510em"><div style="font-size:100%;position:relative;top:-0.53em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.991em;transform:translateY(-50%);z-index:5"><a href="/wiki/Flowering_plant#Evolutionary_history" title="Flowering plant">Flowers</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#e6b880;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.721em;height:2.583em;left:3.380em;width:5.070em"><div style="font-size:100%;position:relative;top:0.5em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-1.291em;transform:translateY(-50%);z-index:5"><a href="/wiki/Dinosaur" title="Dinosaur">Dinosaurs</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffcc00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:2.203em;left:8.580em;width:4.420em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-1.101em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ffcc00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.606em;height:1.597em;left:8.450em;width:4.290em"><div style="font-size:100%;position:relative;top:0.15em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.798em;transform:translateY(-50%);z-index:5"><a href="/wiki/Mammal" title="Mammal">Mammals</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#e6b880;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.333em;left:5.980em;width:2.600em"><div style="font-size:100%;position:relative;top:-0.225em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.666em;transform:translateY(-50%);z-index:5"><a href="/wiki/Bird" title="Bird">Birds</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffbbbb;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:0.606em;left:8.710em;width:4.030em"><div style="font-size:100%;position:relative;top:0.1em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.303em;transform:translateY(-50%);z-index:5"><a href="/wiki/Primate" title="Primate">Primates</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#993c00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:44.053em;height:5.947em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:0em;left:-0.05em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-2.974em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.80em;"><a href="/wiki/Hadean" title="Hadean"><span style="color:#ffffff;">H<br />a<br />d<br />e<br />a<br />n</span></a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#936a00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:27.533em;height:16.520em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:-1.2em;left:-0.05em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-8.260em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Archean" title="Archean"><span style="color:#ffffff;"><br /><br /><br />A<br />r<br />c<br />h<br />e<br />a<br />n</span></a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#f1c309;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:5.958em;height:21.575em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-10.787em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Proterozoic" title="Proterozoic"><br /><br /><br /><br /><br /><br /><br />P<br />r<br />o<br />t<br />e<br />r<br />o<br />z<br />o<br />i<br />c</a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#c1e0c1;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:5.958em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:2em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-2.979em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Phanerozoic" title="Phanerozoic">P<br />h<br />a<br />n<br />e<br />r<br />o<br />z<br />o<br />i<br />c</a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:8.260em;left:12.714em;width:0.286em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-4.130em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:2.203em;left:12.714em;width:0.286em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-1.101em;transform:translateY(-50%);z-index:5"> </div></div></div></td><td id="Annotations" style="padding:0;margin:0.7em 0 0.7em 0;float:left;position:relative;width:11.05em;height:50em"><table role="presentation" style="position:absolute;z-index:15;top:50.000em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Age_of_Earth" title="Age of Earth">Earth formed</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:48.568em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Origin_of_water_on_Earth" title="Origin of water on Earth">Earliest water</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:47.907em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">LUCA</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:44.053em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Earliest_known_life_forms" title="Earliest known life forms">Earliest fossils</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:42.952em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a class="mw-selflink selflink">LHB meteorites</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:38.546em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Geological_history_of_oxygen" title="Geological history of oxygen">Earliest oxygen</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:31.278em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Pongola_glaciation" title="Pongola glaciation">Pongola glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:25.330em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Great_Oxidation_Event" title="Great Oxidation Event">Atmospheric oxygen</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:24.780em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Huronian_glaciation" title="Huronian glaciation">Huronian glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:22.026em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolution_of_sexual_reproduction#Origin_of_sexual_reproduction" title="Evolution of sexual reproduction">Sexual reproduction</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:17.621em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Francevillian_biota" title="Francevillian biota">Earliest multicellular life</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:16.520em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolution_of_fungi" title="Evolution of fungi">Earliest fungi</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:9.361em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.25em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolutionary_history_of_plants" title="Evolutionary history of plants">Earliest plants</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:8.260em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.4em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Caveasphaera" title="Caveasphaera">Earliest animals</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:7.489em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Cryogenian" title="Cryogenian">Cryogenian ice age</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:6.993em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Ediacaran_biota" title="Ediacaran biota">Ediacaran biota</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:5.958em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.15em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Cambrian_explosion" title="Cambrian explosion">Cambrian explosion</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:4.956em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.1em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Hirnantian_glaciation" title="Hirnantian glaciation">Hirnantian glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:4.075em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.1em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Tetrapod" title="Tetrapod">Earliest tetrapods</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:3.304em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Late_Paleozoic_icehouse" title="Late Paleozoic icehouse">Karoo ice age</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:0.275em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.3em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Ape" title="Ape">Earliest apes</a> / <a href="/wiki/Human" title="Human">humans</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:0.018em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.4em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Quaternary_glaciation" title="Quaternary glaciation">Quaternary ice age</a>*</div></div></td></tr></tbody></table></td></tr><tr><td id="Caption" colspan="3" style="padding:0;margin:0 0.2em 0.7em 