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class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contidos</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mover á barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">agochar</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inicio</div> </a> </li> <li id="toc-Hipótese" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Hipótese"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Hipótese</span> </div> </a> <ul id="toc-Hipótese-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Estrutura_e_composición" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Estrutura_e_composición"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Estrutura e composición</span> </div> </a> <ul id="toc-Estrutura_e_composición-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Orixe" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Orixe"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Orixe</span> </div> </a> <ul id="toc-Orixe-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cometas" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Cometas"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Cometas</span> </div> </a> <ul id="toc-Cometas-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Efectos_de_marea" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Efectos_de_marea"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Efectos de marea</span> </div> </a> <ul id="toc-Efectos_de_marea-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Perturbacións_estelares_e_hipóteses_de_compañeiros_estelares" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Perturbacións_estelares_e_hipóteses_de_compañeiros_estelares"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Perturbacións estelares e hipóteses de compañeiros estelares</span> </div> </a> <ul id="toc-Perturbacións_estelares_e_hipóteses_de_compañeiros_estelares-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exploración" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exploración"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Exploración</span> </div> </a> <ul id="toc-Exploración-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notas" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notas"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Notas</span> </div> </a> <ul id="toc-Notas-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="Contidos" 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="Mostrar ou agochar a táboa de contidos" > <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">Mostrar ou agochar a táboa de contidos</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">Nube de Oort</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="Ir a un artigo noutra lingua. Dispoñible en 95 linguas" > <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-95" 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">95 linguas</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/Oortwolk" title="Oortwolk – afrikaans" lang="af" hreflang="af" data-title="Oortwolk" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Boira_d%27Oort" title="Boira d'Oort – aragonés" lang="an" hreflang="an" data-title="Boira d'Oort" data-language-autonym="Aragonés" data-language-local-name="aragonés" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%AD%D8%A7%D8%A8%D8%A9_%D8%A3%D9%88%D8%B1%D8%B7" title="سحابة أورط – árabe" lang="ar" hreflang="ar" data-title="سحابة أورط" data-language-autonym="العربية" data-language-local-name="árabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%BA%D9%8A%D8%A7%D9%85%D8%A9_%D8%AF_%D8%A4%D8%B1%D8%AA" title="غيامة د ؤرت – Moroccan Arabic" lang="ary" hreflang="ary" data-title="غيامة د ؤرت" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%89%E0%A7%B0%E0%A7%8D%E0%A6%9F_%E0%A6%AE%E0%A7%87%E0%A6%98" title="উৰ্ট মেঘ – assamés" lang="as" hreflang="as" data-title="উৰ্ট মেঘ" data-language-autonym="অসমীয়া" data-language-local-name="assamés" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Nube_d%27Oort" title="Nube d'Oort – asturiano" lang="ast" hreflang="ast" data-title="Nube d'Oort" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Oort_buludu" title="Oort buludu – acerbaixano" lang="az" hreflang="az" data-title="Oort buludu" data-language-autonym="Azərbaycanca" data-language-local-name="acerbaixano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Oortsche_Woikn" title="Oortsche Woikn – Bavarian" lang="bar" hreflang="bar" data-title="Oortsche Woikn" data-language-autonym="Boarisch" data-language-local-name="Bavarian" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%92%D0%BE%D0%B1%D0%BB%D0%B0%D0%BA%D0%B0_%D0%9E%D0%B0%D1%80%D1%82%D0%B0" title="Воблака Оарта – belaruso" lang="be" hreflang="be" data-title="Воблака Оарта" data-language-autonym="Беларуская" data-language-local-name="belaruso" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%92%D0%BE%D0%B1%D0%BB%D0%B0%D0%BA%D0%B0_%D0%9E%D0%BE%D1%80%D1%82%D0%B0" title="Воблака Оорта – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Воблака Оорта" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9E%D0%B1%D0%BB%D0%B0%D0%BA_%D0%BD%D0%B0_%D0%9E%D0%BE%D1%80%D1%82" title="Облак на Оорт – búlgaro" lang="bg" hreflang="bg" data-title="Облак на Оорт" data-language-autonym="Български" data-language-local-name="búlgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%89%E0%A6%B0%E0%A7%8D%E0%A6%9F_%E0%A6%AE%E0%A7%87%E0%A6%98" title="উর্ট মেঘ – bengalí" lang="bn" hreflang="bn" data-title="উর্ট মেঘ" data-language-autonym="বাংলা" data-language-local-name="bengalí" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Koumoulennad_Oort" title="Koumoulennad Oort – bretón" lang="br" hreflang="br" data-title="Koumoulennad Oort" data-language-autonym="Brezhoneg" data-language-local-name="bretón" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Oortov_oblak" title="Oortov oblak – bosníaco" lang="bs" hreflang="bs" data-title="Oortov oblak" data-language-autonym="Bosanski" data-language-local-name="bosníaco" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://ca.wikipedia.org/wiki/N%C3%BAvol_d%27Oort" title="Núvol d'Oort – catalán" lang="ca" hreflang="ca" data-title="Núvol d'Oort" data-language-autonym="Català" data-language-local-name="catalán" 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/Oort%C5%AFv_oblak" title="Oortův oblak – checo" lang="cs" hreflang="cs" data-title="Oortův oblak" data-language-autonym="Čeština" data-language-local-name="checo" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Cwmwl_Oort" title="Cwmwl Oort – galés" lang="cy" hreflang="cy" data-title="Cwmwl Oort" data-language-autonym="Cymraeg" data-language-local-name="galés" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Oortskyen" title="Oortskyen – dinamarqués" lang="da" hreflang="da" data-title="Oortskyen" data-language-autonym="Dansk" data-language-local-name="dinamarqués" 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/Oortsche_Wolke" title="Oortsche Wolke – alemán" lang="de" hreflang="de" data-title="Oortsche Wolke" data-language-autonym="Deutsch" data-language-local-name="alemán" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9D%CE%AD%CF%86%CE%BF%CF%82_%CF%84%CE%BF%CF%85_%CE%8C%CE%BF%CF%81%CF%84" title="Νέφος του Όορτ – grego" lang="el" hreflang="el" data-title="Νέφος του Όορτ" data-language-autonym="Ελληνικά" data-language-local-name="grego" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/N%C3%B9vul_%27d_Oort" title="Nùvul 'd Oort – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="Nùvul 'd Oort" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-en badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://en.wikipedia.org/wiki/Oort_cloud" title="Oort cloud – inglés" lang="en" hreflang="en" data-title="Oort cloud" data-language-autonym="English" data-language-local-name="inglés" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Oorta_nubo" title="Oorta nubo – esperanto" lang="eo" hreflang="eo" data-title="Oorta nubo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://es.wikipedia.org/wiki/Nube_de_Oort" title="Nube de Oort – español" lang="es" hreflang="es" data-title="Nube de Oort" data-language-autonym="Español" data-language-local-name="español" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/%C3%96piku-Oorti_pilv" title="Öpiku-Oorti pilv – estoniano" lang="et" hreflang="et" data-title="Öpiku-Oorti pilv" data-language-autonym="Eesti" data-language-local-name="estoniano" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://eu.wikipedia.org/wiki/Oorten_hodeia" title="Oorten hodeia – éuscaro" lang="eu" hreflang="eu" data-title="Oorten hodeia" data-language-autonym="Euskara" data-language-local-name="éuscaro" 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%A7%D8%A8%D8%B1_%D8%A7%D9%88%D8%B1%D8%AA" title="ابر اورت – persa" lang="fa" hreflang="fa" data-title="ابر اورت" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Oortin_pilvi" title="Oortin pilvi – finés" lang="fi" hreflang="fi" data-title="Oortin pilvi" data-language-autonym="Suomi" data-language-local-name="finés" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Nuage_de_Oort" title="Nuage de Oort – francés" lang="fr" hreflang="fr" data-title="Nuage de Oort" data-language-autonym="Français" data-language-local-name="francés" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Scamall_Oort" title="Scamall Oort – irlandés" lang="ga" hreflang="ga" data-title="Scamall Oort" data-language-autonym="Gaeilge" data-language-local-name="irlandés" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/Neul_Oort" title="Neul Oort – gaélico escocés" lang="gd" hreflang="gd" data-title="Neul Oort" data-language-autonym="Gàidhlig" data-language-local-name="gaélico escocés" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Arai_Oort" title="Arai Oort – guaraní" lang="gn" hreflang="gn" data-title="Arai Oort" data-language-autonym="Avañe'ẽ" data-language-local-name="guaraní" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A2%D7%A0%D7%A0%D7%AA_%D7%90%D7%95%D7%A8%D7%98" title="עננת אורט – hebreo" lang="he" hreflang="he" data-title="עננת אורט" data-language-autonym="עברית" data-language-local-name="hebreo" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%94%E0%A4%B0%E0%A5%8D%E0%A4%9F_%E0%A4%AC%E0%A4%BE%E0%A4%A6%E0%A4%B2" title="और्ट बादल – hindi" lang="hi" hreflang="hi" data-title="और्ट बादल" 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/Oortov_oblak" title="Oortov oblak – croata" lang="hr" hreflang="hr" data-title="Oortov oblak" data-language-autonym="Hrvatski" data-language-local-name="croata" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Oort-felh%C5%91" title="Oort-felhő – húngaro" lang="hu" hreflang="hu" data-title="Oort-felhő" data-language-autonym="Magyar" data-language-local-name="húngaro" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%95%D5%B8%D6%80%D5%BF%D5%AB_%D5%A1%D5%B4%D5%BA" title="Օորտի ամպ – armenio" lang="hy" hreflang="hy" data-title="Օորտի ամպ" data-language-autonym="Հայերեն" data-language-local-name="armenio" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Awan_Oort" title="Awan Oort – indonesio" lang="id" hreflang="id" data-title="Awan Oort" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesio" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Oortsk%C3%BD" title="Oortský – islandés" lang="is" hreflang="is" data-title="Oortský" data-language-autonym="Íslenska" data-language-local-name="islandés" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Nube_di_Oort" title="Nube di Oort – italiano" lang="it" hreflang="it" data-title="Nube di Oort" data-language-autonym="Italiano" data-language-local-name="italiano" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%AA%E3%83%BC%E3%83%AB%E3%83%88%E3%81%AE%E9%9B%B2" title="オールトの雲 – xaponés" lang="ja" hreflang="ja" data-title="オールトの雲" data-language-autonym="日本語" data-language-local-name="xaponés" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/M%C3%A9ga_Oort" title="Méga Oort – xavanés" lang="jv" hreflang="jv" data-title="Méga Oort" data-language-autonym="Jawa" data-language-local-name="xavanés" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9D%E1%83%9D%E1%83%A0%E1%83%A2%E1%83%98%E1%83%A1_%E1%83%A6%E1%83%A0%E1%83%A3%E1%83%91%E1%83%94%E1%83%9A%E1%83%98" title="ოორტის ღრუბელი – xeorxiano" lang="ka" hreflang="ka" data-title="ოორტის ღრუბელი" data-language-autonym="ქართული" data-language-local-name="xeorxiano" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%8A%E0%B2%B0%E0%B3%8D%E0%B2%9F%E0%B3%8D_%E0%B2%AE%E0%B3%8B%E0%B2%A1" title="ಊರ್ಟ್ ಮೋಡ – kannará" lang="kn" hreflang="kn" data-title="ಊರ್ಟ್ ಮೋಡ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannará" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%98%A4%EB%A5%B4%ED%8A%B8_%EA%B5%AC%EB%A6%84" title="오르트 구름 – coreano" lang="ko" hreflang="ko" data-title="오르트 구름" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ksh mw-list-item"><a href="https://ksh.wikipedia.org/wiki/Oortsche_Wolke" title="Oortsche Wolke – kölsch" lang="ksh" hreflang="ksh" data-title="Oortsche Wolke" data-language-autonym="Ripoarisch" data-language-local-name="kölsch" class="interlanguage-link-target"><span>Ripoarisch</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Nubes_Oort" title="Nubes Oort – latín" lang="la" hreflang="la" data-title="Nubes Oort" data-language-autonym="Latina" data-language-local-name="latín" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Oort-Wollek" title="Oort-Wollek – luxemburgués" lang="lb" hreflang="lb" data-title="Oort-Wollek" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburgués" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Oortwolk" title="Oortwolk – limburgués" lang="li" hreflang="li" data-title="Oortwolk" data-language-autonym="Limburgs" data-language-local-name="limburgués" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Nigol_de_Oort" title="Nigol de Oort – Lombard" lang="lmo" hreflang="lmo" data-title="Nigol de Oort" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Orto_kometoid%C5%B3_debesis" title="Orto kometoidų debesis – lituano" lang="lt" hreflang="lt" data-title="Orto kometoidų debesis" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Orta_m%C4%81konis" title="Orta mākonis – letón" lang="lv" hreflang="lv" data-title="Orta mākonis" data-language-autonym="Latviešu" data-language-local-name="letón" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-map-bms mw-list-item"><a href="https://map-bms.wikipedia.org/wiki/Awan_Oort" title="Awan Oort – Banyumasan" lang="jv-x-bms" hreflang="jv-x-bms" data-title="Awan Oort" data-language-autonym="Basa Banyumasan" data-language-local-name="Banyumasan" class="interlanguage-link-target"><span>Basa Banyumasan</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9E%D1%80%D1%82%D0%BE%D0%B2_%D0%9E%D0%B1%D0%BB%D0%B0%D0%BA" title="Ортов Облак – macedonio" lang="mk" hreflang="mk" data-title="Ортов Облак" data-language-autonym="Македонски" data-language-local-name="macedonio" 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%92%E0%B5%BC%E0%B4%9F%E0%B5%8D%E0%B4%9F%E0%B5%8D_%E0%B4%AE%E0%B5%87%E0%B4%98%E0%B4%82" title="ഒർട്ട് മേഘം – malabar" lang="ml" hreflang="ml" data-title="ഒർട്ട് മേഘം" data-language-autonym="മലയാളം" data-language-local-name="malabar" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%8A%E0%A4%B0%E0%A5%8D%E0%A4%9F%E0%A4%9A%E0%A4%BE_%E0%A4%AE%E0%A5%87%E0%A4%98" title="ऊर्टचा मेघ – marathi" lang="mr" hreflang="mr" data-title="ऊर्टचा मेघ" data-language-autonym="मराठी" data-language-local-name="marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Awan_Oort" title="Awan Oort – malaio" lang="ms" hreflang="ms" data-title="Awan Oort" data-language-autonym="Bahasa Melayu" data-language-local-name="malaio" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mt mw-list-item"><a href="https://mt.wikipedia.org/wiki/S%C4%A7aba_ta%27_Oort" title="Sħaba ta' Oort – maltés" lang="mt" hreflang="mt" data-title="Sħaba ta' Oort" data-language-autonym="Malti" data-language-local-name="maltés" class="interlanguage-link-target"><span>Malti</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%B1%E1%80%AC%E1%80%90%E1%80%AD%E1%80%99%E1%80%BA%E1%80%90%E1%80%AD%E1%80%AF%E1%80%80%E1%80%BA" title="အောတိမ်တိုက် – birmano" lang="my" hreflang="my" data-title="အောတိမ်တိုက်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="birmano" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Oortsche_Wulk" title="Oortsche Wulk – baixo alemán" lang="nds" hreflang="nds" data-title="Oortsche Wulk" data-language-autonym="Plattdüütsch" data-language-local-name="baixo alemán" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Oortwolk" title="Oortwolk – neerlandés" lang="nl" hreflang="nl" data-title="Oortwolk" data-language-autonym="Nederlands" data-language-local-name="neerlandés" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Oortskya" title="Oortskya – noruegués nynorsk" lang="nn" hreflang="nn" data-title="Oortskya" data-language-autonym="Norsk nynorsk" data-language-local-name="noruegués nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Oorts_sky" title="Oorts sky – noruegués bokmål" lang="nb" hreflang="nb" data-title="Oorts sky" data-language-autonym="Norsk bokmål" data-language-local-name="noruegués bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/N%C3%ADvol_d%27Oort" title="Nívol d'Oort – occitano" lang="oc" hreflang="oc" data-title="Nívol d'Oort" data-language-autonym="Occitan" data-language-local-name="occitano" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://pl.wikipedia.org/wiki/Ob%C5%82ok_Oorta" title="Obłok Oorta – polaco" lang="pl" hreflang="pl" data-title="Obłok Oorta" data-language-autonym="Polski" data-language-local-name="polaco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A7%D9%88%D9%88%D8%B1%D9%B9_%D8%A8%D8%AF%D9%84" title="اوورٹ بدل – Western Punjabi" lang="pnb" hreflang="pnb" data-title="اوورٹ بدل" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt