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class="vector-toc-numb">1</span> <span>Historie</span> </div> </a> <button aria-controls="toc-Historie-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underafsnit Historie</span> </button> <ul id="toc-Historie-sublist" class="vector-toc-list"> <li id="toc-Fejlagtige_rapporter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fejlagtige_rapporter"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Fejlagtige rapporter</span> </div> </a> <ul id="toc-Fejlagtige_rapporter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Den_første_bekræftede_exoplanet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Den_første_bekræftede_exoplanet"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Den første bekræftede exoplanet</span> </div> </a> <ul id="toc-Den_første_bekræftede_exoplanet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Pulsarplaneter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Pulsarplaneter"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Pulsarplaneter</span> </div> </a> <ul id="toc-Pulsarplaneter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Planeter_omkring_hovedseriestjerner" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Planeter_omkring_hovedseriestjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Planeter omkring hovedseriestjerner</span> </div> </a> <ul id="toc-Planeter_omkring_hovedseriestjerner-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Påvisning_af_exoplaneter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Påvisning_af_exoplaneter"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Påvisning af exoplaneter</span> </div> </a> <ul id="toc-Påvisning_af_exoplaneter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Betegnelser_for_planeter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Betegnelser_for_planeter"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Betegnelser for planeter</span> </div> </a> <ul id="toc-Betegnelser_for_planeter-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exoplaneternes_generelle_træk" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exoplaneternes_generelle_træk"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Exoplaneternes generelle træk</span> </div> </a> <ul id="toc-Exoplaneternes_generelle_træk-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Jordlignende_exoplaneter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Jordlignende_exoplaneter"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Jordlignende exoplaneter</span> </div> </a> <button aria-controls="toc-Jordlignende_exoplaneter-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underafsnit Jordlignende exoplaneter</span> </button> <ul id="toc-Jordlignende_exoplaneter-sublist" class="vector-toc-list"> <li id="toc-Liv_på_exoplanter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Liv_på_exoplanter"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Liv på exoplanter</span> </div> </a> <ul id="toc-Liv_på_exoplanter-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Exoplaneter_i_den_beboelige_zone" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exoplaneter_i_den_beboelige_zone"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Exoplaneter i den beboelige zone</span> </div> </a> <ul id="toc-Exoplaneter_i_den_beboelige_zone-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Milepæle_og_rekorder_blandt_exoplaneter" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Milepæle_og_rekorder_blandt_exoplaneter"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Milepæle og rekorder blandt exoplaneter</span> </div> </a> <button aria-controls="toc-Milepæle_og_rekorder_blandt_exoplaneter-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underafsnit Milepæle og rekorder blandt exoplaneter</span> </button> <ul id="toc-Milepæle_og_rekorder_blandt_exoplaneter-sublist" class="vector-toc-list"> <li id="toc-Kepler-186f" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Kepler-186f"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Kepler-186f</span> </div> </a> <ul id="toc-Kepler-186f-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HD_209458_b" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HD_209458_b"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.2</span> <span>HD 209458 b</span> </div> </a> <ul id="toc-HD_209458_b-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-PSR_B1620-26c" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#PSR_B1620-26c"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.3</span> <span>PSR B1620-26c</span> </div> </a> <ul id="toc-PSR_B1620-26c-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-My_Arae_d" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#My_Arae_d"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.4</span> <span>My Arae d</span> </div> </a> <ul id="toc-My_Arae_d-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-TrES-1" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#TrES-1"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.5</span> <span>TrES-1</span> </div> </a> <ul