0.2em"><div id="Caption" class="toccolours" style="margin:0 0.5em;border-style:none;clear:both;text-align:center;width:26.8em"><div style="float:left;font-size:85%;">(<a href="/wiki/Myr" class="mw-redirect" title="Myr">million years ago</a>)</div><div style="float:right;font-size:95%;">*<i><a href="/wiki/Timeline_of_glaciation" title="Timeline of glaciation">Ice Ages</a></i></div></div></td></tr></tbody></table> <p>If a <a href="https://en.wiktionary.org/wiki/cataclysmic" class="extiw" title="wikt:cataclysmic">cataclysmic</a> cratering event truly occurred on the Moon, Earth would have been affected as well. Extrapolating lunar cratering rates<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> to Earth at this time suggests that the following number of craters would have formed:<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <ul><li>22,000 or more <a href="/wiki/Impact_crater" title="Impact crater">impact craters</a> with diameters >20 km (12 mi),</li> <li>about 40 impact basins with diameters about 1,000 km (620 mi),</li> <li>several impact basins with diameters about 5,000 km (3,100 mi),</li></ul> <p>Before the formulation of the LHB hypothesis, geologists generally assumed that Earth remained molten until about 3.8 Ga. This date could be found in many of the <a href="/wiki/Oldest_dated_rocks" title="Oldest dated rocks">oldest-known rocks</a> from around the world, and appeared to represent a strong "cutoff point" beyond which older rocks could not be found. These dates remained fairly constant even across various dating methods, including the system considered the most accurate and least affected by environment, <a href="/wiki/Uranium%E2%80%93lead_dating" title="Uranium–lead dating">uranium–lead dating</a> of <a href="/wiki/Zircon" title="Zircon">zircons</a>. As no older rocks could be found, it was generally assumed that Earth had remained molten until this date, which defined the boundary between the earlier <a href="/wiki/Hadean" title="Hadean">Hadean</a> and later <a href="/wiki/Archean" title="Archean">Archean</a> eons. Nonetheless, in 1999, the <a href="/wiki/Oldest_dated_rocks#Oldest_terrestrial_material" title="Oldest dated rocks">oldest known rock on Earth</a> was dated to be 4.031 ± 0.003 billion years old, and is part of the <a href="/wiki/Acasta_Gneiss" title="Acasta Gneiss">Acasta Gneiss</a> of the <a href="/wiki/Slave_Craton" title="Slave Craton">Slave Craton</a> in northwestern Canada.<sup id="cite_ref-Bowring_21-0" class="reference"><a href="#cite_note-Bowring-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p><p>Older rocks could be found, however, in the form of <a href="/wiki/Asteroid" title="Asteroid">asteroid</a> fragments that fall to Earth as <a href="/wiki/Meteorite" title="Meteorite">meteorites</a>. Like the rocks on Earth, asteroids also show a strong cutoff point, at about 4.6 Ga, which is assumed to be the time when the first solids formed in the <a href="/wiki/Protoplanetary_disk" title="Protoplanetary disk">protoplanetary disk</a> around the then-young Sun. The Hadean, then, was the period of time between the formation of these early rocks in space, and the eventual solidification of Earth's crust, some 700 million years later. This time would include the accretion of the planets from the disk and the slow cooling of Earth into a solid body as the <a href="/wiki/Gravitational_energy" title="Gravitational energy">gravitational potential energy</a> of accretion was released. </p><p>Later calculations showed that the rate of collapse and cooling depends on the size of the rocky body. Scaling this rate to an object of Earth mass suggested very rapid cooling, requiring only 100 million years.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> The difference between measurement and theory presented a conundrum at the time. </p><p>The LHB offers a potential explanation for this anomaly. Under this model, the rocks dating to 3.8 Ga solidified only after much of the crust was destroyed by the LHB. Collectively, the <a href="/wiki/Acasta_Gneiss" title="Acasta Gneiss">Acasta Gneiss</a> in the North American cratonic shield and the gneisses within the <a href="/wiki/Jack_Hills" title="Jack Hills">Jack Hills</a> portion of the Narryer Gneiss Terrane in Western Australia are the oldest continental fragments on Earth, yet they appear to post-date the LHB. The oldest mineral yet dated on Earth, a 4.404 Ga zircon from Jack Hills, predates this event, but it is likely a fragment of crust left over from before the LHB, contained within a much younger (~3.8 Ga old) rock.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (September 2008)">citation needed</span></a></i>]</sup> </p><p>The Jack Hills zircon led to an evolution in understanding of the Hadean eon.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> Older references generally show that Hadean Earth had a molten surface with prominent <a href="/wiki/Volcano" title="Volcano">volcanos</a>. The name "Hadean" itself refers to the "hellish" conditions assumed on Earth for the time, from the Greek <a href="/wiki/Hades" title="Hades">Hades</a>. Zircon dating suggested, albeit controversially, that the Hadean surface was solid, temperate, and covered by acidic oceans. This picture derives from the presence of particular isotopic ratios that suggest the action of water-based chemistry at some time before the formation of the oldest rocks (see <a href="/wiki/Cool_early_Earth" class="mw-redirect" title="Cool early Earth">Cool early Earth</a>).<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p><p>Of particular interest, Manfred Schidlowski argued in 1979 that the carbon isotopic ratios of some sedimentary rocks found in <a href="/wiki/Greenland" title="Greenland">Greenland</a> were a relic of organic matter: the ratio of carbon-12 to carbon-13 was unusually high, normally a sign of "processing" by life. There was much debate over the precise dating of the rocks, with Schidlowski suggesting they were about 3.8 Ga old, and others suggesting a more "modest" 3.6 Ga. In either case it was a very short time for <a href="/wiki/Abiogenesis" title="Abiogenesis">abiogenesis</a> to have taken place, and if Schidlowski was correct, arguably too short a time. The Late Heavy Bombardment and the "re-melting" of the crust that it suggests provides a timeline under which this would be possible: <a href="/wiki/Life" title="Life">life</a> either formed immediately after the Late Heavy Bombardment, or more likely survived it, having arisen earlier during the <a href="/wiki/Hadean" title="Hadean">Hadean</a>. A 2002 study suggest that the rocks Schidlowski found are indeed from the older end of the possible age range at about 3.85 Ga, suggesting the latter possibility is the most likely answer.<sup id="cite_ref-AB-20021014_25-0" class="reference"><a href="#cite_note-AB-20021014-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Studies from 2005, 2006 and 2009 have found no evidence for the isotopically-light carbon ratios that were the basis for the original claims of early Hadean life.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> However, a similar study of Jack Hills rocks from 2008 shows traces of the same sort of potential organic indicators. Thorsten Geisler of the Institute for Mineralogy at the <a href="/wiki/University_of_M%C3%BCnster" title="University of Münster">University of Münster</a> studied traces of carbon trapped in small pieces of diamond and graphite within zircons dating to 4.25 Ga.<sup id="cite_ref-NS-20080702_29-0" class="reference"><a href="#cite_note-NS-20080702-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p><p>Three-dimensional computer models developed in May 2009 by a team at the <a href="/wiki/University_of_Colorado_Boulder" title="University of Colorado Boulder">University of Colorado at Boulder</a> postulate that much of Earth's crust, and the microbes living in it, could have survived the bombardment. Their models suggest that although the surface of Earth would have been sterilized, <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal vents</a> below Earth's surface could have incubated life by providing a sanctuary for <a href="/wiki/Thermophile" title="Thermophile">thermophile microbes</a>.