badge-Q17437796 badge-featuredarticle mw-list-item" title="artigo de calidade"><a href="https://pt.wikipedia.org/wiki/Nuvem_de_Oort" title="Nuvem de Oort – portugués" lang="pt" hreflang="pt" data-title="Nuvem de Oort" data-language-autonym="Português" data-language-local-name="portugués" 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/Norul_lui_Oort" title="Norul lui Oort – romanés" lang="ro" hreflang="ro" data-title="Norul lui Oort" data-language-autonym="Română" data-language-local-name="romanés" 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%9E%D0%B1%D0%BB%D0%B0%D0%BA%D0%BE_%D0%9E%D0%BE%D1%80%D1%82%D0%B0" title="Облако Оорта – ruso" lang="ru" hreflang="ru" data-title="Облако Оорта" data-language-autonym="Русский" data-language-local-name="ruso" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Nubbi_di_Oort" title="Nubbi di Oort – siciliano" lang="scn" hreflang="scn" data-title="Nubbi di Oort" data-language-autonym="Sicilianu" data-language-local-name="siciliano" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Oort_clood" title="Oort clood – escocés" lang="sco" hreflang="sco" data-title="Oort clood" data-language-autonym="Scots" data-language-local-name="escocés" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Oortov_oblak" title="Oortov oblak – serbocroata" lang="sh" hreflang="sh" data-title="Oortov oblak" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroata" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Oort_cloud" title="Oort cloud – Simple English" lang="en-simple" hreflang="en-simple" data-title="Oort cloud" 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-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Oortov_mrak_kom%C3%A9t" title="Oortov mrak komét – eslovaco" lang="sk" hreflang="sk" data-title="Oortov mrak komét" data-language-autonym="Slovenčina" data-language-local-name="eslovaco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Oortov_oblak" title="Oortov oblak – esloveno" lang="sl" hreflang="sl" data-title="Oortov oblak" data-language-autonym="Slovenščina" data-language-local-name="esloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9E%D1%80%D1%82%D0%BE%D0%B2_%D0%BE%D0%B1%D0%BB%D0%B0%D0%BA" title="Ортов облак – serbio" lang="sr" hreflang="sr" data-title="Ортов облак" data-language-autonym="Српски / srpski" data-language-local-name="serbio" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Oorts_kometmoln" title="Oorts kometmoln – sueco" lang="sv" hreflang="sv" data-title="Oorts kometmoln" data-language-autonym="Svenska" data-language-local-name="sueco" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Wingu_la_Oort" title="Wingu la Oort – suahili" lang="sw" hreflang="sw" data-title="Wingu la Oort" data-language-autonym="Kiswahili" data-language-local-name="suahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%8A%E0%B0%B0%E0%B1%8D%E0%B0%9F%E0%B1%8D_%E0%B0%AE%E0%B1%87%E0%B0%98%E0%B0%82" title="ఊర్ట్ మేఘం – telugu" lang="te" hreflang="te" data-title="ఊర్ట్ మేఘం" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%90%D0%B1%D1%80%D0%B8_%D0%BE%D0%BE%D1%80%D1%82" title="Абри оорт – taxico" lang="tg" hreflang="tg" data-title="Абри оорт" data-language-autonym="Тоҷикӣ" data-language-local-name="taxico" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A1%E0%B8%86%E0%B8%AD%E0%B8%AD%E0%B8%A3%E0%B9%8C%E0%B8%95" title="เมฆออร์ต – tailandés" lang="th" hreflang="th" data-title="เมฆออร์ต" data-language-autonym="ไทย" data-language-local-name="tailandés" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Ulap_na_Oort" title="Ulap na Oort – tagalo" lang="tl" hreflang="tl" data-title="Ulap na Oort" data-language-autonym="Tagalog" data-language-local-name="tagalo" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Oort_bulutu" title="Oort bulutu – turco" lang="tr" hreflang="tr" data-title="Oort bulutu" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%9E%D0%BE%D1%80%D1%82_%D0%B1%D0%BE%D0%BB%D1%8B%D1%82%D1%8B" title="Оорт болыты – tártaro" lang="tt" hreflang="tt" data-title="Оорт болыты" data-language-autonym="Татарча / tatarça" data-language-local-name="tártaro" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A5%D0%BC%D0%B0%D1%80%D0%B0_%D0%9E%D0%BE%D1%80%D1%82%D0%B0" title="Хмара Оорта – ucraíno" lang="uk" hreflang="uk" data-title="Хмара Оорта" data-language-autonym="Українська" data-language-local-name="ucraíno" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%A7%D9%88%D8%B1%D8%AA_%D8%A8%D8%A7%D8%AF%D9%84" title="اورت بادل – urdú" lang="ur" hreflang="ur" data-title="اورت بادل" data-language-autonym="اردو" data-language-local-name="urdú" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Oort_buluti" title="Oort buluti – uzbeko" lang="uz" hreflang="uz" data-title="Oort buluti" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbeko" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/Nube_de_Oort" title="Nube de Oort – Venetian" lang="vec" hreflang="vec" data-title="Nube de Oort" data-language-autonym="Vèneto" data-language-local-name="Venetian" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/%C4%90%C3%A1m_m%C3%A2y_Oort" title="Đám mây Oort – vietnamita" lang="vi" hreflang="vi" data-title="Đám mây Oort" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Dampog_Oort" title="Dampog Oort – waray-waray" lang="war" hreflang="war" data-title="Dampog Oort" data-language-autonym="Winaray" data-language-local-name="waray-waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%A5%A5%E5%B0%94%E7%89%B9%E4%BA%91" title="奥尔特云 – chinés wu" lang="wuu" hreflang="wuu" data-title="奥尔特云" data-language-autonym="吴语" data-language-local-name="chinés wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%9D%E1%83%9D%E1%83%A0%E1%83%A2%E1%83%90%E1%83%A8_%E1%83%9B%E1%83%A3%E1%83%9C%E1%83%90%E1%83%A4%E1%83%90" title="ოორტაშ მუნაფა – 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de calidade da Galipedia" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Fairytale_bookmark_gold.svg/20px-Fairytale_bookmark_gold.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Fairytale_bookmark_gold.svg/30px-Fairytale_bookmark_gold.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/66/Fairytale_bookmark_gold.svg/40px-Fairytale_bookmark_gold.svg.png 2x" data-file-width="100" data-file-height="100" /></a></span></div></div> </div> <div id="siteSub" class="noprint">Na Galipedia, a Wikipedia en galego.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="gl" dir="ltr"><p class="mw-empty-elt"> </p> <div class="dablink">Este artigo trata sobre a nube de Oort exterior. Para a nube de Oort interior véxase: <a href="/w/index.php?title=Nube_de_Hills&action=edit&redlink=1" class="new" title="Nube de Hills (a páxina aínda non existe)">Nube de Hills</a>.</div> <div class="thumb tright" style="width:312px;"> <div class="thumbinner"> <div style="margin:1px;width:302px;"><div class="thumbimage"><span typeof="mw:File"><a href="/wiki/Ficheiro:PIA17046_-_Voyager_1_Goes_Interstellar.jpg" class="mw-file-description" title="Gráfico que amosa a distancia a escala logarítmica da Nube de Oort co resto do Sistema Solar e dúas das estrelas máis próximas, medido en unidades astronómicas. A frecha vermella indica a posición aproximada da sonda Voyager 1."><img alt="Gráfico que amosa a distancia a escala logarítmica da Nube de Oort co resto do Sistema Solar e dúas das estrelas máis próximas, medido en unidades astronómicas. A frecha vermella indica a posición aproximada da sonda Voyager 1." src="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/PIA17046_-_Voyager_1_Goes_Interstellar.jpg/300px-PIA17046_-_Voyager_1_Goes_Interstellar.jpg" decoding="async" width="300" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/PIA17046_-_Voyager_1_Goes_Interstellar.jpg/450px-PIA17046_-_Voyager_1_Goes_Interstellar.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/da/PIA17046_-_Voyager_1_Goes_Interstellar.jpg/600px-PIA17046_-_Voyager_1_Goes_Interstellar.jpg 2x" data-file-width="5432" data-file-height="3025" /></a></span></div><div class="thumbcaption" style="clear:left;text-align:left">Gráfico que amosa a distancia a <a href="/w/index.php?title=Escala_logar%C3%ADtmica&action=edit&redlink=1" class="new" title="Escala logarítmica (a páxina aínda non existe)">escala logarítmica</a> da Nube de Oort co resto do <a href="/wiki/Sistema_Solar" class="mw-redirect" title="Sistema Solar">Sistema Solar</a> e dúas das estrelas máis próximas, medido en <a href="/wiki/Unidades_astron%C3%B3micas" class="mw-redirect" title="Unidades astronómicas">unidades astronómicas</a>. A frecha vermella indica a posición aproximada da sonda <a href="/wiki/Voyager_1" title="Voyager 1">Voyager 1</a>.</div></div> <div style="margin:1px;width:302px;"><div class="thumbimage"><span typeof="mw:File"><a href="/wiki/Ficheiro:Kuiper_belt_-_Oort_cloud-en.svg" class="mw-file-description" title="Representación artística da Nube de Oort e do Cinto de Kuiper."><img alt="Representación artística da Nube de Oort e do Cinto de Kuiper." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/56/Kuiper_belt_-_Oort_cloud-en.svg/300px-Kuiper_belt_-_Oort_cloud-en.svg.png" decoding="async" width="300" height="257" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/56/Kuiper_belt_-_Oort_cloud-en.svg/450px-Kuiper_belt_-_Oort_cloud-en.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/56/Kuiper_belt_-_Oort_cloud-en.svg/600px-Kuiper_belt_-_Oort_cloud-en.svg.png 2x" data-file-width="512" data-file-height="439" /></a></span></div><div class="thumbcaption" style="clear:left;text-align:left">Representación artística da Nube de Oort e do <a href="/wiki/Cinto_de_Kuiper" title="Cinto de Kuiper">Cinto de Kuiper</a>.</div></div> </div></div> <p>A <b>Nube de Oort</b>, nomeada polo astrónomo neerlandés <a href="/w/index.php?title=Jan_Oort&action=edit&redlink=1" class="new" title="Jan Oort (a páxina aínda non existe)">Jan Oort</a> e en ocasións chamada a <b>Nube de Öpik–Oort</b>,<sup id="cite_ref-Whipple_1-0" class="reference"><a href="#cite_note-Whipple-1"><span>[</span>1<span>]</span></a></sup> é unha nube <a href="/wiki/Teor%C3%ADa_cient%C3%ADfica" title="Teoría científica">teórica</a> que estaría predominantemente composta de <a href="/wiki/Planetesimal" title="Planetesimal">planetesimais</a> <a href="/w/index.php?title=Vol%C3%A1til_(astronom%C3%ADa&action=edit&redlink=1" class="new" title="Volátil (astronomía (a páxina aínda non existe)">volátiles</a> que arrodearía ó <a href="/wiki/Sol" title="Sol">Sol</a> a unha distancia de entre as 2 000 e as 200 000 <a href="/wiki/Unidade_astron%C3%B3mica" title="Unidade astronómica">UA</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span>[</span>a<span>]</span></a></sup><sup id="cite_ref-Morbidelli2006_2-1" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> A súa existencia postulouna por primeira vez o astrónomo estoniano <a href="/wiki/Ernst_%C3%96pik" title="Ernst Öpik">Ernst Öpik</a> no ano <a href="/wiki/1932" title="1932">1932</a>.<sup id="cite_ref-Öpik-1932_4-0" class="reference"><a href="#cite_note-Öpik-1932-4"><span>[</span>3<span>]</span></a></sup> Divídese en dúas rexións: unha Nube interior de Oort en <a href="/wiki/Disco_circunestelar" title="Disco circunestelar">forma de disco</a> coñecida como <a href="/w/index.php?title=Nube_de_Hills&action=edit&redlink=1" class="new" title="Nube de Hills (a páxina aínda non existe)">Nube de Hills</a>, e unha Nube de Oort exterior <a href="/w/index.php?title=Cuberta_circunestelar&action=edit&redlink=1" class="new" title="Cuberta circunestelar (a páxina aínda non existe)">esférica</a>. Ámbalas dúas rexións atoparíanse máis aló da <a href="/wiki/Heliosfera" title="Heliosfera">heliosfera</a>, no <a href="/wiki/Espazo_exterior" title="Espazo exterior">espazo interestelar</a>.<sup id="cite_ref-Morbidelli2006_2-2" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup><sup id="cite_ref-jpl.PIA17046_5-0" class="reference"><a href="#cite_note-jpl.PIA17046-5"><span>[</span>4<span>]</span></a></sup> En comparación, o <a href="/wiki/Cinto_de_Kuiper" title="Cinto de Kuiper">Cinto de Kuiper</a> e o <a href="/wiki/Disco_disperso" title="Disco disperso">disco disperso</a>, os outros dous depósitos de <a href="/wiki/Obxecto_transneptuniano" title="Obxecto transneptuniano">obxectos transneptunianos</a>, atópanse a menos dunha milésima parte de distancia do Sol que a Nube de Oort. </p><p>O límite exterior da Nube de Oort define o límite <a href="/w/index.php?title=Cosmograf%C3%ADa&action=edit&redlink=1" class="new" title="Cosmografía (a páxina aínda non existe)">cosmográfico</a> do <a href="/wiki/Sistema_Solar" class="mw-redirect" title="Sistema Solar">Sistema Solar</a> e a extensión da <a href="/w/index.php?title=Esfera_de_Hill&action=edit&redlink=1" class="new" title="Esfera de Hill (a páxina aínda non existe)">esfera de Hill</a> do Sol.<sup id="cite_ref-NASA_SSE_oort_6-0" class="reference"><a href="#cite_note-NASA_SSE_oort-6"><span>[</span>5<span>]</span></a></sup> A Nube exterior de Oort tería unha débil ligazón co Sistema Solar, e veríase doadamente afectada polo pulo gravitacional de estrelas próximas e da propia <a href="/wiki/V%C3%ADa_L%C3%A1ctea" title="Vía Láctea">Vía Láctea</a>. Estas forzas serían as que ocasionalmente extraerían <a href="/wiki/Cometa" title="Cometa">cometas</a> das súas orbitas dentro da nube, enviándoos cara ao <a href="/w/index.php?title=Sistema_Solar_interior&action=edit&redlink=1" class="new" title="Sistema Solar interior (a páxina aínda non existe)">Sistema Solar interior</a>.<sup id="cite_ref-Morbidelli2006_2-3" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> Baseándose nas súas <a href="/wiki/%C3%93rbita" title="Órbita">órbitas</a>, a maioría dos <a href="/w/index.php?title=Cometa_de_per%C3%ADodo_curto&action=edit&redlink=1" class="new" title="Cometa de período curto (a páxina aínda non existe)">cometas de período curto</a> procederían do disco disperso, máis algúns destes poderían ter a súa orixe na Nube de Oort.<sup id="cite_ref-Morbidelli2006_2-4" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup><sup id="cite_ref-emel2007_7-0" class="reference"><a href="#cite_note-emel2007-7"><span>[</span>6<span>]</span></a></sup> </p><p>Os astrónomos conxecturaron que a materia que compoñería a Nube de Oort estaría formada preto do Sol e posteriormente quedaría espallada lonxe no espazo por mor dos efectos gravitacionais dos <a href="/w/index.php?title=Planetas_xigantes&action=edit&redlink=1" class="new" title="Planetas xigantes (a páxina aínda non existe)">planetas xigantes</a> nos comezos da <a href="/wiki/Formaci%C3%B3n_e_evoluci%C3%B3n_do_Sistema_Solar" class="mw-redirect" title="Formación e evolución do Sistema Solar">evolución do Sistema Solar</a>.<sup id="cite_ref-Morbidelli2006_2-5" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> Malia que non se realizaron observacións directas confirmadas da Nube de Oort, considérase que esta podería ser a fonte dos cometas de <a href="/w/index.php?title=Cometa_de_per%C3%ADodo_longo&action=edit&redlink=1" class="new" title="Cometa de período longo (a páxina aínda non existe)">período longo</a> e de <a href="/wiki/Cometa_Halley" title="Cometa Halley">tipo Halley</a> que se adentran no Sistema Solar, así como de moitos dos cometas <a href="/wiki/Centauro_(astronom%C3%ADa)" title="Centauro (astronomía)">centauros</a> e da familia de <a href="/wiki/X%C3%BApiter" title="Xúpiter">Xúpiter</a>.<sup id="cite_ref-emel2007_7-1" class="reference"><a href="#cite_note-emel2007-7"><span>[</span>6<span>]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Hipótese"><span id="Hip.C3.B3tese"></span>Hipótese</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=1" title="Editar a sección: «Hipótese»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=1" title="Editar o código fonte da sección: Hipótese"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Existen dúas clases principais de <a href="/wiki/Cometa" title="Cometa">cometas</a>: os de período curto (tamén chamados cometas elípticos) e os de período longo (tamén chamados cometas case isotrópicos). Os cometas elípticos teñen órbitas relativamente pequenas, de menos de 10 UA, e seguen o <a href="/wiki/Ecl%C3%ADptica" title="Eclíptica">plano da eclíptica</a>, o mesmo no que se atopan os planetas. Tódolos cometas de período longo teñen órbitas moi grandes, da orde de miles de UA, e preséntanse en tódalas direccións do espazo.<sup id="cite_ref-book_8-0" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> </p><p><a href="/w/index.php?title=A._O._Leuschner&action=edit&redlink=1" class="new" title="A. O. Leuschner (a páxina aínda non existe)">A. O. Leuschner</a> suxeriu en <a href="/wiki/1907" title="1907">1907</a> que moitos cometas dos que se cría que tiñan órbitas parabólicas, e que polo tanto pasarían unha única vez polo Sistema Solar, realmente tiñan órbitas elípticas e retornarían tras longos períodos de tempo.<sup id="cite_ref-ley1967204_9-0" class="reference"><a href="#cite_note-ley1967204-9"><span>[</span>8<span>]</span></a></sup> En <a href="/wiki/1932" title="1932">1932</a> o astrónomo estoniano <a href="/wiki/Ernst_%C3%96pik" title="Ernst Öpik">Ernst Öpik</a> postulou que os cometas de período longo tiñan a súa orixe nunha nube orbital no límite máis exterior do <a href="/wiki/Sistema_Solar" class="mw-redirect" title="Sistema Solar">Sistema Solar</a>.<sup id="cite_ref-Öpik-1932_4-1" class="reference"><a href="#cite_note-Öpik-1932-4"><span>[</span>3<span>]</span></a></sup> O astrónomo holandés <a href="/w/index.php?title=Jan_Oort&action=edit&redlink=1" class="new" title="Jan Oort (a páxina aínda non existe)">Jan Oort</a> reviviu esta idea de forma independente no ano <a href="/wiki/1950" title="1950">1950</a> como método para resolver un <a href="/wiki/Paradoxo" title="Paradoxo">paradoxo</a>:<sup id="cite_ref-Oort_10-0" class="reference"><a href="#cite_note-Oort-10"><span>[</span>9<span>]</span></a></sup> </p> <ul><li>Durante o curso da existencia do Sistema Solar, as órbitas dos cometas son inestables e eventualmente a <a href="/wiki/Din%C3%A1mica" title="Dinámica">dinámica</a> dita que un cometa debe ou ben colidir co Sol ou cun planeta, ou ben ser expulsado do Sistema Solar por mor das <a href="/w/index.php?title=Perturbaci%C3%B3n_(astronom%C3%ADa)&action=edit&redlink=1" class="new" title="Perturbación (astronomía) (a páxina aínda non existe)">perturbacións planetarias</a>.