id="toc-TrES-1-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Gliese_876_og_dens_planetsystem" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Gliese_876_og_dens_planetsystem"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.6</span> <span>Gliese 876 og dens planetsystem</span> </div> </a> <ul id="toc-Gliese_876_og_dens_planetsystem-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HD_149026_b" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HD_149026_b"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.7</span> <span>HD 149026 b</span> </div> </a> <ul id="toc-HD_149026_b-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HD_188753_Ab" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HD_188753_Ab"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.8</span> <span>HD 188753 Ab</span> </div> </a> <ul id="toc-HD_188753_Ab-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-OGLE-2005-BLG-390Lb" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#OGLE-2005-BLG-390Lb"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.9</span> <span>OGLE-2005-BLG-390Lb</span> </div> </a> <ul id="toc-OGLE-2005-BLG-390Lb-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-HAT-P-1b" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HAT-P-1b"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.10</span> <span>HAT-P-1b</span> </div> </a> <ul id="toc-HAT-P-1b-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-SWEEPS-10" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#SWEEPS-10"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.11</span> <span>SWEEPS-10</span> </div> </a> <ul id="toc-SWEEPS-10-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Tau_Boötis_b" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Tau_Boötis_b"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.12</span> <span>Tau Boötis b</span> </div> </a> <ul id="toc-Tau_Boötis_b-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Se_også" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Se_også"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Se også</span> </div> </a> <ul id="toc-Se_også-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referencer" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referencer"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Referencer</span> </div> </a> <ul id="toc-Referencer-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Eksterne_henvisninger" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Eksterne_henvisninger"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Eksterne henvisninger</span> </div> </a> <ul id="toc-Eksterne_henvisninger-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="Indhold" 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="Vis/skjul indholdsfortegnelsen" > <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">Vis/skjul indholdsfortegnelsen</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">Exoplanet</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="Gå til en artikel på et andet sprog. Tilgængelig på 100 sprog" > <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-100" 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">100 sprog</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/Eksoplaneet" title="Eksoplaneet – afrikaans" lang="af" hreflang="af" data-title="Eksoplaneet" 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/Exoplaneta" title="Exoplaneta – aragonsk" lang="an" hreflang="an" data-title="Exoplaneta" data-language-autonym="Aragonés" data-language-local-name="aragonsk" 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/%D9%83%D9%88%D9%83%D8%A8_%D8%BA%D9%8A%D8%B1_%D8%B4%D9%85%D8%B3%D9%8A" title="كوكب غير شمسي – arabisk" lang="ar" hreflang="ar" data-title="كوكب غير شمسي" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Planeta_estrasolar" title="Planeta estrasolar – asturisk" lang="ast" hreflang="ast" data-title="Planeta estrasolar" data-language-autonym="Asturianu" data-language-local-name="asturisk" 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/Ekzoplanet" title="Ekzoplanet – aserbajdsjansk" lang="az" hreflang="az" data-title="Ekzoplanet" data-language-autonym="Azərbaycanca" data-language-local-name="aserbajdsjansk" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%B0%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Экзапланета – belarusisk" lang="be" hreflang="be" data-title="Экзапланета" data-language-autonym="Беларуская" data-language-local-name="belarusisk" 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%AD%D0%BA%D0%B7%D0%B0%D0%BF%D0%BB%D1%8F%D0%BD%D1%8D%D1%82%D0%B0" title="Экзаплянэта – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Экзаплянэта" 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%95%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Екзопланета – bulgarsk" lang="bg" hreflang="bg" data-title="Екзопланета" data-language-autonym="Български" data-language-local-name="bulgarsk" 