<sup id="cite_ref-RN-20090520_30-0" class="reference"><a href="#cite_note-RN-20090520-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> In April 2014, scientists reported finding evidence of the largest terrestrial meteor <a href="/wiki/Impact_event" title="Impact event">impact event</a> to date near the <a href="/wiki/Barberton_Greenstone_Belt#Barberton_greenstone_belt" title="Barberton Greenstone Belt">Barberton Greenstone Belt</a>. They estimated the impact occurred about 3.26 billion years ago and that the impactor was approximately 37 to 58 kilometres (23 to 36 miles) wide. The crater from this event, if it still exists, has not yet been found.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Possible_causes">Possible causes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=4" title="Edit section: Possible causes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Giant-planet_migration">Giant-planet migration</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=5" title="Edit section: Giant-planet migration"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Nice_model" title="Nice model">Nice model</a></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Lhborbits.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Lhborbits.png/600px-Lhborbits.png" decoding="async" width="600" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Lhborbits.png/900px-Lhborbits.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Lhborbits.png/1200px-Lhborbits.png 2x" data-file-width="1360" data-file-height="454" /></a><figcaption>Simulation showing outer planets and planetesimal belt: (a) Early configuration, before Jupiter (green) and Saturn (orange) reach 2:1 resonance; (b) Scattering of planetesimals into the inner Solar System after the orbital shift of Neptune (dark blue) and Uranus (light blue); (c) After ejection of planetesimals by planets.<sup id="cite_ref-Gomes05_32-0" class="reference"><a href="#cite_note-Gomes05-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup></figcaption></figure> <div style="clear:both;" class=""></div> <p>In the Nice model, the Late Heavy Bombardment is the result of a dynamical instability in the outer Solar System. The original Nice model simulations by Gomes <i>et al.</i> began with the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>'s giant planets in a tight orbital configuration surrounded by a rich <a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">trans-Neptunian belt</a>. Objects from this belt stray into planet-crossing orbits, causing the orbits of the planets to migrate over several hundred million years. Jupiter and Saturn's orbits drift apart slowly until they cross a 2:1 <a href="/wiki/Orbital_resonance" title="Orbital resonance">orbital resonance</a>, causing the <a href="/wiki/Orbital_eccentricity" title="Orbital eccentricity">eccentricities</a> of their orbits to increase. The orbits of the planets become unstable and Uranus and Neptune are scattered onto wider orbits that disrupt the outer belt, causing a bombardment of comets as they enter planet-crossing orbits. Interactions between the objects and the planets also drive a faster migration of Jupiter and Saturn's orbits. This migration causes resonances to sweep through the asteroid belt, increasing the eccentricities of many asteroids until they enter the inner Solar System and impact the terrestrial planets.<sup id="cite_ref-taylor1_1-2" class="reference"><a href="#cite_note-taylor1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Gomes05_32-1" class="reference"><a href="#cite_note-Gomes05-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p><p>The Nice model has undergone some modification since its initial publication. The giant planets now begin in a multi-resonant configuration due to an early gas-driven migration through the protoplanetary disk.<sup id="cite_ref-Morbidelli_etal_2007_33-0" class="reference"><a href="#cite_note-Morbidelli_etal_2007-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> Interactions with the trans-Neptunian belt allow their escape from the resonances after several hundred million years.<sup id="cite_ref-Levison_2011_34-0" class="reference"><a href="#cite_note-Levison_2011-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The encounters between planets that follow include one between an <a href="/wiki/Ice_giant" title="Ice giant">ice giant</a> and Saturn that propels the ice giant onto a Jupiter-crossing orbit followed by an encounter with Jupiter that drives the ice giant outward. This <a href="/wiki/Jumping-Jupiter_scenario" title="Jumping-Jupiter scenario">jumping-Jupiter scenario</a> quickly increases the separation of Jupiter and Saturn, limiting the effects of resonance sweeping on the asteroids and the terrestrial planets.<sup id="cite_ref-Brasser_2009_35-0" class="reference"><a href="#cite_note-Brasser_2009-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Morbidelli_etal_2010_36-0" class="reference"><a href="#cite_note-Morbidelli_etal_2010-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> While this is required to preserve the low eccentricities of the terrestrial planets and avoid leaving the asteroid belt with too many high-eccentricity asteroids, it also reduces the fraction of asteroids removed from the main asteroid belt, leaving a now-nearly-depleted <a href="/wiki/E-belt_asteroids" title="E-belt asteroids">inner band</a> of asteroids as the primary source of the impactors of the LHB.<sup id="cite_ref-Archaean_37-0" class="reference"><a href="#cite_note-Archaean-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> The ice giant is often ejected following its encounter with Jupiter, leading some to propose that the Solar System began with <a href="/wiki/Five-planet_Nice_model" title="Five-planet Nice model">five giant planets</a>.<sup id="cite_ref-Nesvorny_2011_38-0" class="reference"><a href="#cite_note-Nesvorny_2011-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> Recent<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Chronological_items" title="Wikipedia:Manual of Style/Dates and numbers"><span title="The time period mentioned near this tag is ambiguous. (August 2021)">when?</span></a></i>]</sup> works, however, have found that impacts from this inner asteroid belt would be insufficient to explain the formation of ancient impact <a href="/wiki/Spherule" class="mw-redirect" title="Spherule">spherule</a> beds and the lunar basins,<sup id="cite_ref-Johnson_etal_2016_39-0" class="reference"><a href="#cite_note-Johnson_etal_2016-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> and that the asteroid belt was probably not the source of the Late Heavy Bombardment.<sup id="cite_ref-Nesvorny_2016_40-0" class="reference"><a href="#cite_note-Nesvorny_2016-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Late_formation_of_Uranus_and_Neptune">Late formation of Uranus and Neptune</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=6" title="Edit section: Late formation of Uranus and Neptune"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>According to one <a href="/wiki/Planetesimal" title="Planetesimal">planetesimal</a> simulation of the establishment of the planetary system, the outermost planets Uranus and Neptune formed very slowly, over a period of several billion years.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> Harold Levison and his team have also suggested that the relatively low density of material in the outer Solar System during planet formation would have greatly slowed their accretion.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> The late formation of these planets has therefore been suggested as a different reason for the LHB. However, recent<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Chronological_items" title="Wikipedia:Manual of Style/Dates and numbers"><span title="The time period mentioned near this tag is ambiguous. (August 2021)">when?</span></a></i>]</sup> calculations of gas-flows combined with planetesimal runaway growth in the outer Solar System imply that <a href="/wiki/Giant_planet" title="Giant planet">Jovian planets</a> formed extremely rapidly, on the order of 10 My, which does not support this explanation for the LHB. </p> <div class="mw-heading mw-heading3"><h3 id="Planet_V_hypothesis">Planet V hypothesis</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=7" title="Edit section: Planet V hypothesis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Planet_V" title="Planet V">Planet V</a></div> <p>The Planet V hypothesis posits that a fifth <a href="/wiki/Terrestrial_planet" title="Terrestrial planet">terrestrial planet</a> caused the Late Heavy Bombardment when its meta-stable orbit entered the inner asteroid belt. The hypothetical fifth terrestrial planet, Planet V, had a mass less than half of Mars and originally orbited between Mars and the asteroid belt. Planet V's orbit became unstable due to perturbations from the other inner planets causing it to intersect the inner asteroid belt. After close encounters with Planet V, many asteroids entered Earth-crossing orbits, causing the Late Heavy Bombardment. Planet V was ultimately lost, likely plunging into the Sun. In numerical simulations, an uneven distribution of asteroids, with the asteroids heavily concentrated toward the inner asteroid belt, has been shown to be necessary to produce the LHB via this mechanism.