</li> <li>Ademais, a súa composición volátil implica que segundo se achegan repetidamente ó Sol, a <a href="/wiki/Radiaci%C3%B3n_electromagn%C3%A9tica" title="Radiación electromagnética">radiación</a> elimina gradualmente os volátiles ata que o cometa se divide ou desenvolve unha codia illante que prevén a súa <a href="/wiki/Desgasificaci%C3%B3n" title="Desgasificación">desgasificación</a>.</li></ul> <p>Partindo disto Oort razoou que un cometa non podería terse formado mentres estaba na súa propia órbita, e debía terse mantido nun depósito exterior no que tería permanecido durante case toda a súa existencia.<sup id="cite_ref-Oort_10-1" class="reference"><a href="#cite_note-Oort-10"><span>[</span>9<span>]</span></a></sup><sup id="cite_ref-dave_11-0" class="reference"><a href="#cite_note-dave-11"><span>[</span>10<span>]</span></a></sup><sup id="cite_ref-book_8-1" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> Oort indicou que había un pico no número de cometas de longo período observados con <a href="/wiki/Apse" title="Apse">afelios</a> de aproximadamente 20 000 UA, o que suxería a existencia dun depósito a esta distancia cunha distribución esférica e isotrópica. Estes cometas relativamente raros con órbitas dunhas 10 000 UA terían pasado probablemente a través dunha ou máis órbitas do Sistema Solar, e as súas órbitas estaríanse movendo cara ao interior por mor da <a href="/wiki/Gravidade" title="Gravidade">gravidade</a> dos planetas.<sup id="cite_ref-book_8-2" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Estrutura_e_composición"><span id="Estrutura_e_composici.C3.B3n"></span>Estrutura e composición</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=2" title="Editar a sección: «Estrutura e composición»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=2" title="Editar o código fonte da sección: Estrutura e composición"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Ficheiro:Oort_cloud_Sedna_orbit.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Oort_cloud_Sedna_orbit.svg/280px-Oort_cloud_Sedna_orbit.svg.png" decoding="async" width="280" height="280" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Oort_cloud_Sedna_orbit.svg/420px-Oort_cloud_Sedna_orbit.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Oort_cloud_Sedna_orbit.svg/560px-Oort_cloud_Sedna_orbit.svg.png 2x" data-file-width="2499" data-file-height="2499" /></a><figcaption>Distancia da Nube de Oort en comparación co resto do Sistema Solar</figcaption></figure> <p>A Nube de Oort ocuparía un grande espazo comezando entre as 2 000 e 5 000 UA<sup id="cite_ref-book_8-3" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> do Sol e chegando ata as 50 000 UA do mesmo.<sup id="cite_ref-Morbidelli2006_2-6" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> Algunhas estimacións sitúan o seu límite exterior entre as 100 000 e as 200 000 UA.<sup id="cite_ref-book_8-4" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> Esta rexión subdivídese nunha Nube de Oort esférica exterior de entre 20 000 e 50 000 UA, e unha Nube de Oort interior con forma de <a href="/wiki/Toro_(xeometr%C3%ADa_e_topolox%C3%ADa)" title="Toro (xeometría e topoloxía)">toro</a> de entre 2 000 e 20 000 UA. A nube exterior só estaría ligada de forma débil ó Sol e sería fonte de cometas de longo período para a órbita interior de <a href="/wiki/Neptuno" title="Neptuno">Neptuno</a>.<sup id="cite_ref-Morbidelli2006_2-7" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> A nube interior tamén se coñece como <a href="/w/index.php?title=Nube_de_Hills&action=edit&redlink=1" class="new" title="Nube de Hills (a páxina aínda non existe)">Nube de Hills</a>, nomeada por <a href="/w/index.php?title=Jack_G._Hills&action=edit&redlink=1" class="new" title="Jack G. Hills (a páxina aínda non existe)">Jack G. Hills</a>, quen propuxo a súa existencia en 1981.<sup id="cite_ref-hills1981_12-0" class="reference"><a href="#cite_note-hills1981-12"><span>[</span>11<span>]</span></a></sup> Os modelos predín que a nube interior debería ter decenas ou centos de veces máis núcleos de cometas que o halo exterior,<sup id="cite_ref-hills1981_12-1" class="reference"><a href="#cite_note-hills1981-12"><span>[</span>11<span>]</span></a></sup><sup id="cite_ref-levison2001_13-0" class="reference"><a href="#cite_note-levison2001-13"><span>[</span>12<span>]</span></a></sup><sup id="cite_ref-Donahue1991_14-0" class="reference"><a href="#cite_note-Donahue1991-14"><span>[</span>13<span>]</span></a></sup> e sería unha posible fonte de novos cometas para a nube exterior segundo se van reducindo os desta. A Nube de Hills explica a existencia continua da Nube de Oort tras miles de millóns de anos.<sup id="cite_ref-Julio1997_15-0" class="reference"><a href="#cite_note-Julio1997-15"><span>[</span>14<span>]</span></a></sup> </p><p>A Nube exterior de Oort podería conter billóns de obxectos de máis de entre 1 e 2 <a href="/wiki/Quil%C3%B3metro" title="Quilómetro">km</a> de diámetro,<sup id="cite_ref-Morbidelli2006_2-8" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> e miles de millóns de obxectos con <a href="/wiki/Magnitude_absoluta" title="Magnitude absoluta">magnitudes absolutas</a> máis brillantes ca 11 (correspondéndose a aproximadamente uns 20 km de diámetro), con obxectos veciños a decenas de millóns de quilómetros de distancia.<sup id="cite_ref-emel2007_7-2" class="reference"><a href="#cite_note-emel2007-7"><span>[</span>6<span>]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span>[</span>15<span>]</span></a></sup> Descoñécese a súa masa total, mais asumindo que o <a href="/wiki/Cometa_Halley" title="Cometa Halley">cometa Halley</a> é un prototipo axeitado para os cometas da Nube exterior de Oort, a súa masa combinada sería de aproximadamente 3<sup>25</sup> kg, ou de forma equivalente, unhas cinco veces a masa da <a href="/wiki/Terra" title="Terra">Terra</a>.<sup id="cite_ref-Morbidelli2006_2-9" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span>[</span>16<span>]</span></a></sup> Inicialmente críase que sería máis masiva, chegando ata 380 veces a masa da Terra, mais a mellora no coñecemento da distribución de tamaños nos cometas de período longo deu lugar a estimacións máis baixas.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span>[</span>17<span>]</span></a></sup> </p><p>Considerando que a análise de cometas é representativa do conxunto, a gran maioría dos obxectos da Nube de Oort estarían compostos de <a href="/w/index.php?title=Vol%C3%A1til_(astronom%C3%ADa)&action=edit&redlink=1" class="new" title="Volátil (astronomía) (a páxina aínda non existe)">volátiles</a> como <a href="/wiki/Xeo" title="Xeo">auga</a>, <a href="/wiki/Metano" title="Metano">metano</a>, <a href="/wiki/Etano" title="Etano">etano</a>, <a href="/wiki/Mon%C3%B3xido_de_carbono" title="Monóxido de carbono">monóxido de carbono</a> e <a href="/wiki/Cianuro_de_hidr%C3%B3xeno" title="Cianuro de hidróxeno">cianuro de hidróxeno</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span>[</span>18<span>]</span></a></sup> Porén, o descubrimento do obxecto <span style="white-space:nowrap"><a href="/w/index.php?title=1996_PW&action=edit&redlink=1" class="new" title="1996 PW (a páxina aínda non existe)">1996 PW</a></span>, cunha aparencia consistente coa dun <a href="/w/index.php?title=Asteroide_tipo_D&action=edit&redlink=1" class="new" title="Asteroide tipo D (a páxina aínda non existe)">asteroide tipo D</a><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span>[</span>19<span>]</span></a></sup><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span>[</span>20<span>]</span></a></sup> nunha órbita típica dun cometa de período longo, deu lugar á unha investigación teórica que suxire que a poboación da Nube de Oort está composta de aproximadamente entre o 1% e o 2% de asteroides.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span>[</span>21<span>]</span></a></sup> A análise das proporcións de <a href="/wiki/Is%C3%B3topo" title="Isótopo">isótopos</a> de <a href="/wiki/Carbono" title="Carbono">carbono</a> e <a href="/wiki/Hidr%C3%B3xeno" title="Hidróxeno">hidróxeno</a> tanto nos cometas de período longo coma nos da familia Xúpiter demostra poucas diferenzas entre os dous tipos, malia a presunta grande separación entre as dúas rexións de orixe. Isto suxire que ámbolos dous tipos teñen a súa orixe na mesma nube protosolar orixinal,<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span>[</span>22<span>]</span></a></sup> conclusión apoiada tamén polos estudos de tamaño granular nos cometas da Nube de Oort<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span>[</span>23<span>]</span></a></sup> e polo estudo de impacto do cometa <a href="/w/index.php?title=Tempel_1&action=edit&redlink=1" class="new" title="Tempel 1 (a páxina aínda non existe)">Tempel 1</a> da familia Xúpiter.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span>[</span>24<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Orixe">Orixe</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=3" title="Editar a sección: «Orixe»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=3" title="Editar o código fonte da sección: Orixe"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Crese que a Nube de Oort sería un remanente do <a href="/w/index.php?title=Disco_protoplanetario&action=edit&redlink=1" class="new" title="Disco protoplanetario (a páxina aínda non existe)">disco protoplanetario</a> orixinal que se <a href="/wiki/Formaci%C3%B3n_e_evoluci%C3%B3n_do_Sistema_Solar" class="mw-redirect" title="Formación e evolución do Sistema Solar">formou ó redor do Sol</a> hai aproximadamente 4 600 millóns de anos.<sup id="cite_ref-Morbidelli2006_2-10" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> A hipótese de maior aceptación indica que os obxectos da Nube de Oort fusionáronse moito máis preto do Sol como parte do mesmo proceso que formou os <a href="/wiki/Planeta" title="Planeta">planetas</a> e os <a href="/wiki/Planetoide" title="Planetoide">planetas menores</a>, pero as interaccións gravitacionais con <a href="/wiki/Xigante_gasoso" title="Xigante gasoso">xigantes gasosos</a> como <a href="/wiki/X%C3%BApiter" title="Xúpiter">Xúpiter</a> expulsaron ós obxectos cara a órbitas elípticas ou <a href="/w/index.php?title=%C3%93rbita_parab%C3%B3lica&action=edit&redlink=1" class="new" title="Órbita parabólica (a páxina aínda non existe)">parabólicas</a> extremadamente amplas.<sup id="cite_ref-Morbidelli2006_2-11" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> A <a href="/wiki/NASA" title="NASA">NASA</a> citou unha investigación máis recente na que se presenta a hipótese de que os obxectos máis grandes da Nube de Oort son produto dun intercambio de materiais entre o Sol e as súas estrelas irmás durante a súa formación e separación, e suxeriuse que moitos destes obxectos non se formaron nas proximidades do Sol.<sup id="cite_ref-nasax_26-0" class="reference"><a href="#cite_note-nasax-26"><span>[</span>25<span>]</span></a></sup> As simulacións da evolución da Nube de Oort dende os comezos da formación do Sistema Solar suxiren que a masa da nube acadou o seu máximo ó redor duns 800 millóns de anos trala súa formación, momento no que a velocidade de acrecentamento e colisión se reduciu e o esgotamento comezou a ser maior que a subministración.<sup id="cite_ref-Morbidelli2006_2-12" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> </p><p>Os modelos presentados en 2004 por <a href="/wiki/Julio_%C3%81ngel_Fern%C3%A1ndez" title="Julio Ángel Fernández">Julio Ángel Fernández</a> suxiren que o <a href="/wiki/Disco_disperso" title="Disco disperso">disco disperso</a>, a principal fonte de <a href="/w/index.php?title=Cometa_peri%C3%B3dico&action=edit&redlink=1" class="new" title="Cometa periódico (a páxina aínda non existe)">cometas periódicos</a> no Sistema Solar, podería ser tamén a fonte principal dos obxectos da Nube de Oort. Segundo estes modelos, ó redor da metade dos obxectos espallados viaxan cara á fora do Sistema Solar en dirección da Nube de Oort, un cuarto deles mudan a traxectoria cara ó interior, cara á órbita de Xúpiter, e os obxectos restantes son expulsados seguindo órbitas hiperbólicas. Esta hipótese indica que o disco disperso aínda estaría fornecendo material á Nube de Oort.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span>[</span>26<span>]</span></a></sup> Segundo Davies e Barrera, un terzo da poboación de obxectos do disco disperso acabará probablemente na Nube de Oort pasados uns 2 500 millóns de anos.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span>[</span>27<span>]</span></a></sup> </p><p>Outros modelos matemáticos suxiren que as colisións de restos de cometas durante o período de formación tiveron un papel máis importante. Segundo estes modelos, o número de colisións temperás na historia do Sistema Solar foi moi elevado, provocando que a maioría de cometas quedasen destruídos antes de chegar á Nube de Oort. Por mor disto a masa acumulativa da Nube de Oort sería moito menor do que se estimou inicialmente.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span>[</span>28<span>]</span></a></sup> A masa estimada da nube sería de tan só unha pequena parte do material expulsado, de entre 50 e 100 veces a masa da Terra.<sup id="cite_ref-Morbidelli2006_2-13" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> </p><p>A interacción gravitacional coas estrelas próximas e o efecto das <a href="/w/index.php?title=Marea_gal%C3%A1ctica&action=edit&redlink=1" class="new" title="Marea galáctica (a páxina aínda non existe)">mareas galácticas</a> modificaron as órbitas dos cometas facéndoas máis circulares, o que explica a forma esférica atribuída á Nube exterior de Oort.<sup id="cite_ref-Morbidelli2006_2-14" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> Por outra banda, a Nube de Hills, ligada de forma máis forte ó Sol, non adquiriu esta forma esférica. Os estudos máis recentes indican que a formación da Nube de Oort é compatible coa hipótese de que o Sistema Solar se formou como parte dun <a href="/wiki/C%C3%BAmulo_estelar" title="Cúmulo estelar">cúmulo estelar</a> incrustado formado por entre 200 e 400 estrelas. Estas estrelas temperás tiveron probablemente un papel na formación da nube, xa que o número de camiños estelares próximos dentro do cúmulo sería moito maior que o actual, dando lugar a perturbacións máis frecuentes.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span>[</span>29<span>]</span></a></sup> </p><p>En xuño de 2010, <a href="/w/index.php?title=Harold_F._Levison&action=edit&redlink=1" class="new" title="Harold F. Levison (a páxina aínda non existe)">Harold F. Levison</a> suxeriu, baseándose en simulacións por computadora melloradas, que o Sol capturou cometas doutras estrelas mentres se atopaba no seu <a href="/wiki/C%C3%BAmulo_aberto" title="Cúmulo aberto">cúmulo de nacemento</a>. Os resultados obtidos con estas simulacións implicarían que unha importante fracción dos cometas da Nube de Oort, que podería exceder o 90% dos mesmos, terían a súa orixe nos discos protoplanetarios doutras estrelas.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span>[</span>30<span>]</span></a></sup><sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span>[</span>31<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Cometas">Cometas</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=4" title="Editar a sección: «Cometas»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=4" title="Editar o código fonte da sección: Cometas"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Ficheiro:Comet_Hale-Bopp.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Comet_Hale-Bopp.jpg/170px-Comet_Hale-Bopp.jpg" decoding="async" width="170" height="243" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Comet_Hale-Bopp.jpg/255px-Comet_Hale-Bopp.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Comet_Hale-Bopp.jpg/340px-Comet_Hale-Bopp.jpg 2x" data-file-width="1200" data-file-height="1713" /></a><figcaption>O <a href="/w/index.php?title=Cometa_Hale%E2%80%93Bopp&action=edit&redlink=1" class="new" title="Cometa Hale–Bopp (a páxina aínda non existe)">cometa Hale–Bopp</a>, arquetipo de cometa da Nube de Oort</figcaption></figure> <p>Considérase que os <a href="/wiki/Cometa" title="Cometa">cometas</a> teñen dous puntos de orixe separados no Sistema Solar. Os cometas de período curto (aqueles con órbitas de ata 200 anos) terían a súa orixe ou ben no <a href="/wiki/Cinto_de_Kuiper" title="Cinto de Kuiper">cinto de Kuiper</a> ou ben no <a href="/wiki/Disco_disperso" title="Disco disperso">disco disperso</a>, que se sitúan máis aló da órbita de <a href="/wiki/Neptuno" title="Neptuno">Neptuno</a> a 30 UA e esténdense conxuntamente ata máis de 100 UA do Sol. Os cometas de período longo, como o <a href="/wiki/Cometa_Hale-Bopp" title="Cometa Hale-Bopp">cometa Hale–Bopp</a>, con órbitas de miles de anos, terían a súa orixe na Nube de Oort.<sup id="cite_ref-book_8-5" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span>[</span>32<span>]</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span>[</span>33<span>]</span></a></sup> </p><p>Existen dúas variedades principais de cometas de período curto: os cometas da familia de Xúpiter con <a href="/wiki/Semieixo_maior" title="Semieixo maior">semieixos maiores</a> de menos de 5 UA, e os cometas da familia Halley. Estes últimos, nomeados polo seu prototipo o <a href="/wiki/Cometa_Halley" title="Cometa Halley">cometa Halley</a>, son pouco habituais xa que malia ser cometas de período curto, as hipóteses indican que a súa orixe estaría dentro da Nube de Oort e non no disco disperso. Baseándose nas súas órbitas, considérase que estes cometas foron inicialmente cometas de período longo capturados pola gravidade dos planetas xigantes e enviados cara ó interior do Sistema Solar.