<sup id="cite_ref-Brasser_2011_43-0" class="reference"><a href="#cite_note-Brasser_2011-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> An alternate version of this hypothesis in which the lunar impactors are debris resulting from Planet V impacting Mars, forming the <a href="/wiki/North_Polar_Basin_(Mars)" title="North Polar Basin (Mars)">Borealis Basin</a>, has been proposed to explain a low number of giant lunar basins relative to craters and a lack of evidence of cometary impactors.<sup id="cite_ref-Minton_etal_2015_44-0" class="reference"><a href="#cite_note-Minton_etal_2015-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Minton_Richardson_Fassett_2015_45-0" class="reference"><a href="#cite_note-Minton_Richardson_Fassett_2015-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Disruption_of_Mars-crossing_asteroid">Disruption of Mars-crossing asteroid</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=8" title="Edit section: Disruption of Mars-crossing asteroid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A hypothesis proposed by Matija Ćuk posits that the last few basin-forming impacts were the result of the collisional disruption of a large Mars-crossing asteroid. This <a href="/wiki/4_Vesta" title="4 Vesta">Vesta</a>-sized asteroid was a remnant of a population which initially was much larger than the current main asteroid belt. Most of the pre-Imbrium impacts would have been due to these Mars-crossing objects, with the early bombardment extending until 4.1 billion years ago. A period without many basin-forming impacts then followed, during which the lunar magnetic field decayed. Then, roughly 3.9 billion years ago, a catastrophic impact disrupted the Vesta-sized asteroid, significantly increasing the population of Mars-crossing objects. Many of these objects then evolved onto Earth-crossing orbits, producing a spike in the lunar impact rate during which the last few lunar impact basins are formed. Ćuk points to the weak or absent residual magnetism of the last few basins and a change in the size–frequency distribution of craters which formed during this late bombardment as evidence supporting this hypothesis.<sup id="cite_ref-Cuk_1012_46-0" class="reference"><a href="#cite_note-Cuk_1012-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> The timing<sup id="cite_ref-Cuk_etal_2010_47-0" class="reference"><a href="#cite_note-Cuk_etal_2010-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Malhatra_2011_48-0" class="reference"><a href="#cite_note-Malhatra_2011-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Cuk_etal_2011_49-0" class="reference"><a href="#cite_note-Cuk_etal_2011-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Fasset_2012_50-0" class="reference"><a href="#cite_note-Fasset_2012-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> and the cause<sup id="cite_ref-Marchi_2012_51-0" class="reference"><a href="#cite_note-Marchi_2012-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> of the change in the size–frequency distribution of craters is controversial. </p> <div class="mw-heading mw-heading3"><h3 id="Other_potential_sources">Other potential sources</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=9" title="Edit section: Other potential sources"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A number of other possible sources of the Late Heavy Bombardment have been investigated. Among these are additional Earth satellites orbiting independently or as lunar trojans, planetesimals left over from the formations of the terrestrial planets, Earth or Venus co-orbitals, and the breakup of a large main belt asteroid. Additional Earth satellites on independent orbits were shown to be quickly captured into resonances during the Moon's early tidally-driven orbital expansion and were lost or destroyed within a few million years.<sup id="cite_ref-Cuk_2008_52-0" class="reference"><a href="#cite_note-Cuk_2008-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> Lunar trojans were found to be destabilized within 100 million years by a solar resonance when the Moon reached 27 Earth radii.<sup id="cite_ref-Cuk_Gladman_2009_53-0" class="reference"><a href="#cite_note-Cuk_Gladman_2009-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> Planetesimals left over from the formation of the terrestrial planets were shown to be depleted too rapidly due to collisions and ejections to form the last lunar basins.<sup id="cite_ref-Bottke_etal_2007_54-0" class="reference"><a href="#cite_note-Bottke_etal_2007-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> The long-term stability of primordial Earth or Venus co-orbitals (trojans or objects with horseshoe orbits) in conjunction with the lack of current observations indicate that they were unlikely to have been common enough to contribute to the LHB.<sup id="cite_ref-Cuk_etal_2012_55-0" class="reference"><a href="#cite_note-Cuk_etal_2012-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> Producing the LHB from the collisional disruption of a main belt asteroid was found to require at minimum a 1,000–1,500 km parent body with the most favorable initial conditions.<sup id="cite_ref-Ito_Malhotra_2006_56-0" class="reference"><a href="#cite_note-Ito_Malhotra_2006-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> Debris produced by collisions among inner planets, now lost, has also been proposed as a source of the LHB.<sup id="cite_ref-Volk_Gladman_2015_57-0" class="reference"><a href="#cite_note-Volk_Gladman_2015-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Exosystem_with_possible_Late_Heavy_Bombardment">Exosystem with possible Late Heavy Bombardment</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=10" title="Edit section: Exosystem with possible Late Heavy Bombardment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Eta_Corvi" title="Eta Corvi">Eta Corvi</a></div> <p>Evidence has been found for Late Heavy Bombardment-like conditions around the star <a href="/wiki/Eta_Corvi" title="Eta Corvi">Eta Corvi</a>.<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> </p> <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=Late_Heavy_Bombardment&action=edit&section=11" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Cool_early_Earth" class="mw-redirect" title="Cool early Earth">Cool early Earth</a> – Geologic eon, 4567–4031 million years ago<span style="display:none" class="category-annotation-with-redirected-description">Pages displaying short descriptions of redirect targets</span></li> <li><a href="/wiki/Formation_and_evolution_of_the_Solar_System" title="Formation and evolution of the Solar System">Formation and evolution of the Solar System</a></li></ul> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Late_Heavy_Bombardment&action=edit&section=12" 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 reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-taylor1-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-taylor1_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-taylor1_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-taylor1_1-2"><sup><i><b>c</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="CITEREFTaylor,_G._Jeffrey.2006" class="citation web cs1">Taylor, G. Jeffrey. (August 2006). <a rel="nofollow" class="external text" href="http://www.psrd.hawaii.edu/Aug06/cataclysmDynamics.html">"Wandering Gas Giants and Lunar Bombardment"</a>. University of Hawaii.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Wandering+Gas+Giants+and+Lunar+Bombardment&rft.pub=University+of+Hawaii&rft.date=2006-08&rft.au=Taylor%2C+G.+Jeffrey.&rft_id=http%3A%2F%2Fwww.psrd.hawaii.edu%2FAug06%2FcataclysmDynamics.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALate+Heavy+Bombardment" 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="CITEREFClaeysMorbidelli2011" class="citation book cs1">Claeys, Philippe; Morbidelli, Alessandro (1 January 2011). "Late Heavy Bombardment". 