<sup id="cite_ref-dave_11-1" class="reference"><a href="#cite_note-dave-11"><span>[</span>10<span>]</span></a></sup> Este proceso podería ter creado tamén as órbitas presentes dunha fracción significativa dos cometas da familia de Xúpiter, malia que se considera que a maioría destes cometas orixináronse no disco disperso.<sup id="cite_ref-emel2007_7-3" class="reference"><a href="#cite_note-emel2007-7"><span>[</span>6<span>]</span></a></sup> </p><p>Oort indicou que o número de comentas que retornaban era moito menor do que predicía o seu modelo, un feito coñecido como "esvaecemento de cometas" que non está resolto. Non se coñecen procesos dinámicos que expliquen o menor número de cometas observados en comparación coa estimación de Oort. As hipóteses existentes para explicar esta discrepancia inclúen a posible destrución dos cometas por mor do estrés das mareas, os impactos ou o quecemento, a perda de tódolos volátiles do cometa provocando que se volvan invisibles, ou a formación dun manto non volátil na superficie dos mesmos.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span>[</span>34<span>]</span></a></sup> Os estudos dinámicos dos hipotéticos cometas da Nube de Oort estimaron que a súa ocorrencia na rexión dos <a href="/wiki/Planetas_exteriores" class="mw-redirect" title="Planetas exteriores">planetas exteriores</a> sería varias veces maior que na rexión de planetas interiores. Esta discrepancia podería deberse á atracción gravitacional de Xúpiter, que actuaría en forma de barreira atrapando os cometas e provocando a súa colisión, como sucedeu co <a href="/w/index.php?title=Cometa_Shoemaker%E2%80%93Levy_9&action=edit&redlink=1" class="new" title="Cometa Shoemaker–Levy 9 (a páxina aínda non existe)">cometa Shoemaker–Levy 9</a> en 1994.<sup id="cite_ref-julio_36-0" class="reference"><a href="#cite_note-julio-36"><span>[</span>35<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Efectos_de_marea">Efectos de marea</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=5" title="Editar a sección: «Efectos de marea»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=5" title="Editar o código fonte da sección: Efectos de marea"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="detail principal"> <dl><dd><span><span><i>Artigo principal</i><i>:</i> <a href="/w/index.php?title=Marea_gal%C3%A1ctica&action=edit&redlink=1" class="new" title="Marea galáctica (a páxina aínda non existe)">Marea galáctica</a>.</span></span></dd></dl></div> <p>A maioría dos cometas divisados preto do Sol semellan ter chegado as súas posicións debido a unha perturbación gravitacional da Nube de Oort provocada pola <a href="/w/index.php?title=Forza_de_marea&action=edit&redlink=1" class="new" title="Forza de marea (a páxina aínda non existe)">forza de marea</a> exercida pola propia <a href="/wiki/V%C3%ADa_L%C3%A1ctea" title="Vía Láctea">Vía Láctea</a>. A marea galáctica distorsiona as órbitas dos corpos presentes na parte máis exterior do Sistema Solar. Nas rexións xa trazadas do Sistema Solar, estes efectos son insignificantes en comparación coa gravidade do propio Sol, pero nas rexións máis exteriores do sistema a gravidade do Sol é máis débil e o gradiente do campo gravitacional da Vía Láctea ten efectos máis notables. As forzas de marea galáctica estiran a nube ó longo dun eixo dirixido cara ó centro da galaxia e comprímeno ó longo dos outros dous eixos. Estas pequenas perturbacións poden alterar as órbitas dentro da Nube de Oort facendo que os obxectos se acheguen máis ó Sol.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span>[</span>36<span>]</span></a></sup> O punto no que a gravidade do Sol cede a súa influencia á marea galáctica denomínase o radio de truncado de marea. Este sitúase a un radio de entre 100 000 e 200 000 UA, e marca o límite exterior da Nube de Oort.<sup id="cite_ref-book_8-6" class="reference"><a href="#cite_note-book-8"><span>[</span>7<span>]</span></a></sup> </p><p>Algúns investigadores postularon a teoría de que a marea galáctica podería ter contribuído á formación da Nube de Oort incrementando o <a href="/wiki/Apse" title="Apse">perihelio</a> dos <a href="/wiki/Planetesimal" title="Planetesimal">planetesimais</a> con grandes afelios.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span>[</span>37<span>]</span></a></sup> Os efectos da marea galáctica son complexos e dependen en gran medida do comportamento dos obxectos individuais dentro dun sistema planetario. Porén, de forma acumulativa o seu efecto pode chegar a ser significativo, e ata un 90% de tódolos cometas con orixe na Nube de Oort poderían ser resultado da marea galáctica.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span>[</span>38<span>]</span></a></sup> Os modelos <a href="/wiki/Estat%C3%ADstica" title="Estatística">estatísticos</a> das órbitas observadas de cometas de período longo indican que a marea galáctica sería a principal causante de perturbacións das súas órbitas cara ó interior do Sistema Solar.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span>[</span>39<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Perturbacións_estelares_e_hipóteses_de_compañeiros_estelares"><span id="Perturbaci.C3.B3ns_estelares_e_hip.C3.B3teses_de_compa.C3.B1eiros_estelares"></span>Perturbacións estelares e hipóteses de compañeiros estelares</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=6" title="Editar a sección: «Perturbacións estelares e hipóteses de compañeiros estelares»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=6" title="Editar o código fonte da sección: Perturbacións estelares e hipóteses de compañeiros estelares"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Á marxe da marea galáctica, crese que a principal causa de que os cometas cheguen ó interior do Sistema Solar é a interacción entre a Nube de Oort e os <a href="/wiki/Campo_gravitatorio" title="Campo gravitatorio">campos gravitacionais</a> de estrelas próximas<sup id="cite_ref-Morbidelli2006_2-15" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup> ou de <a href="/wiki/Nube_molecular" title="Nube molecular">nubes moleculares</a> xigantes.<sup id="cite_ref-julio_36-1" class="reference"><a href="#cite_note-julio-36"><span>[</span>35<span>]</span></a></sup> A órbita do Sol a través do plano da <a href="/wiki/V%C3%ADa_L%C3%A1ctea" title="Vía Láctea">Vía Láctea</a> en ocasións provoca que se achegue a unha distancia relativamente próxima doutros sistemas estelares. Segundo as hipóteses máis aceptadas hai uns 70 000 anos a <a href="/w/index.php?title=Estrela_de_Scholz&action=edit&redlink=1" class="new" title="Estrela de Scholz (a páxina aínda non existe)">estrela de Scholz</a> podería ter atravesado a Nube exterior de Oort, aínda que a súa pequena masa e relativa alta velocidade tería limitado o seu efecto.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span>[</span>40<span>]</span></a></sup> Durante os seguintes 10 millóns de anos a estrela coñecida con maior posibilidade de perturbar a Nube de Oort é <a href="/w/index.php?title=Gliese_710&action=edit&redlink=1" class="new" title="Gliese 710 (a páxina aínda non existe)">Gliese 710</a>.<sup id="cite_ref-algol_42-0" class="reference"><a href="#cite_note-algol-42"><span>[</span>41<span>]</span></a></sup> Este proceso podería espallar os obxectos da nube cara a fóra do plano eclíptico, o que potencialmente podería explicar a súa distribución esférica.<sup id="cite_ref-algol_42-1" class="reference"><a href="#cite_note-algol-42"><span>[</span>41<span>]</span></a></sup><sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span>[</span>42<span>]</span></a></sup> </p><p>En 1984 o físico <a href="/w/index.php?title=Richard_A._Muller&action=edit&redlink=1" class="new" title="Richard A. Muller (a páxina aínda non existe)">Richard A. Muller</a> postulou que o Sol ten un compañeiro non detectado ata o de agora, ben unha <a href="/wiki/Anana_marr%C3%B3n" title="Anana marrón">anana marrón</a> ou unha <a href="/wiki/Anana_vermella" title="Anana vermella">anana vermella</a>, nunha órbita elíptica dentro da Nube de Oort. Este hipotético obxecto, coñecido como <a href="/w/index.php?title=N%C3%A9mesis_(estrela_hipot%C3%A9tica)&action=edit&redlink=1" class="new" title="Némesis (estrela hipotética) (a páxina aínda non existe)">Némesis</a>, atravesaría unha porción da Nube de Oort aproximadamente cada 26 millóns de anos, bombardeando de cometas o Sistema Solar interior. Porén, non se atoparon evidencias da existencia de Némesis, e hai numerosas liñas de evidencias que puxeron en dúbida a súa existencia.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span>[</span>43<span>]</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span>[</span>44<span>]</span></a></sup><sup id="cite_ref-Tyche2011-060_46-0" class="reference"><a href="#cite_note-Tyche2011-060-46"><span>[</span>45<span>]</span></a></sup> </p><p>Unha hipótese semellante avanzouna o astrónomo John J. Matese da <a href="/w/index.php?title=Universidade_de_Luisiana_en_Lafayette&action=edit&redlink=1" class="new" title="Universidade de Luisiana en Lafayette (a páxina aínda non existe)">Universidade de Luisiana en Lafayette</a> no ano 2002. Segundo Matese, habería máis cometas chegando ó interior do Sistema Solar procedentes dunha rexión particular da postulada Nube de Oort do que pode explicar a marea galáctica e as perturbacións estelares, e a causa máis probable disto sería a existencia dun obxecto de masa semellante á de <a href="/wiki/X%C3%BApiter" title="Xúpiter">Xúpiter</a> presente nunha órbita distante.<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span>[</span>46<span>]</span></a></sup> Este hipotético <a href="/wiki/Xigante_gasoso" title="Xigante gasoso">xigante gasoso</a> recibiu o nome de <a href="/w/index.php?title=Tyche&action=edit&redlink=1" class="new" title="Tyche (a páxina aínda non existe)">Tyche</a>. A <a href="/w/index.php?title=Misi%C3%B3n_WISE&action=edit&redlink=1" class="new" title="Misión WISE (a páxina aínda non existe)">misión WISE</a>, un proxecto de <a href="/w/index.php?title=Exploraci%C3%B3n_astron%C3%B3mica&action=edit&redlink=1" class="new" title="Exploración astronómica (a páxina aínda non existe)">exploración astronómica</a> usando medidas de <a href="/wiki/Paralaxe" title="Paralaxe">paralaxe</a> para clarificar as distancias estelares locais, tería a capacidade de probar ou refutar a hipótese de Tyche.<sup id="cite_ref-Tyche2011-060_46-1" class="reference"><a href="#cite_note-Tyche2011-060-46"><span>[</span>45<span>]</span></a></sup> En 2014 a NASA anunciou que esta misión descartou a existencia de calquera tipo de obxecto que coincidise con esta definición.<sup id="cite_ref-NASA-20140307_48-0" class="reference"><a href="#cite_note-NASA-20140307-48"><span>[</span>47<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Exploración"><span id="Exploraci.C3.B3n"></span>Exploración</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=7" title="Editar a sección: «Exploración»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=7" title="Editar o código fonte da sección: Exploración"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Ficheiro:Thousandau1_space_probe.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Thousandau1_space_probe.jpg/220px-Thousandau1_space_probe.jpg" decoding="async" width="220" height="171" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Thousandau1_space_probe.jpg/330px-Thousandau1_space_probe.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Thousandau1_space_probe.jpg/440px-Thousandau1_space_probe.jpg 2x" data-file-width="499" data-file-height="388" /></a><figcaption>Impresión artística da sonda <a href="/w/index.php?title=TAU_(sonda)&action=edit&redlink=1" class="new" title="TAU (sonda) (a páxina aínda non existe)"><i>TAU</i> </a></figcaption></figure> <p>As sondas espaciais lanzadas dende a Terra non alcanzaron a zona da Nube de Oort. A sonda <i><a href="/wiki/Voyager_1" title="Voyager 1">Voyager 1</a></i>, a máis rápida<sup id="cite_ref-New_Horizons2006_49-0" class="reference"><a href="#cite_note-New_Horizons2006-49"><span>[</span>48<span>]</span></a></sup> e que chegou máis lonxe<sup id="cite_ref-g.2013sep13_50-0" class="reference"><a href="#cite_note-g.2013sep13-50"><span>[</span>49<span>]</span></a></sup><sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span>[</span>50<span>]</span></a></sup> das sondas espaciais interplanetarias viaxando cara a fóra do Sistema Solar, alcanzará á Nube de Oort aproximadamente no ano 2300,<sup id="cite_ref-jpl.PIA17046_5-1" class="reference"><a href="#cite_note-jpl.PIA17046-5"><span>[</span>4<span>]</span></a></sup><sup id="cite_ref-ut.104717_52-0" class="reference"><a href="#cite_note-ut.104717-52"><span>[</span>51<span>]</span></a></sup> e levaríalle uns 30 000 anos atravesala.<sup id="cite_ref-Ghose2013_53-0" class="reference"><a href="#cite_note-Ghose2013-53"><span>[</span>52<span>]</span></a></sup><sup id="cite_ref-How_We_Know_54-0" class="reference"><a href="#cite_note-How_We_Know-54"><span>[</span>53<span>]</span></a></sup> Porén, cara ó ano 2025 os <a href="/wiki/Xerador_termoel%C3%A9ctrico_de_radiois%C3%B3topos" title="Xerador termoeléctrico de radioisótopos">xeradores termoeléctricos de radioisótopos</a> do <i>Voyager 1</i> xa non poderán fornecer de enerxía suficiente á sonda para operar os seus instrumentos científicos, o que impedirá calquera tipo de exploración por medio desta sonda. O resto de sondas que se atopan actualmente saíndo do Sistema Solar xa non están funcionais ou estímase que non o estean cando cheguen á Nube de Oort. Nos <a href="/wiki/D%C3%A9cada_de_1980" title="Década de 1980">anos 1980</a> deseñouse un concepto para unha sonda que chegaría ás 1 000 UA en 50 anos, denominada <i><a href="/w/index.php?title=TAU_(sonda)&action=edit&redlink=1" class="new" title="TAU (sonda) (a páxina aínda non existe)">TAU</a></i>, e entre as súas misións estaría a de investigar a existencia da Nube de Oort.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span>[</span>54<span>]</span></a></sup> </p><p>En 2014 propúxose unha misión de observación para detectar os obxectos na Nube de Oort e no cinto de Kuiper, denominada <a href="/w/index.php?title=Whipple_(sonda)&action=edit&redlink=1" class="new" title="Whipple (sonda) (a páxina aínda non existe)">"Misión Whipple"</a>.<sup id="cite_ref-whipple.cfa.harvard.edu_56-0" class="reference"><a href="#cite_note-whipple.cfa.harvard.edu-56"><span>[</span>55<span>]</span></a></sup> Esta observaría as estrelas distantes cun <a href="/w/index.php?title=Fot%C3%B3metro&action=edit&redlink=1" class="new" title="Fotómetro (a páxina aínda non existe)">fotómetro</a>, procurando tránsitos de ata 10 000 UA de distancia.<sup id="cite_ref-whipple.cfa.harvard.edu_56-1" class="reference"><a href="#cite_note-whipple.cfa.harvard.edu-56"><span>[</span>55<span>]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Notas">Notas</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nube_de_Oort&veaction=edit&section=8" title="Editar a sección: «Notas»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Nube_de_Oort&action=edit&section=8" title="Editar o código fonte da sección: Notas"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: lower-alpha;"> <ol class="references"> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text">O límite exterior da Nube de Oort é difícil de definir xa que varía cos <a href="/wiki/Milenio" title="Milenio">milenios</a> e co paso de estrelas a certa distancia do <a href="/wiki/Sol" title="Sol">Sol</a>, e polo tanto pode variar. As estimacións da súa distancia varían de entre as 50 000 ata as 200 000 UA.<sup id="cite_ref-Morbidelli2006_2-0" class="reference"><a href="#cite_note-Morbidelli2006-2"><span>[</span>2<span>]</span></a></sup></span> </li> </ol></div> <dl><dt>Referencias</dt></dl> <p><span style="font-style: italic; font-size: 95%; padding-left: 1.6em; margin-bottom: 0.5em;">Todas as referencias en inglés agás cando se indique o contrario.</span> </p> <div class="reflist columns references-column-width" style="-moz-column-width: 30em; -webkit-column-width: 30em; column-width: 30em; list-style-type: decimal;"> <ol class="references"> <li id="cite_note-Whipple-1"><span class="mw-cite-backlink"><a href="#cite_ref-Whipple_1-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Whipple, F. L.; Turner, G.; McDonnell, J. A. M.; Wallis, M. K. (1987-09-30). <a rel="nofollow" class="external text" href="http://rsta.royalsocietypublishing.org/content/323/1572/339.short">"A Review of Cometary Sciences"</a>. <i>Philosophical Transactions of the Royal Society A</i> <b>323</b> (1572): 339–347 [341]. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1987RSPTA.323..339W">1987RSPTA.323..339W</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1098%2Frsta.1987.0090">10.1098/rsta.1987.0090</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=A+Review+of+Cometary+Sciences&rft.au=McDonnell%2C+J.+A.+M.&rft.au=Turner%2C+G.&rft.au=Wallis%2C+M.+K.&rft.aufirst=F.+L.