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Currie, <i>Linar and Planetary Institute Science Conference Abstracts</i> <b>42</b>, (March 20, 2011), p. 2438, <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/2011LPI....42.2438L/abstract">2011LPI....42.2438L</a>.</span> </li> </ol></div> <p><br /> </p> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Moon" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:The_Moon" title="Template:The Moon"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:The_Moon" title="Template talk:The Moon"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:The_Moon" title="Special:EditPage/Template:The Moon"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Moon" style="font-size:114%;margin:0 4em"><a href="/wiki/Moon" title="Moon">Moon</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div><a href="/wiki/Outline_of_the_Moon" title="Outline of the Moon">Outline</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Physical<br />properties</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Internal_structure_of_the_Moon" title="Internal structure of the Moon">Internal structure</a></span></li> <li><span class="nowrap"><a href="/wiki/Selenography" title="Selenography">Topography</a></span></li> <li><span class="nowrap"><a href="/wiki/Atmosphere_of_the_Moon" title="Atmosphere of the Moon">Atmosphere</a></span></li> <li><span class="nowrap"><a href="/wiki/Gravitation_of_the_Moon" title="Gravitation of the Moon">Gravity field</a></span> <ul><li><span class="nowrap"><a href="/wiki/Hill_sphere" title="Hill sphere">Hill sphere</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Magnetic_field_of_the_Moon" title="Magnetic field of the Moon">Magnetic field</a></span></li> <li><span class="nowrap"><a href="/wiki/Sodium_tail_of_the_Moon" title="Sodium tail of the Moon">Sodium tail</a></span></li> <li><span class="nowrap"><a href="/wiki/Moonlight" title="Moonlight">Moonlight</a></span> <ul><li><span class="nowrap"><a href="/wiki/Earthlight_(astronomy)" title="Earthlight (astronomy)">Earthshine</a></span></li></ul></li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:FullMoon2010.jpg" class="mw-file-description" title="A full moon"><img alt="A full moon" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/FullMoon2010.jpg/90px-FullMoon2010.jpg" decoding="async" width="90" height="86" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/FullMoon2010.jpg/135px-FullMoon2010.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/FullMoon2010.jpg/180px-FullMoon2010.jpg 2x" data-file-width="2580" data-file-height="2452" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Orbit_of_the_Moon" title="Orbit of the Moon">Orbit</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><span class="nowrap"><a href="/wiki/Lunar_distance_(astronomy)" class="mw-redirect" title="Lunar distance (astronomy)">Lunar distance</a></span></li> <li><span class="nowrap"><a href="/wiki/Orbital_elements" title="Orbital elements">Orbital elements</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_distance_(astronomy)" class="mw-redirect" title="Lunar distance (astronomy)">Distance</a></span> <ul><li><span class="nowrap"><a href="/wiki/Apsis" title="Apsis">Perigee and apogee</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Libration" title="Libration">Libration</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_node" title="Lunar node">Nodes</a></span> <ul><li><span class="nowrap"><a href="/wiki/Nodal_period" title="Nodal period">Nodal period</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_precession" title="Lunar precession">Precession</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Syzygy_(astronomy)" title="Syzygy (astronomy)">Syzygy</a></span> <ul><li><span class="nowrap"><a href="/wiki/New_moon" title="New moon">New moon</a></span></li> <li><span class="nowrap"><a href="/wiki/Full_moon" title="Full moon">Full moon</a></span></li> <li><span class="nowrap"><a href="/wiki/Eclipse" title="Eclipse">Eclipses</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_eclipse" title="Lunar eclipse">Lunar eclipse</a></span> <ul><li><span class="nowrap"><a href="/wiki/Total_penumbral_lunar_eclipse" title="Total penumbral lunar eclipse">Total penumbral lunar eclipse</a></span></li> <li><span class="nowrap"><a href="/wiki/Tetrad_(astronomy)" title="Tetrad (astronomy)">Tetrad</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Solar_eclipse" title="Solar eclipse">Solar eclipse</a></span></li> <li><span class="nowrap"><a href="/wiki/Solar_eclipses_on_the_Moon" title="Solar eclipses on the Moon">Solar eclipses on the Moon</a></span></li> <li><span class="nowrap"><a href="/wiki/Eclipse_cycle" title="Eclipse cycle">Eclipse cycle</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Supermoon" title="Supermoon">Supermoon</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Tide" title="Tide">Tide</a></span> <ul><li><span class="nowrap"><a href="/wiki/Tidal_force" title="Tidal force">Tidal force</a></span></li> <li><span class="nowrap"><a href="/wiki/Tidal_locking" title="Tidal locking">Tidal locking</a></span></li> <li><span class="nowrap"><a href="/wiki/Tidal_acceleration" title="Tidal acceleration">Tidal acceleration</a></span></li> <li><span class="nowrap"><a href="/wiki/Tidal_range" title="Tidal range">Tidal range</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_station" title="Lunar station">Lunar station</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Surface and<br /><a href="/wiki/List_of_lunar_features" title="List of lunar features">features</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><span class="nowrap"><a href="/wiki/Selenography" title="Selenography">Selenography</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_terminator" class="mw-redirect" title="Lunar terminator">Terminator</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_limb" title="Lunar limb">Limb</a></span></li> <li><span class="nowrap">Hemispheres</span> <ul><li><span class="nowrap"><a href="/wiki/Near_side_of_the_Moon" title="Near side of the Moon">Near side</a></span></li> <li><span class="nowrap"><a href="/wiki/Far_side_of_the_Moon" title="Far side of the Moon">Far side</a></span></li></ul></li> <li><span class="nowrap">Poles</span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_north_pole" title="Lunar north pole">North pole</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_south_pole" title="Lunar south pole">South pole</a></span> <ul><li><span class="nowrap"><a href="/wiki/Face_on_Moon_South_Pole" title="Face on Moon South Pole">Face</a></span></li></ul></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_mare" title="Lunar mare">Maria</a></span> <ul><li><span class="nowrap"><a href="/wiki/List_of_maria_on_the_Moon" title="List of maria on the Moon">List</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/List_of_mountains_on_the_Moon" title="List of mountains on the Moon">Mountains</a></span> <ul><li><span class="nowrap"><a href="/wiki/Peak_of_eternal_light" title="Peak of eternal light">Peak of eternal light</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/List_of_valleys_on_the_Moon" title="List of valleys on the Moon">Valleys</a></span></li> <li><span class="nowrap"><a href="/wiki/Volcanism_on_the_Moon#Features" title="Volcanism on the Moon">Volcanic features</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_dome" title="Lunar dome">Domes</a></span></li> <li><span class="nowrap"><a href="/wiki/Caldera#The_Moon" title="Caldera">Calderas</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_lava_tube" title="Lunar lava tube">Lava tubes</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_craters" title="Lunar craters">Craters</a></span> <ul><li><span class="nowrap"><a href="/wiki/List_of_craters_on_the_Moon" title="List of craters on the Moon">List</a></span></li> <li><span class="nowrap"><a href="/wiki/Ray_system#Lunar_rays" title="Ray system">Ray systems</a></span></li> <li><span class="nowrap"><a href="/wiki/Permanently_shadowed_crater" title="Permanently shadowed crater">Permanently shadowed craters</a></span></li> <li><span class="nowrap"><a href="/wiki/South_Pole%E2%80%93Aitken_basin" title="South Pole–Aitken basin">South Pole–Aitken basin</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_soil" class="mw-redirect" title="Lunar soil">Soil</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_swirls" title="Lunar swirls">swirls</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Rille" title="Rille">Rilles</a></span></li> <li><span class="nowrap"><a href="/wiki/Wrinkle_ridge" title="Wrinkle ridge">Wrinkle ridges</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_rock" title="Moon rock">Rocks</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_basalt_70017" title="Lunar basalt 70017">Lunar basalt 70017</a></span></li> <li><span class="nowrap"><a href="/wiki/Changesite-(Y)" title="Changesite-(Y)">Changesite-(Y)</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_water" title="Lunar water">Water</a></span></li> <li><span class="nowrap"><a href="/wiki/Space_weathering" title="Space weathering">Space weathering</a></span> <ul><li><span class="nowrap"><a href="/wiki/Micrometeorite" title="Micrometeorite">Micrometeorite</a></span></li> <li><span class="nowrap"><a href="/wiki/Sputtering" title="Sputtering">Sputtering</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Quake_(natural_phenomenon)#Moonquake" title="Quake (natural phenomenon)">Quakes</a></span></li> <li><span class="nowrap"><a href="/wiki/Transient_lunar_phenomenon" title="Transient lunar phenomenon">Transient lunar phenomenon</a></span></li> <li><span class="nowrap"><a href="/wiki/Selenographic_coordinate_system" title="Selenographic coordinate system">Selenographic coordinate system</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Science</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Lunar_observation" title="Lunar observation">Observation</a></span></li> <li><span class="nowrap"><a href="/wiki/Libration#Lunar_libration" title="Libration">Libration</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_theory" title="Lunar theory">Lunar theory</a></span></li> <li><span class="nowrap"><a href="/wiki/Origin_of_the_Moon" title="Origin of the Moon">Origin</a></span> <ul><li><span class="nowrap"><a href="/wiki/Giant-impact_hypothesis" title="Giant-impact hypothesis">Giant-impact hypothesis</a></span> <ul><li><span class="nowrap"><a href="/wiki/Theia_(planet)" title="Theia (planet)">Theia</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_magma_ocean" title="Lunar magma ocean">Lunar magma ocean</a></span></li></ul></li></ul></li> <li><span class="nowrap"><a href="/wiki/Geology_of_the_Moon" title="Geology of the Moon">Geology</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_geologic_timescale" title="Lunar geologic timescale">Timescale</a></span> <ul><li><span class="nowrap"><a class="mw-selflink selflink">Late Heavy Bombardment</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_meteorite" title="Lunar meteorite">Lunar meteorites</a></span></li> <li><span class="nowrap"><a href="/wiki/KREEP" title="KREEP">KREEP</a></span></li> <li><span class="nowrap"><a href="/wiki/Volcanism_on_the_Moon" title="Volcanism on the Moon">Volcanism</a></span></li></ul></li> <li><span class="nowrap">Experiments</span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_Laser_Ranging_experiment" class="mw-redirect" title="Lunar Laser Ranging experiment">Lunar laser ranging</a></span></li> <li><span class="nowrap"><a href="/wiki/Apollo_Lunar_Surface_Experiments_Package" title="Apollo Lunar Surface Experiments Package">ALSEP</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_sample_displays" title="Lunar sample displays">Lunar sample displays</a></span> <ul><li><span class="nowrap"><a href="/wiki/Apollo_11_lunar_sample_display" title="Apollo 11 lunar sample display">Apollo 11</a></span></li> <li><span class="nowrap"><a href="/wiki/Apollo_17_lunar_sample_display" title="Apollo 17 lunar sample display">Apollo 17</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Lunar_seismology" title="Lunar seismology">Lunar seismology</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Exploration_of_the_Moon" title="Exploration of the Moon">Exploration</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><span class="nowrap"><a href="/wiki/List_of_missions_to_the_Moon" title="List of missions to the Moon">Missions</a></span> <ul><li><span class="nowrap"><a href="/wiki/Apollo_program" title="Apollo program">Apollo program</a></span></li> <li><span class="nowrap"><a href="/wiki/List_of_people_who_have_walked_on_the_Moon" class="mw-redirect" title="List of people who have walked on the Moon">Explorers</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/List_of_lunar_probes" title="List of lunar probes">Probes</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_landing" title="Moon landing">Landing</a></span></li> <li><span class="nowrap"><a href="/wiki/Colonization_of_the_Moon" title="Colonization of the Moon">Colonization</a></span> <ul><li><span class="nowrap"><a href="/wiki/Moonbase" title="Moonbase">Moonbase</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Tourism_on_the_Moon" title="Tourism on the Moon">Tourism</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_resources" title="Lunar resources">Lunar resources</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Time-telling <br />and <a href="/wiki/Celestial_navigation" title="Celestial navigation">navigation</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><span class="nowrap"><a href="/wiki/Lunar_calendar" title="Lunar calendar">Lunar calendar</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunisolar_calendar" title="Lunisolar calendar">Lunisolar calendar</a></span></li> <li><span class="nowrap"><a href="/wiki/Month" title="Month">Month</a></span> <ul><li><span class="nowrap"><a href="/wiki/Lunar_month" title="Lunar month">Lunar month</a></span> <ul><li><span class="nowrap"><a href="/wiki/Nodal_period" title="Nodal period">Nodal period</a></span></li></ul></li></ul></li> <li><span class="nowrap"><a href="/wiki/Fortnight" title="Fortnight">Fortnight</a></span></li> <li><span class="nowrap"><a href="/wiki/Week" title="Week">Sennight</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_station" title="Lunar station">Lunar station</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_distance_(navigation)" title="Lunar distance (navigation)">Lunar distance</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Lunar_phase" title="Lunar phase">Phases</a> and<br />names</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/New_moon" title="New moon">New</a></span></li> <li><span class="nowrap"><a href="/wiki/Full_moon" title="Full moon">Full</a></span> <ul><li><span class="nowrap"><a href="/wiki/Full_moon#Full_moon_names" title="Full moon">Names</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Crescent" title="Crescent">Crescent</a></span></li> <li><span class="nowrap"><a href="/wiki/Supermoon" title="Supermoon">Super and micro</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_eclipse" title="Lunar eclipse">Blood</a></span></li> <li><span class="nowrap"><a href="/wiki/Blue_moon" title="Blue moon">Blue</a></span></li> <li><span class="nowrap"><a href="/wiki/Black_moon" title="Black moon">Black</a></span></li> <li><span class="nowrap"><a href="/wiki/Dark_moon" title="Dark moon">Dark</a></span></li> <li><span class="nowrap"><a href="/wiki/Wet_moon" title="Wet moon">Wet</a></span></li> <li><span class="nowrap"><a href="/wiki/Tetrad_(astronomy)" title="Tetrad (astronomy)">Tetrad</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Daily phenomena</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Moonrise_and_moonset" title="Moonrise and moonset">Moonrise</a></span></li> <li><span class="nowrap"><a href="/wiki/Culmination" title="Culmination">Meridian passage</a></span></li> <li><span class="nowrap"><a href="/wiki/Moonrise_and_moonset" title="Moonrise and moonset">Moonset</a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><span class="nowrap"><a href="/wiki/Lunar_deity" title="Lunar deity">Lunar deities</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_effect" title="Lunar effect">Lunar effect</a></span></li> <li><span class="nowrap"><a href="/wiki/Earth_phase" title="Earth phase">Earth phase</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_illusion" title="Moon illusion">Moon illusion</a></span></li> <li><span class="nowrap"><a href="/wiki/Lunar_pareidolia" title="Lunar pareidolia">Pareidolia</a></span> <ul><li><span class="nowrap"><a href="/wiki/Man_in_the_Moon" title="Man in the Moon">Man in the Moon</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_rabbit" title="Moon rabbit">Moon rabbit</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/List_of_people_with_craters_of_the_Moon_named_after_them" title="List of people with craters of the Moon named after them">Craters named after people</a></span></li> <li><span class="nowrap"><a href="/wiki/List_of_artificial_objects_on_the_Moon" title="List