&rft.aulast=Whipple&rft.date=1987-09-30&rft.genre=article&rft.issue=1572&rft.jtitle=Philosophical+Transactions+of+the+Royal+Society+A&rft.pages=339-347+341&rft.volume=323&rft_id=http%3A%2F%2Frsta.royalsocietypublishing.org%2Fcontent%2F323%2F1572%2F339.short&rft_id=info%3Abibcode%2F1987RSPTA.323..339W&rft_id=info%3Adoi%2F10.1098%2Frsta.1987.0090&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Morbidelli2006-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Morbidelli2006_2-0">2,00</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-1">2,01</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-2">2,02</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-3">2,03</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-4">2,04</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-5">2,05</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-6">2,06</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-7">2,07</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-8">2,08</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-9">2,09</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-10">2,10</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-11">2,11</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-12">2,12</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-13">2,13</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-14">2,14</a></sup> <sup><a href="#cite_ref-Morbidelli2006_2-15">2,15</a></sup></span> <span class="reference-text"><cite class="citation arxiv">Alessandro Morbidelli (2006). "Origin and dynamical evolution of comets and their reservoirs of water ammonia and methane". <a href="/wiki/ArXiv" title="ArXiv">arXiv</a>:<a rel="nofollow" class="external text" href="//arxiv.org/abs/astro-ph/0512256">astro-ph/0512256</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Origin+and+dynamical+evolution+of+comets+and+their+reservoirs+of+water+ammonia+and+methane&rft.au=Alessandro+Morbidelli&rft.date=2006&rft.genre=preprint&rft.jtitle=arXiv&rft_id=info%3Aarxiv%2Fastro-ph%2F0512256&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span> </span> </li> <li id="cite_note-Öpik-1932-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Öpik-1932_4-0">3,0</a></sup> <sup><a href="#cite_ref-Öpik-1932_4-1">3,1</a></sup></span> <span class="reference-text"><cite class="citation journal">Ernst Julius Öpik (1932). "Note on Stellar Perturbations of Nearby Parabolic Orbits". <i>Proceedings of the American Academy of Arts and Sciences</i> <b>67</b> (6): 169–182. <a href="/wiki/JSTOR" title="JSTOR">JSTOR</a> <a rel="nofollow" class="external text" href="//www.jstor.org/stable/20022899">20022899</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.2307%2F20022899">10.2307/20022899</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Note+on+Stellar+Perturbations+of+Nearby+Parabolic+Orbits&rft.au=Ernst+Julius+%C3%96pik&rft.date=1932&rft.genre=article&rft.issue=6&rft.jtitle=Proceedings+of+the+American+Academy+of+Arts+and+Sciences&rft.pages=169-182&rft.volume=67&rft_id=%2F%2Fwww.jstor.org%2Fstable%2F20022899&rft_id=info%3Adoi%2F10.2307%2F20022899&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-jpl.PIA17046-5"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-jpl.PIA17046_5-0">4,0</a></sup> <sup><a href="#cite_ref-jpl.PIA17046_5-1">4,1</a></sup></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://photojournal.jpl.nasa.gov/catalog/PIA17046">"Catalog Page for PIA17046"</a>. <i>Photo Journal</i>. NASA<span class="reference-accessdate">. Consultado o 27 de abril de 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Catalog+Page+for+PIA17046&rft.genre=unknown&rft.jtitle=Photo+Journal&rft_id=http%3A%2F%2Fphotojournal.jpl.nasa.gov%2Fcatalog%2FPIA17046&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-NASA_SSE_oort-6"><span class="mw-cite-backlink"><a href="#cite_ref-NASA_SSE_oort_6-0">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://www.webcitation.org/6H9dgALGe?url=http://solarsystem.nasa.gov/planets/profile.cfm?Object=KBOs&Display=OverviewLong">"Kuiper Belt & Oort Cloud"</a>. <i>NASA Solar System Exploration web site</i>. <a href="/wiki/NASA" title="NASA">NASA</a>. Arquivado dende <a rel="nofollow" class="external text" href="https://solarsystem.nasa.gov/planets/profile.cfm?Object=KBOs&Display=OverviewLong">o orixinal</a> o 05 de xuño de 2013<span class="reference-accessdate">. Consultado o 8 de agosto de 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Kuiper+Belt+%26+Oort+Cloud&rft.genre=unknown&rft.jtitle=NASA+Solar+System+Exploration+web+site&rft_id=http%3A%2F%2Fsolarsystem.nasa.gov%2Fplanets%2Fprofile.cfm%3FObject%3DKBOs%26Display%3DOverviewLong&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-emel2007-7"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-emel2007_7-0">6,0</a></sup> <sup><a href="#cite_ref-emel2007_7-1">6,1</a></sup> <sup><a href="#cite_ref-emel2007_7-2">6,2</a></sup> <sup><a href="#cite_ref-emel2007_7-3">6,3</a></sup></span> <span class="reference-text"><cite class="citation journal">V. V. Emelyanenko; D. J. Asher; M. E. Bailey (2007). "The fundamental role of the Oort Cloud in determining the flux of comets through the planetary system". <i>Monthly Notices of the Royal Astronomical Society</i> <b>381</b> (2): 779–789. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2007MNRAS.381..779E">2007MNRAS.381..779E</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1111%2Fj.1365-2966.2007.12269.x">10.1111/j.1365-2966.2007.12269.x</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+fundamental+role+of+the+Oort+Cloud+in+determining+the+flux+of+comets+through+the+planetary+system&rft.au=D.+J.+Asher&rft.au=M.+E.+Bailey&rft.au=V.+V.+Emelyanenko&rft.date=2007&rft.genre=article&rft.issue=2&rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.pages=779-789&rft.volume=381&rft_id=info%3Abibcode%2F2007MNRAS.381..779E&rft_id=info%3Adoi%2F10.1111%2Fj.1365-2966.2007.12269.x&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-book-8"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-book_8-0">7,0</a></sup> <sup><a href="#cite_ref-book_8-1">7,1</a></sup> <sup><a href="#cite_ref-book_8-2">7,2</a></sup> <sup><a href="#cite_ref-book_8-3">7,3</a></sup> <sup><a href="#cite_ref-book_8-4">7,4</a></sup> <sup><a href="#cite_ref-book_8-5">7,5</a></sup> <sup><a href="#cite_ref-book_8-6">7,6</a></sup></span> <span class="reference-text"><cite class="citation book">Harold F. Levison; Luke Donnes (2007). "Comet Populations and Cometary Dynamics". En Lucy Ann Adams McFadden; Lucy-Ann Adams; Paul Robert Weissman; Torrence V. Johnson. <a rel="nofollow" class="external text" href="https://archive.org/details/encyclopediasola00mcfa_702"><i>Encyclopedia of the Solar System</i></a> (2nd ed.). Amsterdam; Boston: Academic Press. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/encyclopediasola00mcfa_702/page/n592">575</a>–588. <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Especial:Fontes_bibliogr%C3%A1ficas/978-0-12-088589-3" title="Especial:Fontes bibliográficas/978-0-12-088589-3">978-0-12-088589-3</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Comet+Populations+and+Cometary+Dynamics&rft.au=Harold+F.+Levison&rft.au=Luke+Donnes&rft.btitle=Encyclopedia+of+the+Solar+System&rft.date=2007&rft.edition=2nd&rft.genre=bookitem&rft.isbn=978-0-12-088589-3&rft.pages=575-588&rft.place=Amsterdam%3B+Boston&rft.pub=Academic+Press&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fencyclopediasola00mcfa_702&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-ley1967204-9"><span class="mw-cite-backlink"><a href="#cite_ref-ley1967204_9-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Ley, Willy (1967). <a rel="nofollow" class="external text" href="https://archive.org/stream/Galaxy_v25n04_1967-04#page/n55/mode/2up">"The Orbits of the Comets"</a>. For Your Information. <i>Galaxy Science Fiction</i>: 55–63.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Orbits+of+the+Comets&rft.aufirst=Willy&rft.aulast=Ley&rft.date=1967&rft.genre=article&rft.jtitle=Galaxy+Science+Fiction&rft.pages=55-63&rft_id=https%3A%2F%2Farchive.org%2Fstream%2FGalaxy_v25n04_1967-04%23page%2Fn55%2Fmode%2F2up&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Oort-10"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Oort_10-0">9,0</a></sup> <sup><a href="#cite_ref-Oort_10-1">9,1</a></sup></span> <span class="reference-text"><cite class="citation journal">Jan Oort (1950). "The structure of the cloud of comets surrounding the Solar System and a hypothesis concerning its origin". <i>Bulletin of the Astronomical Institutes of the Netherlands</i> <b>11</b>: 91–110. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1950BAN....11...91O">1950BAN....11...91O</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+structure+of+the+cloud+of+comets+surrounding+the+Solar+System+and+a+hypothesis+concerning+its+origin&rft.au=Jan+Oort&rft.date=1950&rft.genre=article&rft.jtitle=Bulletin+of+the+Astronomical+Institutes+of+the+Netherlands&rft.pages=91-110&rft.volume=11&rft_id=info%3Abibcode%2F1950BAN....11...91O&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-dave-11"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-dave_11-0">10,0</a></sup> <sup><a href="#cite_ref-dave_11-1">10,1</a></sup></span> <span class="reference-text"><cite class="citation journal">David C. Jewitt (2001). "From Kuiper Belt to Cometary Nucleus: The Missing Ultrared Matter". <i>Astronomical Journal</i> <b>123</b> (2): 1039–1049. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2002AJ....123.1039J">2002AJ....123.1039J</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F338692">10.1086/338692</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=From+Kuiper+Belt+to+Cometary+Nucleus%3A+The+Missing+Ultrared+Matter&rft.au=David+C.+Jewitt&rft.date=2001&rft.genre=article&rft.issue=2&rft.jtitle=Astronomical+Journal&rft.pages=1039-1049&rft.volume=123&rft_id=info%3Abibcode%2F2002AJ....123.1039J&rft_id=info%3Adoi%2F10.1086%2F338692&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-hills1981-12"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-hills1981_12-0">11,0</a></sup> <sup><a href="#cite_ref-hills1981_12-1">11,1</a></sup></span> <span class="reference-text"><cite class="citation journal">Jack G. Hills (1981). "Comet showers and the steady-state infall of comets from the Oort Cloud". <i>Astronomical Journal]</i> <b>86</b>: 1730–1740. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1981AJ.....86.1730H">1981AJ.....86.1730H</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F113058">10.1086/113058</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Comet+showers+and+the+steady-state+infall+of+comets+from+the+Oort+Cloud&rft.au=Jack+G.+Hills&rft.date=1981&rft.genre=article&rft.jtitle=Astronomical+Journal%5D&rft.pages=1730-1740&rft.volume=86&rft_id=info%3Abibcode%2F1981AJ.....86.1730H&rft_id=info%3Adoi%2F10.1086%2F113058&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-levison2001-13"><span class="mw-cite-backlink"><a href="#cite_ref-levison2001_13-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Harold F. Levison; Luke Dones; Martin J. Duncan (2001). <a rel="nofollow" class="external text" href="https://archive.org/details/sim_astronomical-journal_2001-04_121_4/page/2253">"The Origin of Halley-Type Comets: Probing the Inner Oort Cloud"</a>. <i>Astronomical Journal</i> <b>121</b> (4): 2253–2267. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2001AJ....121.2253L">2001AJ....121.2253L</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F319943">10.1086/319943</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Origin+of+Halley-Type+Comets%3A+Probing+the+Inner+Oort+Cloud&rft.au=Harold+F.+Levison&rft.au=Luke+Dones&rft.au=Martin+J.+Duncan&rft.date=2001&rft.genre=article&rft.issue=4&rft.jtitle=Astronomical+Journal&rft.pages=2253-2267&rft.volume=121&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsim_astronomical-journal_2001-04_121_4%2Fpage%2F2253&rft_id=info%3Abibcode%2F2001AJ....121.2253L&rft_id=info%3Adoi%2F10.1086%2F319943&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Donahue1991-14"><span class="mw-cite-backlink"><a href="#cite_ref-Donahue1991_14-0">↑</a></span> <span class="reference-text"><cite class="citation book">Thomas M. Donahue, ed. (1991). <a rel="nofollow" class="external text" href="http://books.nap.edu/openbook.php?record_id=1790&page=R1"><i>Planetary Sciences: American and Soviet Research, Proceedings from the U.S.–U.S.S.R. Workshop on Planetary Sciences</i></a>. Kathleen Kearney Trivers, and David M. Abramson. National Academy Press. p. 251. <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Especial:Fontes_bibliogr%C3%A1ficas/978-0-309-04333-5" title="Especial:Fontes bibliográficas/978-0-309-04333-5">978-0-309-04333-5</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.btitle=Planetary+Sciences%3A+American+and+Soviet+Research%2C+Proceedings+from+the+U.S.%93U.S.S.R.+Workshop+on+Planetary+Sciences&rft.date=1991&rft.genre=book&rft.isbn=978-0-309-04333-5&rft.pages=251&rft.pub=National+Academy+Press&rft_id=http%3A%2F%2Fbooks.nap.edu%2Fopenbook.php%3Frecord_id%3D1790%26page%3DR1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Julio1997-15"><span class="mw-cite-backlink"><a href="#cite_ref-Julio1997_15-0">↑</a></span> <span class="reference-text"><cite class="citation journal">Julio A. Fernéndez (1997). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120724192955/http://www.gps.caltech.edu/classes/ge133/reading/oort.pdf">"The Formation of the Oort Cloud and the Primitive Galactic Environment"</a> <span style="font-size:85%;">(PDF)</span>. <i>Icarus</i> <b>219</b>: 106–119. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1997Icar..129..106F">1997Icar..129..106F</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1006%2Ficar.1997.5754">10.1006/icar.1997.5754</a>. Arquivado dende <a rel="nofollow" class="external text" href="http://www.gps.caltech.edu/classes/ge133/reading/oort.pdf">o orixinal</a> <span style="font-size:85%;">(PDF)</span> o 24 de xullo de 2012<span class="reference-accessdate">. Consultado o 20 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Formation+of+the+Oort+Cloud+and+the+Primitive+Galactic+Environment&rft.au=Julio+A.+Fern%C3%A9ndez&rft.date=1997&rft.genre=article&rft.jtitle=Icarus&rft.pages=106-119&rft.volume=219&rft_id=http%3A%2F%2Fwww.gps.caltech.edu%2Fclasses%2Fge133%2Freading%2Foort.pdf&rft_id=info%3Abibcode%2F1997Icar..129..106F&rft_id=info%3Adoi%2F10.1006%2Ficar.1997.5754&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><a href="#cite_ref-16">↑</a></span> <span class="reference-text"><cite class="citation web">Paul R. Weissman (1998). <a rel="nofollow" class="external text" href="https://www.webcitation.org/68uaeB5os?url=http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview">"The Oort Cloud"</a>. <i>Scientific American</i>. Arquivado dende <a rel="nofollow" class="external text" href="http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ISSUEID_CHAR=8DB2FB44-6B4B-47AF-B46B-791A911764D&ARTICLEID_CHAR=B294C211-98B8-4374-92AB-158C4866AB1">o orixinal</a> o 04 de xullo de 2012<span class="reference-accessdate">. Consultado o 26 de maio de 2007</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Oort+Cloud&rft.au=Paul+R.+Weissman&rft.date=1998&rft.genre=unknown&rft.jtitle=Scientific+American&rft_id=http%3A%2F%2Fwww.sciamdigital.com%2Findex.cfm%3Ffa%3DProducts.ViewIssuePreview%26ISSUEID_CHAR%3D8DB2FB44-6B4B-47AF-B46B-791A911764D%26ARTICLEID_CHAR%3DB294C211-98B8-4374-92AB-158C4866AB1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><a href="#cite_ref-17">↑</a></span> <span class="reference-text"><cite class="citation journal">Paul R. Weissman (1983). <a rel="nofollow" class="external text" href="https://archive.org/details/sim_astronomy-and-astrophysics_1983-02_118_1/page/90">"The mass of the Oort Cloud"</a>. <i>Astronomy and Astrophysics</i> <b>118</b> (1): 90–94. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1983A&A...118...90W">1983A&A...118...90W</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+mass+of+the+Oort+Cloud&rft.au=Paul+R.+Weissman&rft.date=1983&rft.genre=article&rft.issue=1&rft.jtitle=Astronomy+and+Astrophysics&rft.pages=90-94&rft.volume=118&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsim_astronomy-and-astrophysics_1983-02_118_1%2Fpage%2F90&rft_id=info%3Abibcode%2F1983A%26A...118...90W&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><a href="#cite_ref-18">↑</a></span> <span class="reference-text"><cite class="citation web">Sebastian Buhai. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060930193158/http://www.tinbergen.nl/~buhai/pictures/UCU/Physics_AppliedMathematics/Astrophysics/long_period_comets.pdf">"On the Origin of the Long Period Comets: Competing theories"</a> <span style="font-size:85%;">(PDF)</span>. Utrecht University College. Arquivado dende <a rel="nofollow" class="external text" href="http://www.tinbergen.nl/~buhai/pictures/UCU/Physics_AppliedMathematics/Astrophysics/long_period_comets.pdf">o orixinal</a> <span style="font-size:85%;">(PDF)</span> o 30 de setembro de 2006<span class="reference-accessdate">. Consultado o 20 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.au=Sebastian+Buhai&rft.btitle=On+the+Origin+of+the+Long+Period+Comets%3A+Competing+theories&rft.genre=unknown&rft.pub=Utrecht+University+College&rft_id=http%3A%2F%2Fwww.tinbergen.nl%2F~buhai%2Fpictures%2FUCU%2FPhysics_AppliedMathematics%2FAstrophysics%2Flong_period_comets.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><a href="#cite_ref-19">↑</a></span> <span class="reference-text"><cite class="citation journal">E. L. Gibb; M. J. Mumma; N. Dello Russo; M. A. DiSanti & K. Magee-Sauer (2003). "Methane in Oort Cloud comets". <i>Icarus</i> <b>165</b> (2): 391–406. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2003Icar..165..391G">2003Icar..165..391G</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2FS0019-1035%2803%2900201-X">10.1016/S0019-1035(03)00201-X</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Methane+in+Oort+Cloud+comets&rft.au=E.+L.+Gibb&rft.au=K.+Magee-Sauer&rft.au=M.+A.+DiSanti&rft.au=M.+J.+Mumma&rft.au=N.+Dello+Russo&rft.date=2003&rft.genre=article&rft.issue=2&rft.jtitle=Icarus&rft.pages=391-406&rft.volume=165&rft_id=info%3Abibcode%2F2003Icar..165..391G&rft_id=info%3Adoi%2F10.1016%2FS0019-1035%2803%2900201-X&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><a href="#cite_ref-20">↑</a></span> <span class="reference-text"><cite class="citation journal">Rabinowitz, D. L. (1996). "1996 PW". <i>IAU Circular</i> <b>6466</b>: 2. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1996IAUC.6466....2R">1996IAUC.6466....2R</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=1996+PW&rft.aufirst=D.+L.&rft.aulast=Rabinowitz&rft.date=1996&rft.genre=article&rft.jtitle=IAU+Circular&rft.pages=2&rft.volume=6466&rft_id=info%3Abibcode%2F1996IAUC.6466....2R&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><a href="#cite_ref-21">↑</a></span> <span class="reference-text"><cite class="citation journal">Davies, John K.; McBride, Neil; Green, Simon F.; Mottola, Stefano; et al. (1998). "The Lightcurve and Colors of Unusual Minor Planet 1996 PW". <i>Icarus</i> <b>132</b> (2): 418–430. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1998Icar..132..418D">1998Icar..132..418D</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1006%2Ficar.1998.5888">10.1006/icar.1998.5888</a>. <span style="font-size:0.95em; font-size:90%; color:#555">(require subscrición (<span title="As fontes non teñen por que estar dispoñibles en liña. As fontes en liña non sempre son de acceso libre. O sitio referenciado pode requirir unha subscrición de pago." style="border-bottom:1px dotted;cursor:help">?</span>))</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Lightcurve+and+Colors+of+Unusual+Minor+Planet+1996+PW&rft.au=Basran%2C+Devinder&rft.au=Carsenty%2C+Uri&rft.au=Foster%2C+Michael+J.&rft.au=Green%2C+Simon+F.&rft.au=Hudson%2C+Kathryn+A.&rft.au=McBride%2C+Neil&rft.au=Mottola%2C+Stefano&rft.aufirst=John+K.&rft.aulast=Davies&rft.date=1998&rft.genre=article&rft.issue=2&rft.jtitle=Icarus&rft.pages=418-430&rft.volume=132&rft_id=info%3Abibcode%2F1998Icar..132..418D&rft_id=info%3Adoi%2F10.1006%2Ficar.1998.5888&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><a href="#cite_ref-22">↑</a></span> <span class="reference-text"><cite class="citation journal">Paul R. Weissman; Harold F. Levison (1997). "Origin and Evolution of the Unusual Object 1996 PW: Asteroids from the Oort Cloud?". <i>Astrophysical Journal</i> <b>488</b> (2): L133–L136. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1997ApJ...488L.133W">1997ApJ...488L.133W</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F310940">10.1086/310940</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Origin+and+Evolution+of+the+Unusual+Object+1996+PW%3A+Asteroids+from+the+Oort+Cloud%3F&rft.au=Harold+F.+Levison&rft.au=Paul+R.+Weissman&rft.date=1997&rft.genre=article&rft.issue=2&rft.jtitle=Astrophysical+Journal&rft.pages=L133-L136&rft.volume=488&rft_id=info%3Abibcode%2F1997ApJ...488L.133W&rft_id=info%3Adoi%2F10.1086%2F310940&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><a href="#cite_ref-23">↑</a></span> <span class="reference-text"><cite class="citation journal">D. Hutsemekers; J. Manfroid; E. Jehin; C. Arpigny; A. Cochran; R. Schulz; J.A. Stüwe & J.M. Zucconi (2005). "Isotopic abundances of carbon and nitrogen in Jupiter-family and Oort Cloud comets". <i>Astronomy and Astrophysics</i> <b>440</b> (2): L21–L24. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2005A&A...440L..21H">2005A&A...440L..21H</a>. <a href="/wiki/ArXiv" title="ArXiv">arXiv</a>:<a rel="nofollow" class="external text" href="//arxiv.org/abs/astro-ph/0508033">astro-ph/0508033</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1051%2F0004-6361%3A200500160">10.1051/0004-6361:200500160</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Isotopic+abundances+of+carbon+and+nitrogen+in+Jupiter-family+and+Oort+Cloud+comets&rft.au=A.+Cochran&rft.au=C.+Arpigny&rft.au=D.+Hutsemekers&rft.au=E.+Jehin&rft.au=J.+Manfroid&rft.au=J.A.+St%C3%BCwe&rft.au=J.M.+Zucconi&rft.au=R.+Schulz&rft.date=2005&rft.genre=article&rft.issue=2&rft.jtitle=Astronomy+and+Astrophysics&rft.pages=L21-L24&rft.volume=440&rft_id=info%3Aarxiv%2Fastro-ph%2F0508033&rft_id=info%3Abibcode%2F2005A%26A...440L..21H&rft_id=info%3Adoi%2F10.1051%2F0004-6361%3A200500160&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><a href="#cite_ref-24">↑</a></span> <span class="reference-text"><cite class="citation journal">Takafumi Ootsubo; Jun-ichi Watanabe; Hideyo Kawakita; Mitsuhiko Honda & Reiko Furusho (2007). "Grain properties of Oort Cloud comets: Modeling the mineralogical composition of cometary dust from mid-infrared emission features". <i>Highlights in Planetary Science, 2nd General Assembly of Asia Oceania Geophysical Society</i> <b>55</b> (9): 1044–1049. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2007P&SS...55.1044O">2007P&SS...55.1044O</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2Fj.pss.2006.11.012">10.1016/j.pss.2006.11.012</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Grain+properties+of+Oort+Cloud+comets%3A+Modeling+the+mineralogical+composition+of+cometary+dust+from+mid-infrared+emission+features&rft.au=Hideyo+Kawakita&rft.au=Jun-ichi+Watanabe&rft.au=Mitsuhiko+Honda&rft.au=Reiko+Furusho&rft.au=Takafumi+Ootsubo&rft.date=2007&rft.genre=article&rft.issue=9&rft.jtitle=Highlights+in+Planetary+Science%2C+2nd+General+Assembly+of+Asia+Oceania+Geophysical+Society&rft.pages=1044-1049&rft.volume=55&rft_id=info%3Abibcode%2F2007P%26SS...55.1044O&rft_id=info%3Adoi%2F10.1016%2Fj.pss.2006.11.012&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><a href="#cite_ref-25">↑</a></span> <span class="reference-text"><cite class="citation journal">Michael J. Mumma; Michael A. DiSanti; Karen Magee-Sauer; et al. (2005). <a rel="nofollow" class="external text" href="https://authors.library.caltech.edu/52069/7/Mumma.SOM.pdf">"Parent Volatiles in Comet 9P/Tempel 1: Before and After Impact"</a> <span style="font-size:85%;">(PDF)</span>. <i>Science Express</i> <b>310</b> (5746): 270–274. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2005Sci...310..270M">2005Sci...310..270M</a>. <a href="/wiki/PubMed" title="PubMed">PMID</a> <a rel="nofollow" class="external text" href="//www.ncbi.nlm.nih.gov/pubmed/16166477">16166477</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1126%2Fscience.1119337">10.1126/science.1119337</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Parent+Volatiles+in+Comet+9P%2FTempel+1%3A+Before+and+After+Impact&rft.au=Karen+Magee-Sauer&rft.au=Michael+A.+DiSanti&rft.au=Michael+J.+Mumma&rft.date=2005&rft.genre=article&rft.issue=5746&rft.jtitle=Science+Express&rft.pages=270-274&rft.volume=310&rft_id=https%3A%2F%2Fauthors.library.caltech.edu%2F52069%2F7%2FMumma.SOM.pdf&rft_id=info%3Abibcode%2F2005Sci...310..270M&rft_id=info%3Adoi%2F10.1126%2Fscience.1119337&rft_id=info%3Apmid%2F16166477&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-nasax-26"><span class="mw-cite-backlink"><a href="#cite_ref-nasax_26-0">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20210125015211/http://science.nasa.gov/science-news/science-at-nasa/2010/23nov_aliencomets">"The Sun Steals Comets from Other Stars"</a>. NASA. 2010. Arquivado dende <a rel="nofollow" class="external text" href="https://science.nasa.gov/science-news/science-at-nasa/2010/23nov_aliencomets/">o orixinal</a> o 25 de xaneiro de 2021<span class="reference-accessdate">. Consultado o 20 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.btitle=The+Sun+Steals+Comets+from+Other+Stars&rft.date=2010&rft.genre=unknown&rft.pub=NASA&rft_id=https%3A%2F%2Fscience.nasa.gov%2Fscience-news%2Fscience-at-nasa%2F2010%2F23nov_aliencomets%2F&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><a href="#cite_ref-27">↑</a></span> <span class="reference-text"><cite class="citation journal">Julio A. Fernández; Tabaré Gallardo & Adrián Brunini (2004). "The scattered disc population as a source of Oort Cloud comets: evaluation of its current and past role in populating the Oort Cloud". <i>Icarus</i> <b>172</b> (2): 372–381. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2004Icar..172..372F">2004Icar..172..372F</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2Fj.icarus.2004.07.023">10.1016/j.icarus.2004.07.023</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+scattered+disc+population+as+a+source+of+Oort+Cloud+comets%3A+evaluation+of+its+current+and+past+role+in+populating+the+Oort+Cloud&rft.au=Adri%C3%A1n+Brunini&rft.au=Julio+A.+Fern%C3%A1ndez&rft.au=Tabar%C3%A9+Gallardo&rft.date=2004&rft.genre=article&rft.issue=2&rft.jtitle=Icarus&rft.pages=372-381&rft.volume=172&rft_id=info%3Abibcode%2F2004Icar..172..372F&rft_id=info%3Adoi%2F10.1016%2Fj.icarus.2004.07.023&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><a href="#cite_ref-28">↑</a></span> <span class="reference-text"><cite class="citation book">Davies, J. K.; Barrera, L. H. (2004). <a rel="nofollow" class="external text" href="https://books.google.com/?id=WuDdVbJf_d8C&pg=PA43&dq=+oort+cloud"><i>The First Decadal Review of the Edgeworth-Kuiper Belt.</i></a> Kluwer Academic Publishers. <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Especial:Fontes_bibliogr%C3%A1ficas/978-1-4020-1781-0" title="Especial:Fontes bibliográficas/978-1-4020-1781-0">978-1-4020-1781-0</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.au=Barrera%2C+L.+H.&rft.au=Davies%2C+J.+K.&rft.btitle=The+First+Decadal+Review+of+the+Edgeworth-Kuiper+Belt.&rft.date=2004&rft.genre=book&rft.isbn=978-1-4020-1781-0&rft.pub=Kluwer+Academic+Publishers&rft_id=https%3A%2F%2Fbooks.google.com%2F%3Fid%3DWuDdVbJf_d8C%26pg%3DPA43%26dq%3D%2Boort%2Bcloud&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><a href="#cite_ref-29">↑</a></span> <span class="reference-text"><cite class="citation journal">S. 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Brasser; M. J. Duncan; H.F. Levison (2006). "Embedded star clusters and the formation of the Oort Cloud". <i>Icarus</i> <b>184</b> (1): 59–82. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2006Icar..184...59B">2006Icar..184...59B</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2Fj.icarus.2006.04.010">10.1016/j.icarus.2006.04.010</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Embedded+star+clusters+and+the+formation+of+the+Oort+Cloud&rft.au=H.F.+Levison&rft.au=M.+J.+Duncan&rft.au=R.+Brasser&rft.date=2006&rft.genre=article&rft.issue=1&rft.jtitle=Icarus&rft.pages=59-82&rft.volume=184&rft_id=info%3Abibcode%2F2006Icar..184...59B&rft_id=info%3Adoi%2F10.1016%2Fj.icarus.2006.04.010&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-31"><span class="mw-cite-backlink"><a href="#cite_ref-31">↑</a></span> <span class="reference-text"><cite class="citation journal">Levison, Harold; et al. (10 de xuño de 2010). "Capture of the Sun's Oort Cloud from Stars in Its Birth Cluster". <i>Science</i> <b>329</b> (5988): 187–190. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2010Sci...329..187L">2010Sci...329..187L</a>. <a href="/wiki/PubMed" title="PubMed">PMID</a> <a rel="nofollow" class="external text" href="//www.ncbi.nlm.nih.gov/pubmed/20538912">20538912</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1126%2Fscience.1187535">10.1126/science.1187535</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Capture+of+the+Sun%27s+Oort+Cloud+from+Stars+in+Its+Birth+Cluster&rft.au=Levison%2C+Harold&rft.chron=10+de+xu%C3%B1o+de+2010&rft.genre=article&rft.issue=5988&rft.jtitle=Science&rft.pages=187-190&rft.volume=329&rft_id=info%3Abibcode%2F2010Sci...329..187L&rft_id=info%3Adoi%2F10.1126%2Fscience.1187535&rft_id=info%3Apmid%2F20538912&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-32"><span class="mw-cite-backlink"><a href="#cite_ref-32">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://www.webcitation.org/6H9vGLJk6?url=http://www.swri.org/9what/releases/2010/cometorigins.htm">"Many famous comets originally formed in other solar systems"</a>. <i>Southwest Research Institute® (SwRI®) News</i>. 10 de xuño de 2010. Arquivado dende <a rel="nofollow" class="external text" href="http://www.swri.org/9what/releases/2010/cometorigins.htm">o orixinal</a> o 05 de xuño de 2013<span class="reference-accessdate">. Consultado o 20 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Many+famous+comets+originally+formed+in+other+solar+systems&rft.chron=10+de+xu%C3%B1o+de+2010&rft.genre=unknown&rft.jtitle=Southwest+Research+Institute%AE+%28SwRI%AE%29+News&rft_id=http%3A%2F%2Fwww.swri.org%2F9what%2Freleases%2F2010%2Fcometorigins.htm&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-33"><span class="mw-cite-backlink"><a href="#cite_ref-33">↑</a></span> <span class="reference-text"><cite class="citation journal">Harold E. Levison & Luke Dones (2007). <a rel="nofollow" class="external text" href="https://archive.org/details/bwb_W8-BGD-739">"Comet Populations and Cometary dynamics"</a>. <i>Encyclopedia of the Solar System</i>: <a rel="nofollow" class="external text" href="https://archive.org/details/bwb_W8-BGD-739/page/575">575</a>–588. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2007ess..book..575L">2007ess..book..575L</a>. <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Especial:Fontes_bibliogr%C3%A1ficas/978-0-12-088589-3" title="Especial:Fontes bibliográficas/978-0-12-088589-3">978-0-12-088589-3</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2FB978-012088589-3%2F50035-9">10.1016/B978-012088589-3/50035-9</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Comet+Populations+and+Cometary+dynamics&rft.au=Harold+E.+Levison&rft.au=Luke+Dones&rft.date=2007&rft.genre=article&rft.isbn=978-0-12-088589-3&rft.jtitle=Encyclopedia+of+the+Solar+System&rft.pages=575-588&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fbwb_W8-BGD-739&rft_id=info%3Abibcode%2F2007ess..book..575L&rft_id=info%3Adoi%2F10.1016%2FB978-012088589-3%2F50035-9&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-34"><span class="mw-cite-backlink"><a href="#cite_ref-34">↑</a></span> <span class="reference-text"><cite class="citation journal">J Horner; NW Evans; ME Bailey; DJ Asher (2003). "The Populations of Comet-like Bodies in the Solar System". <i>Monthly Notices of the Royal Astronomical Society</i> <b>343</b> (4): 1057–1066. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2003MNRAS.343.1057H">2003MNRAS.343.1057H</a>. <a href="/wiki/ArXiv" title="ArXiv">arXiv</a>:<a rel="nofollow" class="external text" href="//arxiv.org/abs/astro-ph/0304319">astro-ph/0304319</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1046%2Fj.1365-8711.2003.06714.x">10.1046/j.1365-8711.2003.06714.x</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Populations+of+Comet-like+Bodies+in+the+Solar+System&rft.au=DJ+Asher&rft.au=J+Horner&rft.au=ME+Bailey&rft.au=NW+Evans&rft.date=2003&rft.genre=article&rft.issue=4&rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.pages=1057-1066&rft.volume=343&rft_id=info%3Aarxiv%2Fastro-ph%2F0304319&rft_id=info%3Abibcode%2F2003MNRAS.343.1057H&rft_id=info%3Adoi%2F10.1046%2Fj.1365-8711.2003.06714.x&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-35"><span class="mw-cite-backlink"><a href="#cite_ref-35">↑</a></span> <span class="reference-text"><cite class="citation book">Luke Dones; Paul R Weissman; Harold F Levison; Martin J Duncan (2004). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170824213414/http://www.uapress.arizona.edu/Books/bid1580.htm">"Oort Cloud Formation and Dynamics"</a>. En Michel C. Festou; H. Uwe Keller; Harold A. Weaver. <a rel="nofollow" class="external text" href="http://www.uapress.arizona.edu/books/bid1580.htm"><i>Comets II</i></a>. University of Arizona Press. pp. 153–173. Arquivado dende <a rel="nofollow" class="external text" href="http://www.lpi.usra.edu/books/CometsII/7031.pdf">o orixinal</a> <span style="font-size:85%;">(PDF)</span> o 24 de agosto de 2017<span class="reference-accessdate">. Consultado o 20 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Oort+Cloud+Formation+and+Dynamics&rft.au=Harold+F+Levison&rft.au=Luke+Dones&rft.au=Martin+J+Duncan&rft.au=Paul+R+Weissman&rft.btitle=Comets+II&rft.date=2004&rft.genre=bookitem&rft.pages=153-173&rft.pub=University+of+Arizona+Press&rft_id=http%3A%2F%2Fwww.lpi.usra.edu%2Fbooks%2FCometsII%2F7031.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-julio-36"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-julio_36-0">35,0</a></sup> <sup><a href="#cite_ref-julio_36-1">35,1</a></sup></span> <span class="reference-text"><cite class="citation journal">Julio A. Fernández (2000). "Long-Period Comets and the Oort Cloud". <i>Earth, Moon, and Planets</i> <b>89</b> (1–4): 325–343. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2002EM&P...89..325F">2002EM&P...89..325F</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1023%2FA%3A1021571108658">10.1023/A:1021571108658</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Long-Period+Comets+and+the+Oort+Cloud&rft.au=Julio+A.+Fern%C3%A1ndez&rft.date=2000&rft.genre=article&rft.issue=1%934&rft.jtitle=Earth%2C+Moon%2C+and+Planets&rft.pages=325-343&rft.volume=89&rft_id=info%3Abibcode%2F2002EM%26P...89..325F&rft_id=info%3Adoi%2F10.1023%2FA%3A1021571108658&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><a href="#cite_ref-37">↑</a></span> <span class="reference-text"><cite class="citation journal">Marc Fouchard; Christiane Froeschlé; Giovanni Valsecchi; Hans Rickman (2006). "Long-term effects of the galactic tide on cometary dynamics". <i>Celestial Mechanics and Dynamical Astronomy</i> <b>95</b> (1–4): 299–326. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2006CeMDA..95..299F">2006CeMDA..95..299F</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1007%2Fs10569-006-9027-8">10.1007/s10569-006-9027-8</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Long-term+effects+of+the+galactic+tide+on+cometary+dynamics&rft.au=Christiane+Froeschl%C3%A9&rft.au=Giovanni+Valsecchi&rft.au=Hans+Rickman&rft.au=Marc+Fouchard&rft.date=2006&rft.genre=article&rft.issue=1%934&rft.jtitle=Celestial+Mechanics+and+Dynamical+Astronomy&rft.pages=299-326&rft.volume=95&rft_id=info%3Abibcode%2F2006CeMDA..95..299F&rft_id=info%3Adoi%2F10.1007%2Fs10569-006-9027-8&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><a href="#cite_ref-38">↑</a></span> <span class="reference-text"><cite class="citation journal">Higuchi A.; Kokubo E. & Mukai, T. (2005). "Orbital Evolution of Planetesimals by the Galactic Tide". <i>Bulletin of the American Astronomical Society</i> <b>37</b>: 521. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2005DDA....36.0205H">2005DDA....36.0205H</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Orbital+Evolution+of+Planetesimals+by+the+Galactic+Tide&rft.au=Higuchi+A.&rft.au=Kokubo+E.&rft.au=Mukai%2C+T.&rft.date=2005&rft.genre=article&rft.jtitle=Bulletin+of+the+American+Astronomical+Society&rft.pages=521&rft.volume=37&rft_id=info%3Abibcode%2F2005DDA....36.0205H&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-39"><span class="mw-cite-backlink"><a href="#cite_ref-39">↑</a></span> <span class="reference-text"><cite class="citation journal">Nurmi P.; Valtonen M.J.; Zheng J.Q. (2001). "Periodic variation of Oort Cloud flux and cometary impacts on the Earth and Jupiter". <i>Monthly Notices of the Royal Astronomical Society</i> <b>327</b> (4): 1367–1376. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2001MNRAS.327.1367N">2001MNRAS.327.1367N</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1046%2Fj.1365-8711.2001.04854.x">10.1046/j.1365-8711.2001.04854.x</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Periodic+variation+of+Oort+Cloud+flux+and+cometary+impacts+on+the+Earth+and+Jupiter&rft.au=Nurmi+P.&rft.au=Valtonen+M.J.&rft.au=Zheng+J.Q.&rft.date=2001&rft.genre=article&rft.issue=4&rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.pages=1367-1376&rft.volume=327&rft_id=info%3Abibcode%2F2001MNRAS.327.1367N&rft_id=info%3Adoi%2F10.1046%2Fj.1365-8711.2001.04854.x&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-40"><span class="mw-cite-backlink"><a href="#cite_ref-40">↑</a></span> <span class="reference-text"><cite class="citation journal">John J. Matese & Jack J. Lissauer (2004). <a rel="nofollow" class="external text" href="http://www.ucs.louisiana.edu/~jjm9638/dps2003/I08821w.pdf">"Perihelion evolution of observed new comets implies the dominance of the galactic tide in making Oort Cloud comets discernible"</a> <span style="font-size:85%;">(PDF)</span>. <i>Icarus</i> <b>170</b> (2): 508–513. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2004Icar..170..508M">2004Icar..170..508M</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1016%2Fj.icarus.2004.03.019">10.1016/j.icarus.2004.03.019</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Perihelion+evolution+of+observed+new+comets+implies+the+dominance+of+the+galactic+tide+in+making+Oort+Cloud+comets+discernible&rft.au=Jack+J.+Lissauer&rft.au=John+J.+Matese&rft.date=2004&rft.genre=article&rft.issue=2&rft.jtitle=Icarus&rft.pages=508-513&rft.volume=170&rft_id=http%3A%2F%2Fwww.ucs.louisiana.edu%2F~jjm9638%2Fdps2003%2FI08821w.pdf&rft_id=info%3Abibcode%2F2004Icar..170..508M&rft_id=info%3Adoi%2F10.1016%2Fj.icarus.2004.03.019&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-41"><span class="mw-cite-backlink"><a href="#cite_ref-41">↑</a></span> <span class="reference-text"><cite class="citation journal">Mamajek, Eric E.; Barenfeld, Scott A.; Ivanov, Valentin D. (2015). <a rel="nofollow" class="external text" href="https://authors.library.caltech.edu/55650/1/2041-8205_800_1_L17.pdf">"The Closest Known Flyby of a Star to the Solar System"</a> <span style="font-size:85%;">(PDF)</span>. <i>The Astrophysical Journal</i> <b>800</b> (1): L17. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2015ApJ...800L..17M">2015ApJ...800L..17M</a>. <a href="/wiki/ArXiv" title="ArXiv">arXiv</a>:<a rel="nofollow" class="external text" href="//arxiv.org/abs/1502.04655">1502.04655</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1088%2F2041-8205%2F800%2F1%2FL17">10.1088/2041-8205/800/1/L17</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=The+Closest+Known+Flyby+of+a+Star+to+the+Solar+System&rft.au=Barenfeld%2C+Scott+A.&rft.au=Ivanov%2C+Valentin+D.&rft.aufirst=Eric+E.&rft.aulast=Mamajek&rft.date=2015&rft.genre=article&rft.issue=1&rft.jtitle=The+Astrophysical+Journal&rft.pages=L17&rft.volume=800&rft_id=https%3A%2F%2Fauthors.library.caltech.edu%2F55650%2F1%2F2041-8205_800_1_L17.pdf&rft_id=info%3Aarxiv%2F1502.04655&rft_id=info%3Abibcode%2F2015ApJ...800L..17M&rft_id=info%3Adoi%2F10.1088%2F2041-8205%2F800%2F1%2FL17&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-algol-42"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-algol_42-0">41,0</a></sup> <sup><a href="#cite_ref-algol_42-1">41,1</a></sup></span> <span class="reference-text"><cite class="citation conference">L. A. Molnar; R. L. Mutel (1997). <i>Close Approaches of Stars to the Oort Cloud: Algol and Gliese 710</i>. American Astronomical Society 191st meeting. American Astronomical Society. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1997AAS...191.6906M">1997AAS...191.6906M</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.au=L.+A.+Molnar&rft.au=R.+L.+Mutel&rft.btitle=Close+Approaches+of+Stars+to+the+Oort+Cloud%3A+Algol+and+Gliese+710&rft.date=1997&rft.genre=conference&rft.pub=American+Astronomical+Society&rft_id=info%3Abibcode%2F1997AAS...191.6906M&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-43"><span class="mw-cite-backlink"><a href="#cite_ref-43">↑</a></span> <span class="reference-text"><cite class="citation journal">A. Higuchi; E. Kokubo & T. Mukai (2006). <a rel="nofollow" class="external text" href="https://archive.org/details/sim_astronomical-journal_2006-02_131_2/page/1119">"Scattering of Planetesimals by a Planet: Formation of Comet Cloud Candidates"</a>. <i>Astronomical Journal</i> <b>131</b> (2): 1119–1129. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2006AJ....131.1119H">2006AJ....131.1119H</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F498892">10.1086/498892</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Scattering+of+Planetesimals+by+a+Planet%3A+Formation+of+Comet+Cloud+Candidates&rft.au=A.+Higuchi&rft.au=E.+Kokubo&rft.au=T.+Mukai&rft.date=2006&rft.genre=article&rft.issue=2&rft.jtitle=Astronomical+Journal&rft.pages=1119-1129&rft.volume=131&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsim_astronomical-journal_2006-02_131_2%2Fpage%2F1119&rft_id=info%3Abibcode%2F2006AJ....131.1119H&rft_id=info%3Adoi%2F10.1086%2F498892&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-44"><span class="mw-cite-backlink"><a href="#cite_ref-44">↑</a></span> <span class="reference-text"><cite class="citation journal">J. G. Hills (1984). "Dynamical constraints on the mass and perihelion distance of Nemesis and the stability of its orbit". <i><a href="/wiki/Nature_(revista)" class="mw-redirect" title="Nature (revista)">Nature</a></i> <b>311</b> (5987): 636–638. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1984Natur.311..636H">1984Natur.311..636H</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1038%2F311636a0">10.1038/311636a0</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Dynamical+constraints+on+the+mass+and+perihelion+distance+of+Nemesis+and+the+stability+of+its+orbit&rft.au=J.+G.+Hills&rft.date=1984&rft.genre=article&rft.issue=5987&rft.jtitle=Nature&rft.pages=636-638&rft.volume=311&rft_id=info%3Abibcode%2F1984Natur.311..636H&rft_id=info%3Adoi%2F10.1038%2F311636a0&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-45"><span class="mw-cite-backlink"><a href="#cite_ref-45">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="http://www.mpg.de/4372308/nemsis_myth?page=1">"Nemesis is a myth"</a>. Max Planck Institute. 2011<span class="reference-accessdate">. Consultado o 11 de agosto de 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.btitle=Nemesis+is+a+myth&rft.date=2011&rft.genre=unknown&rft.pub=Max+Planck+Institute&rft_id=http%3A%2F%2Fwww.mpg.de%2F4372308%2Fnemsis_myth%3Fpage%3D1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Tyche2011-060-46"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Tyche2011-060_46-0">45,0</a></sup> <sup><a href="#cite_ref-Tyche2011-060_46-1">45,1</a></sup></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120117110722/http://www.jpl.nasa.gov/news/news.cfm?release=2011-060">"Can WISE Find the Hypothetical 'Tyche'?"</a>. NASA/JPL. 18 de febreiro de 2011. Arquivado dende <a rel="nofollow" class="external text" href="https://www.jpl.nasa.gov/news/news.cfm?release=2011-060">o orixinal</a> o 17 de xaneiro de 2012<span class="reference-accessdate">. Consultado o 15 de xuño de 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.btitle=Can+WISE+Find+the+Hypothetical+%27Tyche%27%3F&rft.genre=unknown&rft.pub=NASA%2FJPL&rft_id=http%3A%2F%2Fwww.jpl.nasa.gov%2Fnews%2Fnews.cfm%3Frelease%3D2011-060&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-47"><span class="mw-cite-backlink"><a href="#cite_ref-47">↑</a></span> <span class="reference-text"><cite class="citation web">John J. Matese & Jack J. Lissauer (6 de maio de 2002). <a rel="nofollow" class="external text" href="http://www.ucs.louisiana.edu/~jjm9638/acm2002/acm2002_05_06.pdf">"Continuing Evidence of an Impulsive Component of Oort Cloud Cometary Flux"</a> <span style="font-size:85%;">(PDF)</span>. University of Louisiana at Lafayette / <a href="/wiki/NASA" title="NASA">NASA</a> Ames Research Center<span class="reference-accessdate">. Consultado o 21 de marzo de 2008</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.au=Jack+J.+Lissauer&rft.au=John+J.+Matese&rft.btitle=Continuing+Evidence+of+an+Impulsive+Component+of+Oort+Cloud+Cometary+Flux&rft.genre=unknown&rft.pub=University+of+Louisiana+at+Lafayette+%2F+NASA+Ames+Research+Center&rft_id=http%3A%2F%2Fwww.ucs.louisiana.edu%2F~jjm9638%2Facm2002%2Facm2002_05_06.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-NASA-20140307-48"><span class="mw-cite-backlink"><a href="#cite_ref-NASA-20140307_48-0">↑</a></span> <span class="reference-text"><cite class="citation journal">K. L., Luhman (7 de marzo de 2014). <a rel="nofollow" class="external text" href="http://iopscience.iop.org/0004-637X/781/1/4?fromSearchPage=true">"A Search For A Distant Companion To The Sun With The Wide-field Infrared Survey Explorer"</a>. <i>The Astrophysical Journal</i> <b>781</b> (1): 4. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2014ApJ...781....4L">2014ApJ...781....4L</a>. <a href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1088%2F0004-637X%2F781%2F1%2F4">10.1088/0004-637X/781/1/4</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=A+Search+For+A+Distant+Companion+To+The+Sun+With+The+Wide-field+Infrared+Survey+Explorer&rft.aufirst=Luhman&rft.aulast=K.+L.&rft.chron=7+de+marzo+de+2014&rft.genre=article&rft.issue=1&rft.jtitle=The+Astrophysical+Journal&rft.pages=4&rft.volume=781&rft_id=http%3A%2F%2Fiopscience.iop.org%2F0004-637X%2F781%2F1%2F4%3FfromSearchPage%3Dtrue&rft_id=info%3Abibcode%2F2014ApJ...781....4L&rft_id=info%3Adoi%2F10.1088%2F0004-637X%2F781%2F1%2F4&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-New_Horizons2006-49"><span class="mw-cite-backlink"><a href="#cite_ref-New_Horizons2006_49-0">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://www.webcitation.org/5x3s4O3KH?url=http://pluto.jhuapl.edu/news_center/news/081706.php">"New Horizons Salutes Voyager"</a>. New Horizons. 17 de agosto de 2006. Arquivado dende <a rel="nofollow" class="external text" href="http://pluto.jhuapl.edu/news_center/news/081706.php">o orixinal</a> o 09 de marzo de 2011<span class="reference-accessdate">. Consultado o 3 de novembro de 2009</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.btitle=New+Horizons+Salutes+Voyager&rft.genre=unknown&rft.pub=New+Horizons&rft_id=http%3A%2F%2Fpluto.jhuapl.edu%2Fnews_center%2Fnews%2F081706.php&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-g.2013sep13-50"><span class="mw-cite-backlink"><a href="#cite_ref-g.2013sep13_50-0">↑</a></span> <span class="reference-text"><cite class="citation news">Clark, Stuart (13 de setembro de 2013). <a rel="nofollow" class="external text" href="https://www.theguardian.com/science/across-the-universe/2013/sep/13/voyager-1-solar-system-great-explorers">"Voyager 1 leaving solar system matches feats of great human explorers"</a>. <i>The Guardian</i>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Voyager+1+leaving+solar+system+matches+feats+of+great+human+explorers&rft.aufirst=Stuart&rft.aulast=Clark&rft.chron=13+de+setembro+de+2013&rft.genre=article&rft.jtitle=The+Guardian&rft_id=https%3A%2F%2Fwww.theguardian.com%2Fscience%2Facross-the-universe%2F2013%2Fsep%2F13%2Fvoyager-1-solar-system-great-explorers&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-51"><span class="mw-cite-backlink"><a href="#cite_ref-51">↑</a></span> <span class="reference-text"><cite class="citation news"><a rel="nofollow" class="external text" href="http://www.spacetoday.org/SolSys/Voyagers20years.html">"Voyagers are leaving the Solar System"</a>. <i>Space Today</i>. 2011<span class="reference-accessdate">. Consultado o 29 de maio de 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Voyagers+are+leaving+the+Solar+System&rft.date=2011&rft.genre=article&rft.jtitle=Space+Today&rft_id=http%3A%2F%2Fwww.spacetoday.org%2FSolSys%2FVoyagers20years.html&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-ut.104717-52"><span class="mw-cite-backlink"><a href="#cite_ref-ut.104717_52-0">↑</a></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="http://www.universetoday.com/104717/its-official-voyager-1-is-now-in-interstellar-space/">"It's Official: Voyager 1 Is Now In Interstellar Space"</a>. <i>UniverseToday</i><span class="reference-accessdate">. Consultado o 27 de abril de 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=It%27s+Official%3A+Voyager+1+Is+Now+In+Interstellar+Space&rft.genre=unknown&rft.jtitle=UniverseToday&rft_id=http%3A%2F%2Fwww.universetoday.com%2F104717%2Fits-official-voyager-1-is-now-in-interstellar-space%2F&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Ghose2013-53"><span class="mw-cite-backlink"><a href="#cite_ref-Ghose2013_53-0">↑</a></span> <span class="reference-text"><cite class="citation web">Ghose, Tia (13 de setembro de 2013). <a rel="nofollow" class="external text" href="http://www.space.com/22797-voyager-1-interstellar-space-nasa-proof.html">"Voyager 1 Really Is In Interstellar Space: How NASA Knows"</a>. <i>Space.com</i>. TechMedia Network<span class="reference-accessdate">. Consultado o 14 de setembro de 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Voyager+1+Really+Is+In+Interstellar+Space%3A+How+NASA+Knows&rft.aufirst=Tia&rft.aulast=Ghose&rft.chron=13+de+setembro+de+2013&rft.genre=unknown&rft.jtitle=Space.com&rft_id=http%3A%2F%2Fwww.space.com%2F22797-voyager-1-interstellar-space-nasa-proof.html&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-How_We_Know-54"><span class="mw-cite-backlink"><a href="#cite_ref-How_We_Know_54-0">↑</a></span> <span class="reference-text"><cite class="citation web">Cook, J.-R (12 de setembro de 2013). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130915060510/http://www.jpl.nasa.gov/news/news.php?release=2013-278">"How Do We Know When Voyager Reaches Interstellar Space?"</a>. NASA / Jet Propulsion Lab. Arquivado dende <a rel="nofollow" class="external text" href="https://www.jpl.nasa.gov/news/news.php?release=2013-278">o orixinal</a> o 15 de setembro de 2013<span class="reference-accessdate">. Consultado o 15 de setembro de 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.aufirst=J.-R&rft.aulast=Cook&rft.btitle=How+Do+We+Know+When+Voyager+Reaches+Interstellar+Space%3F&rft.genre=unknown&rft.pub=NASA+%2F+Jet+Propulsion+Lab&rft_id=http%3A%2F%2Fwww.jpl.nasa.gov%2Fnews%2Fnews.php%3Frelease%3D2013-278&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-55"><span class="mw-cite-backlink"><a href="#cite_ref-55">↑</a></span> <span class="reference-text"><cite class="citation journal">Nock, K. T. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070930183557/http://pdf.aiaa.org/preview/1987/PV1987_1049.pdf">"Tau - A Mission to a Thousand Astronomical Units"</a> <span style="font-size:85%;">(PDF)</span>. Pasadena, California: Jet Propulsion Laboratory. Arquivado dende <a rel="nofollow" class="external text" href="http://pdf.aiaa.org/preview/1987/PV1987_1049.pdf">o orixinal</a> <span style="font-size:85%;">(PDF)</span> o 30 de setembro de 2007<span class="reference-accessdate">. Consultado o 27 de outubro de 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.atitle=Tau+-+A+Mission+to+a+Thousand+Astronomical+Units&rft.aufirst=K.+T.&rft.aulast=Nock&rft.genre=article&rft_id=http%3A%2F%2Fpdf.aiaa.org%2Fpreview%2F1987%2FPV1987_1049.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-whipple.cfa.harvard.edu-56"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-whipple.cfa.harvard.edu_56-0">55,0</a></sup> <sup><a href="#cite_ref-whipple.cfa.harvard.edu_56-1">55,1</a></sup></span> <span class="reference-text"><cite class="citation web">Charles Alcock; et al. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20151117031224/http://whipple.cfa.harvard.edu/inc/documents/Alcock_AGUPoster_2014dec.pdf">"The Whipple Mission: Exploring the Oort Cloud and the Kuiper Belt"</a> <span style="font-size:85%;">(PDF)</span>. Arquivado dende <a rel="nofollow" class="external text" href="http://whipple.cfa.harvard.edu/inc/documents/Alcock_AGUPoster_2014dec.pdf">o orixinal</a> <span style="font-size:85%;">(PDF)</span> o 17 de novembro de 2015<span class="reference-accessdate">. Consultado o 12 de novembro de 2015</span>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fgl.wikipedia.org%3ANube+de+Oort&rft.au=Almus+Kenter&rft.au=Amy+Trangsrud&rft.au=Cate+Heneghan&rft.au=Charles+Alcock&rft.au=Hilke+Schlichting&rft.au=James+Mcguire&rft.au=Jan+Vrtilek&rft.au=John+Livingston&rft.au=Matthew+Holman&rft.au=Matthew+Payne&rft.au=Michael+Brown&rft.au=Michael+Werner&rft.au=Paul+Nulsen&rft.au=Ralph+Kraft&rft.au=Roger+Lee&rft.au=Ruth+Murray-Clay&rft.au=Stephen+Murray&rft.au=Tom+Gauron&rft.btitle=The+Whipple+Mission%3A+Exploring+the+Oort+Cloud+and+the+Kuiper+Belt&rft.genre=unknown&rft_id=http%3A%2F%2Fwhipple.cfa.harvard.edu%2Finc%2Fdocuments%2FAlcock_AGUPoster_2014dec.pdf&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol></div> <table role="presentation" class="mbox-small plainlinks sistersitebox" style="background-color:var(--background-color-neutral-subtle, #f8f9fa);border:1px solid var(--border-color-base, #a2a9b1);color:inherit"> <tbody><tr> <td class="mbox-image"><span class="noviewer" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></td> <td class="mbox-text plainlist"><a href="https://commons.wikimedia.org/wiki/Portada_galega" class="extiw" title="commons:Portada galega">Wikimedia Commons</a> ten máis contidos multimedia na categoría:  <i><b><a href="https://commons.wikimedia.org/wiki/Category:Oort_cloud" class="extiw" title="commons:Category:Oort cloud">Nube de Oort</a> <span typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q40864" title="Modificar a ligazón no Wikidata"><img alt="Modificar a ligazón no Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/12px-Arbcom_ru_editing.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/18px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/24px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></b></i></td></tr> </tbody></table> <div role="navigation" class="navbox" aria-labelledby="Sistema_solar" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div class="plainlinks hlist navbar mini"><ul><li class="nv-ver"><a href="/wiki/Modelo:Sistema_Solar" title="Modelo:Sistema 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data-file-height="36" usemap="#ImageMap_52cfa8499bc2800d" /></span><map name="ImageMap_52cfa8499bc2800d"><area href="/wiki/Sol" shape="rect" coords="0,0,90,35" alt="Sol" title="Sol" /><area href="/wiki/Mercurio_(planeta)" shape="circle" coords="112,18,6" alt="Mercurio" title="Mercurio" /><area href="/wiki/Venus" shape="circle" coords="153,18,8" alt="Venus" title="Venus" /><area href="/wiki/L%C3%BAa" shape="circle" coords="204,10,4" alt="Lúa" title="Lúa" /><area href="/wiki/Terra" shape="circle" coords="195,18,8" alt="Terra" title="Terra" /><area href="/wiki/Marte" shape="circle" coords="233,18,8" alt="Marte" title="Marte" /><area href="/wiki/L%C3%BAas_de_Marte" shape="circle" coords="241,13,3" alt="Phobos e Deimos" title="Phobos e Deimos" /><area href="/wiki/Ceres_(planeta_anano)" shape="circle" coords="271,18,5" alt="Ceres" title="Ceres" /><area href="/wiki/Cinto_de_asteroides" shape="rect" coords="256,0,288,35" alt="Cinto de asteroides" title="Cinto de asteroides" /><area href="/wiki/X%C3%BApiter" shape="circle" coords="316,19,15" alt="Xúpiter" title="Xúpiter" /><area href="/wiki/L%C3%BAas_de_X%C3%BApiter" shape="circle" coords="329,6,6" alt="Lúas de Xúpiter" title="Lúas de Xúpiter" /><area href="/wiki/Aneis_de_X%C3%BApiter" shape="rect" coords="298,18,335,20" alt="Aneis de Xúpiter" title="Aneis de Xúpiter" /><area href="/wiki/Saturno" shape="circle" coords="372,18,12" alt="Saturno" title="Saturno" /><area href="/wiki/L%C3%BAas_de_Saturno" shape="circle" coords="381,7,6" alt="Lúas de Saturno" title="Lúas de Saturno" /><area href="/wiki/Aneis_de_Saturno" shape="rect" coords="353,5,389,31" alt="Aneis de Saturno" title="Aneis de Saturno" /><area href="/wiki/Urano" shape="circle" coords="418,18,12" alt="Urano" title="Urano" /><area href="/wiki/L%C3%BAas_de_Urano" shape="circle" coords="427,10,6" alt="Lúas de Urano" title="Lúas de Urano" /><area href="/wiki/Aneis_de_Urano" shape="rect" coords="408,4,429,34" alt="Aneis de Urano" title="Aneis de Urano" /><area href="/wiki/Neptuno" shape="circle" coords="462,18,12" alt="Neptuno" title="Neptuno" /><area href="/wiki/L%C3%BAas_de_Neptuno" shape="circle" coords="471,10,5" alt="Lúas de Neptuno" title="Lúas de Neptuno" /><area href="/wiki/Aneis_de_Neptuno" shape="rect" coords="441,9,485,28" alt="Aneis de Neptuno" title="Aneis de Neptuno" /><area href="/wiki/Plut%C3%B3n" shape="circle" coords="504,18,12" alt="Plutón" title="Plutón" /><area href="/wiki/L%C3%BAas_de_Plut%C3%B3n" shape="circle" coords="510,13,8" alt="Lúas de Plutón" title="Lúas de Plutón" /><area href="/wiki/Haumea_(planeta_anano)" shape="circle" coords="534,18,12" alt="Haumea" title="Haumea" /><area href="/wiki/L%C3%BAas_de_Haumea" shape="circle" coords="540,13,8" alt="Lúas de Haumea" title="Lúas de Haumea" /><area href="/wiki/Makemake_(planeta_anano)" shape="circle" coords="567,18,12" alt="Makemake" title="Makemake" /><area href="/wiki/S/2015_(136472)_1" shape="circle" coords="571,13,8" alt="S/2015 (136472) 1" title="S/2015 (136472) 1" /><area href="/wiki/Cinto_de_Kuiper" shape="rect" coords="490,0,580,35" alt="Cinto de Kuiper" title="Cinto de Kuiper" /><area href="/wiki/Eris_(planeta_anano)" shape="circle" coords="596,18,12" alt="Eris" title="Eris" /><area href="/wiki/Dysnomia_(l%C3%BAa)" shape="circle" coords="602,13,8" alt="Dysnomia" title="Dysnomia" /><area href="/wiki/Disco_disperso" shape="rect" coords="581,0,610,35" alt="Disco disperso" title="Disco disperso" /><area href="/wiki/Nube_de_Hills" shape="rect" coords="623,0,640,35" alt="Nube de Hills" title="Nube de Hills" /><area href="/wiki/Nube_de_Oort" shape="rect" coords="641,0,666,35" alt="Nube de Oort" title="Nube de Oort" /></map><figcaption></figcaption></figure></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center"><div class="hlist" style="margin-left: 0em;"> <ul><li><a href="/wiki/Sol" title="Sol">Sol</a><br /></li> <li><br /><a href="/wiki/Heliosfera" title="Heliosfera">Heliosfera</a></li></ul> </div></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><div class="hlist" style="margin-left: 0em;"> <ul><li><a href="/wiki/Planeta" title="Planeta">Planetas</a><br /> <ul><li><span style="font-size:80%;"><a href="/wiki/Anel_(astronom%C3%ADa)" title="Anel (astronomía)">Aneis</a></span></li> <li><span style="font-size:80%;"><a href="/wiki/Sat%C3%A9lite_natural" title="Satélite natural">Lúas</a></span></li></ul></li></ul> </div></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><b><a href="/wiki/Mercurio_(planeta)" title="Mercurio (planeta)">Mercurio</a></b></li> <li><b><a href="/wiki/Venus" title="Venus">Venus</a></b></li> <li><b><a href="/wiki/Terra" title="Terra">Terra</a></b> <ul><li><a href="/wiki/L%C3%BAa" title="Lúa">1 lúa</a></li></ul></li> <li><b><a href="/wiki/Marte" title="Marte">Marte</a></b> <ul><li><a href="/wiki/L%C3%BAas_de_Marte" title="Lúas de Marte">2 lúas</a>: <a href="/wiki/Fobos_(l%C3%BAa)" title="Fobos (lúa)">Fobos</a></li> <li><a href="/wiki/Deimos_(l%C3%BAa)" title="Deimos (lúa)">Deimos</a></li></ul></li> <li><b><a href="/wiki/X%C3%BApiter" title="Xúpiter">Xúpiter</a></b> <ul><li><a href="/wiki/Aneis_de_X%C3%BApiter" title="Aneis de Xúpiter">Aneis</a></li> <li><a href="/wiki/L%C3%BAas_de_X%C3%BApiter" title="Lúas de Xúpiter">95 lúas</a>: <a href="/wiki/Gan%C3%ADmedes_(l%C3%BAa)" class="mw-redirect" title="Ganímedes (lúa)">Ganímedes</a></li> <li><a href="/wiki/Calisto_(l%C3%BAa)" title="Calisto (lúa)">Calisto</a></li> <li><a href="/wiki/%C3%8Do_(l%C3%BAa)" title="Ío (lúa)">Ío</a></li> <li><a href="/wiki/Europa_(l%C3%BAa)" title="Europa (lúa)">Europa</a></li></ul></li> <li><b><a href="/wiki/Saturno" title="Saturno">Saturno</a></b> <ul><li><a href="/wiki/Aneis_de_Saturno" title="Aneis de Saturno">Aneis</a></li> <li><a href="/wiki/L%C3%BAas_de_Saturno" title="Lúas de Saturno">146 lúas</a>: <a href="/wiki/Tit%C3%A1n_(l%C3%BAa)" title="Titán (lúa)">Titán</a></li> <li><a href="/wiki/Rea_(l%C3%BAa)" title="Rea (lúa)">Rea</a></li> <li><a href="/wiki/Iapeto_(l%C3%BAa)" class="mw-redirect" title="Iapeto (lúa)">Iapeto</a></li> <li><a href="/wiki/Dione" title="Dione">Dione</a></li> <li><a href="/wiki/Tetis_(l%C3%BAa)" title="Tetis (lúa)">Tetis</a></li> <li><a href="/wiki/Enc%C3%A9lado_(l%C3%BAa)" title="Encélado (lúa)">Encélado</a></li> <li><a href="/wiki/Mimas" title="Mimas">Mimas</a></li></ul></li> <li><b><a href="/wiki/Urano" title="Urano">Urano</a></b> <ul><li><a href="/wiki/Aneis_de_Urano" title="Aneis de Urano">Aneis</a></li> <li><a href="/wiki/L%C3%BAas_de_Urano" title="Lúas de Urano">28 lúas</a>: <a href="/wiki/Titania_(l%C3%BAa)" title="Titania (lúa)">Titania</a></li> <li><a href="/wiki/Ober%C3%B3n_(l%C3%BAa)" title="Oberón (lúa)">Oberón</a></li> <li><a href="/wiki/Umbriel_(l%C3%BAa)" title="Umbriel (lúa)">Umbriel</a></li> <li><a href="/wiki/Ariel_(l%C3%BAa)" title="Ariel (lúa)">Ariel</a></li> <li><a href="/wiki/Miranda_(l%C3%BAa)" title="Miranda (lúa)">Miranda</a></li></ul></li> <li><b><a href="/wiki/Neptuno" title="Neptuno">Neptuno</a></b> <ul><li><a href="/wiki/Aneis_de_Neptuno" title="Aneis de Neptuno">Aneis</a></li> <li><a href="/wiki/L%C3%BAas_de_Neptuno" title="Lúas de Neptuno">16 lúas</a>: <a href="/wiki/Trit%C3%B3n_(l%C3%BAa)" title="Tritón (lúa)">Tritón</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Planetoide" title="Planetoide">Planetas<br />menores</a></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Planeta_anano" title="Planeta anano">Planetas ananos</a></th><td class="navbox-list navbox-even" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><b><a href="/wiki/Ceres_(planeta_anano)" title="Ceres (planeta anano)">Ceres</a></b></li> <li><b><a href="/wiki/Plut%C3%B3n" title="Plutón">Plutón</a></b> <ul><li><a href="/wiki/L%C3%BAas_de_Plut%C3%B3n" title="Lúas de Plutón">5 lúas</a>: <a href="/wiki/Hydra_(l%C3%BAa)" title="Hydra (lúa)">Hydra</a></li> <li><a href="/wiki/C%C3%A9rbero_(l%C3%BAa)" title="Cérbero (lúa)">Cérbero</a></li> <li><a href="/wiki/Nix_(l%C3%BAa)" title="Nix (lúa)">Nix</a></li> <li><a href="/wiki/Estixia_(l%C3%BAa)" title="Estixia (lúa)">Estixia</a></li> <li><a href="/wiki/Caronte_(l%C3%BAa)" title="Caronte (lúa)">Caronte</a></li></ul></li> <li><b><a href="/wiki/Haumea_(planeta_anano)" title="Haumea (planeta anano)">Haumea</a></b> <ul><li><a href="/wiki/L%C3%BAas_de_Haumea" title="Lúas de Haumea">2 lúas</a>: <a href="/wiki/Hi%CA%BBiaka_(l%C3%BAa)" title="Hiʻiaka (lúa)">Hiʻiaka</a></li> <li><a href="/wiki/Namaka_(l%C3%BAa)" title="Namaka (lúa)">Namaka</a></li></ul></li> <li><b><a href="/wiki/Makemake_(planeta_anano)" title="Makemake (planeta anano)">Makemake</a></b> <ul><li><a href="/w/index.php?title=S/2015_(136472)_1&action=edit&redlink=1" class="new" title="S/2015 (136472) 1 (a páxina aínda non existe)">Lúa</a></li></ul></li> <li><b><a href="/wiki/Eris_(planeta_anano)" title="Eris (planeta anano)">Eris</a></b> <ul><li><a href="/wiki/Disnomia_(l%C3%BAa)" title="Disnomia (lúa)">Disnomia</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Asteroide" title="Asteroide">Asteroides</a><br /><span style="font-size:80%;"><a href="/wiki/Corpo_menor_do_sistema_solar" title="Corpo menor do sistema solar">(Corpos menores do<br />sistema solar)</a></span></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Asteroides notables</th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><b><a href="/wiki/4_Vesta" title="4 Vesta">Vesta</a></b></li> <li><b><a href="/w/index.php?title=951_Gaspra&action=edit&redlink=1" class="new" title="951 Gaspra (a páxina aínda non existe)">Gaspra</a></b></li> <li><b><a href="/wiki/243_Ida" title="243 Ida">Ida</a></b></li> <li><b><a href="/wiki/99942_Apophis" title="99942 Apophis">Apohis</a></b></li> <li><b><a href="/w/index.php?title=22_Kalliope&action=edit&redlink=1" class="new" title="22 Kalliope (a páxina aínda non existe)">Kalliope</a></b></li> <li><a href="/wiki/2_Pallas" title="2 Pallas">Pallas</a></li> <li><a href="/w/index.php?title=3_Xuno&action=edit&redlink=1" class="new" title="3 Xuno (a páxina aínda non existe)">3 Xuno</a></li> <li><a href="/wiki/10_Hygiea" title="10 Hygiea">Hygiea</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Grupos e familias</th><td class="navbox-list navbox-even" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=Obxecto_pr%C3%B3ximo_%C3%A1_Terra&action=edit&redlink=1" class="new" title="Obxecto próximo á Terra (a páxina aínda non existe)">Obxectos próximos á Terra</a></li> <li><b><a href="/wiki/Cinto_de_asteroides" title="Cinto de asteroides">Cinto de asteroides</a></b></li> <li><b><a href="/wiki/Asteroide_troiano" title="Asteroide troiano">Troianos</a></b> <ul><li><a href="/w/index.php?title=Troiano_de_Venus&action=edit&redlink=1" class="new" title="Troiano de Venus (a páxina aínda non existe)">Venus</a></li> <li><a href="/w/index.php?title=2010_TK7&action=edit&redlink=1" class="new" title="2010 TK7 (a páxina aínda non existe)">Terra</a></li> <li><a href="/w/index.php?title=Troiano_de_Marte&action=edit&redlink=1" class="new" title="Troiano de Marte (a páxina aínda non existe)">Marte</a></li> <li><a href="/w/index.php?title=Troiano_de_X%C3%BApiter&action=edit&redlink=1" class="new" title="Troiano de Xúpiter (a páxina aínda non existe)">Xúpiter</a></li> <li><a href="/w/index.php?title=Troiano_de_Urano&action=edit&redlink=1" class="new" title="Troiano de Urano (a páxina aínda non existe)">Urano</a></li> <li><a href="/wiki/Troiano_de_Neptuno" title="Troiano de Neptuno">Neptuno</a></li></ul></li> <li><b><a href="/wiki/Centauro_(astronom%C3%ADa)" title="Centauro (astronomía)">Centauros</a></b></li> <li><a href="/wiki/Sat%C3%A9lite_asteroidal" title="Satélite asteroidal">Satélites asteroidais</a></li> <li><a href="/wiki/Meteoroide" title="Meteoroide">Meteoroides</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Obxecto_transneptuniano" title="Obxecto transneptuniano">Obxectos<br />transneptunianos</a></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cinto_de_Kuiper" title="Cinto de Kuiper">Cinto de Kuiper</a></th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><b><a href="/wiki/Plutino" title="Plutino">Plutinos</a></b> <ul><li><a href="/wiki/90482_Orcus" title="90482 Orcus">Orcus</a></li> <li><a href="/wiki/28978_Ixion" title="28978 Ixion">Ixion</a></li></ul></li> <li><b><a href="/wiki/Cubewano" title="Cubewano">Cubewanos</a></b> <ul><li><span style="white-space:nowrap"><a href="/w/index.php?title=(55637)_2002_UX25&action=edit&redlink=1" class="new" title="(55637) 2002 UX25 (a páxina aínda non existe)">2002 UX<sub>25</sub></a></span></li> <li><a href="/w/index.php?title=20000_Varuna&action=edit&redlink=1" class="new" title="20000 Varuna (a páxina aínda non existe)">Varuna</a></li> <li><a href="/w/index.php?title=15760_Albion&action=edit&redlink=1" class="new" title="15760 Albion (a páxina aínda non existe)">Albion</a></li> <li><span style="white-space:nowrap"><a href="/w/index.php?title=(55636)_2002_TX300&action=edit&redlink=1" class="new" title="(55636) 2002 TX300 (a páxina aínda non existe)">2002 TX<sub>300</sub></a></span></li> <li><a href="/wiki/Quaoar" title="Quaoar">Quaoar</a></li> <li><a href="/wiki/38628_Huya" title="38628 Huya">Huya</a></li> <li><span style="white-space:nowrap"><a href="/wiki/(55565)_2002_AW197" title="(55565) 2002 AW197">2002 AW<sub>197</sub></a></span></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Disco_disperso" title="Disco disperso">Disco disperso</a></th><td class="navbox-list navbox-even" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><span style="white-space:nowrap"><a href="/wiki/(84522)_2002_TC302" title="(84522) 2002 TC302">2002 TC<sub>302</sub></a></span></li> <li><span style="white-space:nowrap"><a href="/w/index.php?title=2004_XR190&action=edit&redlink=1" class="new" title="2004 XR190 (a páxina aínda non existe)">2004 XR<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">190</span></span></a></span></li> <li><a href="/wiki/225088_Gonggong" title="225088 Gonggong">Gonggong</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Outros</th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><b><a href="/wiki/Sednoide" title="Sednoide">Sednoides</a></b> <ul><li><a href="/wiki/Sedna" title="Sedna">Sedna</a></li> <li><span style="white-space:nowrap"><a href="/w/index.php?title=2012_VP113&action=edit&redlink=1" class="new" title="2012 VP113 (a páxina aínda non existe)">2012 VP<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">113</span></span></a></span></li></ul></li> <li><b><a href="/wiki/Obxecto_separado" title="Obxecto separado">Obxectos separados</a></b></li> <li><b><a href="/wiki/Damocloide" title="Damocloide">Damocloides</a></b></li> <li><b><a class="mw-selflink selflink">Obxectos da Nube de Oort</a></b> <ul><li><a href="/w/index.php?title=Nube_de_Hills&action=edit&redlink=1" class="new" title="Nube de Hills (a páxina aínda non existe)">Nube de Hills</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cometa" title="Cometa">Cometas</a></th><td class="navbox-list navbox-even" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=Cometa_do_cinto_principal&action=edit&redlink=1" class="new" title="Cometa do cinto principal (a páxina aínda non existe)">Cinto principal</a></li> <li><a href="/w/index.php?title=Cometa_rasante&action=edit&redlink=1" class="new" title="Cometa rasante (a páxina aínda non existe)">Rasantes</a></li> <li><a href="/w/index.php?title=Gran_cometa&action=edit&redlink=1" class="new" title="Gran cometa (a páxina aínda non existe)">Grandes</a></li> <li><a href="/w/index.php?title=Cometa_extinto&action=edit&redlink=1" class="new" title="Cometa extinto (a páxina aínda non existe)">Extintos</a></li> <li><a href="/w/index.php?title=Cometa_perdido&action=edit&redlink=1" class="new" title="Cometa perdido (a páxina aínda non existe)">Perdidos</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center">Obxectos hipotéticos</th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Planeta_Nove" title="Planeta Nove">Planeta Nove</a></li> <li><a href="/w/index.php?title=Quinto_xigante_gasoso&action=edit&redlink=1" class="new" title="Quinto xigante gasoso (a páxina aínda non existe)">Quinto xigante gasoso</a></li> <li><a href="/w/index.php?title=Vulcanoide&action=edit&redlink=1" class="new" title="Vulcanoide (a páxina aínda non existe)">Vulcanoides</a></li> <li><a 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