of artificial objects on the Moon">Artificial objects on the Moon</a></span></li> <li><span class="nowrap"><a href="/wiki/List_of_extraterrestrial_memorials#The_Moon" title="List of extraterrestrial memorials">Memorials on the Moon</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_in_science_fiction" title="Moon in science fiction">Moon in science fiction</a></span> <ul><li><span class="nowrap"><a href="/wiki/List_of_appearances_of_the_Moon_in_fiction" title="List of appearances of the Moon in fiction">list</a></span></li> <li><span class="nowrap"><a href="/wiki/List_of_fictional_astronauts_(Project_Apollo_era)" title="List of fictional astronauts (Project Apollo era)">Apollo era</a></span></li> <li><span class="nowrap"><a href="/wiki/List_of_fictional_astronauts_(futuristic_exploration_of_Moon)" title="List of fictional astronauts (futuristic exploration of Moon)">futuristic exploration</a></span></li> <li><span class="nowrap"><a href="/wiki/Hollow_Moon" title="Hollow Moon">Hollow Moon</a></span></li></ul></li> <li><span class="nowrap"><a href="/wiki/Moon_landing_conspiracy_theories" title="Moon landing conspiracy theories">Moon landing conspiracy theories</a></span></li> <li><span class="nowrap"><a href="/wiki/Moon_Treaty" title="Moon Treaty">Moon Treaty</a></span></li> <li><span class="nowrap">"<a href="/wiki/The_Moon_is_made_of_green_cheese" title="The Moon is made of green cheese">Moon is made of green cheese</a>"</span></li> <li><span class="nowrap"><a href="/wiki/Natural_satellite" title="Natural satellite">Natural satellite</a></span></li> <li><span class="nowrap"><a href="/wiki/Double_planet" title="Double planet">Double planet</a></span></li> <li><span class="nowrap"><a href="/wiki/Planetary_objects_proposed_in_religion,_astrology,_ufology_and_pseudoscience#Lilith" title="Planetary objects proposed in religion, astrology, ufology and pseudoscience">Lilith (hypothetical second moon)</a></span></li> <li><span class="nowrap"><a href="/wiki/Splitting_of_the_Moon" title="Splitting of the Moon">Splitting of the Moon</a></span></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><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> <a href="/wiki/Category:Moon" title="Category:Moon">Category</a></span></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Impact_cratering_on_Earth" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3" style="background-color:#c8b890;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Impact_cratering_on_Earth" title="Template:Impact cratering on Earth"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Impact_cratering_on_Earth" title="Template talk:Impact cratering on Earth"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Impact_cratering_on_Earth" title="Special:EditPage/Template:Impact cratering on Earth"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Impact_cratering_on_Earth" style="font-size:114%;margin:0 4em"><a href="/wiki/List_of_impact_structures_on_Earth" title="List of impact structures on Earth">Impact cratering on Earth</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3" style="background-color:#c8b890;"><div> <ul><li><a href="/wiki/Impact_crater" title="Impact crater">Impact crater</a></li> <li><a href="/wiki/Impact_event" title="Impact event">Impact event</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background-color:#c8b890;;width:1%">Lists</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/List_of_impact_structures_on_Earth" title="List of impact structures on Earth">Worldwide</a></li> <li><a href="/wiki/List_of_impact_structures_in_Africa" title="List of impact structures in Africa">Africa</a></li> <li><a href="/wiki/List_of_impact_structures_in_Antarctica" title="List of impact structures in Antarctica">Antarctica</a></li> <li><a href="/wiki/List_of_impact_structures_in_Asia_and_Russia" title="List of impact structures in Asia and Russia">Asia and Russia</a></li> <li><a href="/wiki/List_of_impact_structures_in_Australia" title="List of impact structures in Australia">Australia</a></li> <li><a href="/wiki/List_of_impact_structures_in_Europe" title="List of impact structures in Europe">Europe</a></li> <li><a href="/wiki/List_of_impact_structures_in_North_America" title="List of impact structures in North America">North America</a></li> <li><a href="/wiki/List_of_impact_structures_in_South_America" title="List of impact structures in South America">South America</a></li> <li><a href="/wiki/Category:Impact_craters_by_country" title="Category:Impact craters by country">By country</a></li> <li><a href="/wiki/List_of_possible_impact_structures_on_Earth" title="List of possible impact structures on Earth">Possible</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="4" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Pingualuit_aerial_2007.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Pingualuit_aerial_2007.jpg/120px-Pingualuit_aerial_2007.jpg" decoding="async" width="120" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Pingualuit_aerial_2007.jpg/180px-Pingualuit_aerial_2007.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Pingualuit_aerial_2007.jpg/240px-Pingualuit_aerial_2007.jpg 2x" data-file-width="6000" data-file-height="4000" /></a></span><br /><span typeof="mw:File"><a href="/wiki/File:Craterstructure.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Craterstructure.gif/120px-Craterstructure.gif" decoding="async" width="120" height="109" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Craterstructure.gif/180px-Craterstructure.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Craterstructure.gif/240px-Craterstructure.gif 2x" data-file-width="789" data-file-height="715" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="background-color:#c8b890;;width:1%">Confirmed<div style="clear:both;" class=""></div>≥20 km diameter</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/Acraman_impact_structure" title="Acraman impact structure">Acraman</a></li> <li><a href="/wiki/Amelia_Creek_crater" title="Amelia Creek crater">Amelia Creek</a></li> <li><a href="/wiki/Araguainha_crater" title="Araguainha crater">Araguainha</a></li> <li><a href="/wiki/Beaverhead_impact_structure" title="Beaverhead impact structure">Beaverhead</a></li> <li><a href="/wiki/Boltysh_crater" title="Boltysh crater">Boltysh</a></li> <li><a href="/wiki/Carswell_impact_structure" title="Carswell impact structure">Carswell</a></li> <li><a href="/wiki/Charlevoix_impact_structure" title="Charlevoix impact structure">Charlevoix</a></li> <li><a href="/wiki/Chesapeake_Bay_impact_crater" title="Chesapeake Bay impact crater">Chesapeake Bay</a></li> <li><a href="/wiki/Chicxulub_crater" title="Chicxulub crater">Chicxulub</a></li> <li><a href="/wiki/Clearwater_Lakes" title="Clearwater Lakes">Clearwater East and West</a></li> <li><a href="/wiki/Gosses_Bluff_impact_structure" title="Gosses Bluff impact structure">Gosses Bluff</a></li> <li><a href="/wiki/Haughton_impact_crater" title="Haughton impact crater">Haughton</a></li> <li><a href="/wiki/Kamensk_crater" title="Kamensk crater">Kamensk</a></li> <li><a href="/wiki/Kara_crater" title="Kara crater">Kara</a></li> <li><a href="/wiki/Karakul_(Tajikistan)" title="Karakul (Tajikistan)">Karakul</a></li> <li><a href="/wiki/Keurusselk%C3%A4" title="Keurusselkä">Keurusselkä</a></li> <li><a href="/wiki/Lake_Lappaj%C3%A4rvi" title="Lake Lappajärvi">Lappajärvi</a></li> <li><a href="/wiki/Logancha_crater" title="Logancha crater">Logancha</a></li> <li><a href="/wiki/Manicouagan_impact_structure" class="mw-redirect" title="Manicouagan impact structure">Manicouagan</a></li> <li><a href="/wiki/Manson_impact_structure" title="Manson impact structure">Manson</a></li> <li><a href="/wiki/Mistastin_crater" title="Mistastin crater">Mistastin</a></li> <li><a href="/wiki/Mj%C3%B8lnir_crater" title="Mjølnir crater">Mjølnir</a></li> <li><a href="/wiki/Montagnais_crater" title="Montagnais crater">Montagnais</a></li> <li><a href="/wiki/Morokweng_impact_structure" title="Morokweng impact structure">Morokweng</a></li> <li><a href="/wiki/N%C3%B6rdlinger_Ries" title="Nördlinger Ries">Nördlinger Ries</a></li> <li><a href="/wiki/Obolon%27_crater" title="Obolon' crater">Obolon'</a></li> <li><a href="/wiki/Popigai_impact_structure" title="Popigai impact structure">Popigai</a></li> <li><a href="/wiki/Presqu%27%C3%AEle_crater" title="Presqu'île crater">Presqu'île</a></li> <li><a href="/wiki/Puchezh-Katunki_crater" title="Puchezh-Katunki crater">Puchezh-Katunki</a></li> <li><a href="/wiki/Rochechouart_impact_structure" title="Rochechouart impact structure">Rochechouart</a></li> <li><a href="/wiki/Saint_Martin_impact_structure" title="Saint Martin impact structure">Saint Martin</a></li> <li><a href="/wiki/Shoemaker_impact_structure" title="Shoemaker impact structure">Shoemaker</a></li> <li><a href="/wiki/Siljan_Ring" title="Siljan Ring">Siljan Ring</a></li> <li><a href="/wiki/Slate_Islands_(Ontario)" title="Slate Islands (Ontario)">Slate Islands</a></li> <li><a href="/wiki/Steen_River_impact_structure" title="Steen River impact structure">Steen River</a></li> <li><a href="/wiki/Strangways_crater" title="Strangways crater">Strangways</a></li> <li><a href="/wiki/Sudbury_Basin" title="Sudbury Basin">Sudbury</a></li> <li><a href="/wiki/Tookoonooka_impact_structure" title="Tookoonooka impact structure">Tookoonooka</a></li> <li><a href="/wiki/Tunnunik_impact_structure" title="Tunnunik impact structure">Tunnunik</a></li> <li><a href="/wiki/Vredefort_impact_structure" title="Vredefort impact structure">Vredefort</a></li> <li><a href="/wiki/Woodleigh_impact_structure" title="Woodleigh impact structure">Woodleigh</a></li> <li><a href="/wiki/Yarrabubba_impact_structure" title="Yarrabubba impact structure">Yarrabubba</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background-color:#c8b890;;width:1%">Topics</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/Alvarez_hypothesis" title="Alvarez hypothesis">Alvarez hypothesis</a></li> <li><a href="/wiki/Australite" title="Australite">Australite</a></li> <li><a href="/wiki/Breccia" title="Breccia">Breccia</a></li> <li><a href="/wiki/Coesite" title="Coesite">Coesite</a></li> <li><a href="/wiki/Complex_crater" title="Complex crater">Complex crater</a></li> <li><a href="/wiki/Cretaceous%E2%80%93Paleogene_boundary" title="Cretaceous–Paleogene boundary">Cretaceous–Paleogene boundary</a></li> <li><a href="/wiki/Cryptoexplosion" title="Cryptoexplosion">Cryptoexplosion</a></li> <li><a href="/wiki/Ejecta_blanket" title="Ejecta blanket">Ejecta blanket</a></li> <li><a href="/wiki/Impact_crater" title="Impact crater">Impact crater</a></li> <li><a href="/wiki/Impact_structure" title="Impact structure">Impact structure</a></li> <li><a href="/wiki/Impactite" title="Impactite">Impactite</a></li> <li><a class="mw-selflink selflink">Late Heavy Bombardment</a></li> <li><a href="/wiki/Lechatelierite" title="Lechatelierite">Lechatelierite</a></li> <li><a href="/wiki/Meteorite" title="Meteorite">Meteorite</a></li> <li><a href="/wiki/Moldavite" title="Moldavite">Moldavite</a></li> <li><a href="/wiki/Ordovician_meteor_event" title="Ordovician meteor event">Ordovician meteor event</a></li> <li><a href="/wiki/Philippinite" title="Philippinite">Philippinite</a></li> <li><a href="/wiki/Planar_deformation_features" title="Planar deformation features">Planar deformation features</a></li> <li><a href="/wiki/Shatter_cone" title="Shatter cone">Shatter cone</a></li> <li><a href="/wiki/Shock_metamorphism" title="Shock metamorphism">Shock metamorphism</a></li> <li><a href="/wiki/Shocked_quartz" title="Shocked quartz">Shocked quartz</a></li> <li><a href="/wiki/Stishovite" title="Stishovite">Stishovite</a></li> <li><a href="/wiki/Suevite" title="Suevite">Suevite</a></li> <li><a href="/wiki/Tektite" title="Tektite">Tektite</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background-color:#c8b890;;width:1%">Research</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/Ralph_Belknap_Baldwin" title="Ralph Belknap Baldwin">Ralph Belknap Baldwin</a></li> <li><a href="/wiki/Daniel_Barringer_(geologist)" title="Daniel Barringer (geologist)">Daniel Barringer</a> <ul><li><a href="/wiki/Barringer_Medal" title="Barringer Medal">Barringer Medal</a></li></ul></li> <li><a href="/wiki/Edward_C._T._Chao" title="Edward C. T. Chao">Edward C. T. Chao</a></li> <li><a href="/wiki/Robert_S._Dietz" title="Robert S. Dietz">Robert S. Dietz</a></li> <li><a href="/wiki/William_Kenneth_Hartmann" title="William Kenneth Hartmann">William Kenneth Hartmann</a></li> <li><a href="/wiki/H._Jay_Melosh" title="H. Jay Melosh">H. Jay Melosh</a></li> <li><a href="/wiki/Graham_Ryder" title="Graham Ryder">Graham Ryder</a></li> <li><a href="/wiki/Peter_H._Schultz" title="Peter H. Schultz">Peter H. Schultz</a></li> <li><a href="/wiki/Eugene_Merle_Shoemaker" title="Eugene Merle Shoemaker">Eugene Merle Shoemaker</a></li> <li><a href="/wiki/Earth_Impact_Database" title="Earth Impact Database">Earth Impact Database</a></li> <li><a href="/wiki/Impact_Field_Studies_Group" title="Impact Field Studies Group">Impact Field Studies Group</a></li> <li><a href="/wiki/Lunar_and_Planetary_Institute" title="Lunar and Planetary Institute">Lunar and Planetary Institute</a></li> <li><i><a href="/wiki/Traces_of_Catastrophe" title="Traces of Catastrophe">Traces of Catastrophe</a></i></li></ul> </div></td></tr></tbody></table></div> <style data-mw-deduplicate="TemplateStyles:r1130092004">.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;justify-content:center;align-items:baseline}.mw-parser-output .portal-bar-bordered{padding:0 2em;background-color:#fdfdfd;border:1px solid #a2a9b1;clear:both;margin:1em auto 0}.mw-parser-output .portal-bar-related{font-size:100%;justify-content:flex-start}.mw-parser-output .portal-bar-unbordered{padding:0 1.7em;margin-left:0}.mw-parser-output .portal-bar-header{margin:0 1em 0 0.5em;flex:0 0 auto;min-height:24px}.mw-parser-output .portal-bar-content{display:flex;flex-flow:row wrap;flex:0 1 auto;padding:0.15em 0;column-gap:1em;align-items:baseline;margin:0;list-style:none}.mw-parser-output .portal-bar-content-related{margin:0;list-style:none}.mw-parser-output .portal-bar-item{display:inline-block;margin:0.15em 0.2em;min-height:24px;line-height:24px}@media screen and (max-width:768px){.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;flex-flow:column wrap;align-items:baseline}.mw-parser-output .portal-bar-header{text-align:center;flex:0;padding-left:0.5em;margin:0 auto}.mw-parser-output .portal-bar-related{font-size:100%;align-items:flex-start}.mw-parser-output .portal-bar-content{display:flex;flex-flow:row wrap;align-items:center;flex:0;column-gap:1em;border-top:1px solid #a2a9b1;margin:0 auto;list-style:none}.mw-parser-output .portal-bar-content-related{border-top:none;margin:0;list-style:none}}.mw-parser-output .navbox+link+.portal-bar,.mw-parser-output .navbox+style+.portal-bar,.mw-parser-output .navbox+link+.portal-bar-bordered,.mw-parser-output .navbox+style+.portal-bar-bordered,.mw-parser-output .sister-bar+link+.portal-bar,.mw-parser-output .sister-bar+style+.portal-bar,.mw-parser-output .portal-bar+.navbox-styles+.navbox,.mw-parser-output .portal-bar+.navbox-styles+.sister-bar{margin-top:-1px}</style><div class="portal-bar noprint metadata noviewer portal-bar-bordered" role="navigation" aria-label="Portals"><span class="portal-bar-header"><a href="/wiki/Wikipedia:Contents/Portals" title="Wikipedia:Contents/Portals">Portals</a>:</span><ul class="portal-bar-content"><li class="portal-bar-item"><span class="nowrap"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/19px-Crab_Nebula.jpg" decoding="async" width="19" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/29px-Crab_Nebula.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/38px-Crab_Nebula.jpg 2x" data-file-width="3864" data-file-height="3864" /></span></span> </span><a href="/wiki/Portal:Astronomy" title="Portal:Astronomy">Astronomy</a></li><li class="portal-bar-item"><span class="nowrap"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Solar_system.jpg/15px-Solar_system.jpg" decoding="async" width="15" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/83/Solar_system.jpg/23px-Solar_system.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/83/Solar_system.jpg/30px-Solar_system.jpg 2x" data-file-width="4500" data-file-height="5600" /></span></span> </span><a href="/wiki/Portal:Solar_System" title="Portal:Solar System">Solar System</a></li><li class="portal-bar-item"><span class="nowrap"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/21px-Earth-moon.jpg" decoding="async" width="21" height="17" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/32px-Earth-moon.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Earth-moon.jpg/42px-Earth-moon.jpg 2x" data-file-width="3000" data-file-height="2400" /></span></span> </span><a href="/wiki/Portal:Space" class="mw-redirect" title="Portal:Space">Space</a></li></ul></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; 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