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%AC%E0%A6%B9%E0%A6%BF%E0%A6%B0%E0%A7%8D%E0%A6%97%E0%A7%8D%E0%A6%B0%E0%A6%B9" title="বহির্গ্রহ – bengali" lang="bn" hreflang="bn" data-title="বহির্গ্রহ" data-language-autonym="বাংলা" data-language-local-name="bengali" 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/Ezplanedenn" title="Ezplanedenn – bretonsk" lang="br" hreflang="br" data-title="Ezplanedenn" data-language-autonym="Brezhoneg" data-language-local-name="bretonsk" 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/Vansolarna_planeta" title="Vansolarna planeta – bosnisk" lang="bs" hreflang="bs" data-title="Vansolarna planeta" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Planeta_extrasolar" title="Planeta extrasolar – catalansk" lang="ca" hreflang="ca" data-title="Planeta extrasolar" data-language-autonym="Català" data-language-local-name="catalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%BE%DB%95%D8%B3%D8%A7%D8%B1%DB%95_%D8%AF%DB%95%D8%B1%DB%95%DA%A9%DB%8C%DB%8C%DB%95%DA%A9%D8%A7%D9%86" title="ھەسارە دەرەکییەکان – sorani" lang="ckb" hreflang="ckb" data-title="ھەسارە دەرەکییەکان" data-language-autonym="کوردی" data-language-local-name="sorani" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Exoplaneta" title="Exoplaneta – tjekkisk" lang="cs" hreflang="cs" data-title="Exoplaneta" data-language-autonym="Čeština" data-language-local-name="tjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cu mw-list-item"><a href="https://cu.wikipedia.org/wiki/%D0%84%D1%AF%D1%A1%D0%BF%D0%BB%D0%B0%D0%BD%D0%B8%D1%82%D0%B0" title="Єѯѡпланита – kirkeslavisk" lang="cu" hreflang="cu" data-title="Єѯѡпланита" data-language-autonym="Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ" data-language-local-name="kirkeslavisk" class="interlanguage-link-target"><span>Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Экзопланета – tjuvasjisk" lang="cv" hreflang="cv" data-title="Экзопланета" data-language-autonym="Чӑвашла" data-language-local-name="tjuvasjisk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Planed_allheulol" title="Planed allheulol – walisisk" lang="cy" hreflang="cy" data-title="Planed allheulol" data-language-autonym="Cymraeg" data-language-local-name="walisisk" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Exoplanet" title="Exoplanet – tysk" lang="de" hreflang="de" data-title="Exoplanet" data-language-autonym="Deutsch" data-language-local-name="tysk" 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%95%CE%BE%CF%89%CE%B7%CE%BB%CE%B9%CE%B1%CE%BA%CF%8C%CF%82_%CF%80%CE%BB%CE%B1%CE%BD%CE%AE%CF%84%CE%B7%CF%82" title="Εξωηλιακός πλανήτης – græsk" lang="el" hreflang="el" data-title="Εξωηλιακός πλανήτης" data-language-autonym="Ελληνικά" data-language-local-name="græsk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Exoplanet" title="Exoplanet – engelsk" lang="en" hreflang="en" data-title="Exoplanet" data-language-autonym="English" data-language-local-name="engelsk" 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/Ekstersunsistema_planedo" title="Ekstersunsistema planedo – esperanto" lang="eo" hreflang="eo" data-title="Ekstersunsistema planedo" 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-Q17437798 badge-goodarticle mw-list-item" title="god artikel"><a href="https://es.wikipedia.org/wiki/Planeta_extrasolar" title="Planeta extrasolar – spansk" lang="es" hreflang="es" data-title="Planeta extrasolar" data-language-autonym="Español" data-language-local-name="spansk" 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/Eksoplaneet" title="Eksoplaneet – estisk" lang="et" hreflang="et" data-title="Eksoplaneet" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Exoplaneta" title="Exoplaneta – baskisk" lang="eu" hreflang="eu" data-title="Exoplaneta" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Pranetas_essusolaris" title="Pranetas essusolaris – Extremaduran" lang="ext" hreflang="ext" data-title="Pranetas essusolaris" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%DB%8C%D8%A7%D8%B1%D9%87_%D9%81%D8%B1%D8%A7%D8%AE%D9%88%D8%B1%D8%B4%DB%8C%D8%AF%DB%8C" title="سیاره فراخورشیدی – persisk" lang="fa" hreflang="fa" data-title="سیاره فراخورشیدی" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi badge-Q17559452 badge-recommendedarticle mw-list-item" title="lovende artikel"><a href="https://fi.wikipedia.org/wiki/Eksoplaneetta" title="Eksoplaneetta – finsk" lang="fi" hreflang="fi" data-title="Eksoplaneetta" data-language-autonym="Suomi" data-language-local-name="finsk" 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/Exoplan%C3%A8te" title="Exoplanète – fransk" lang="fr" hreflang="fr" data-title="Exoplanète" data-language-autonym="Français" data-language-local-name="fransk" 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/Eiseaphl%C3%A1in%C3%A9ad" title="Eiseaphláinéad – irsk" lang="ga" hreflang="ga" data-title="Eiseaphláinéad" data-language-autonym="Gaeilge" data-language-local-name="irsk" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Planeta_extrasolar" title="Planeta extrasolar – galicisk" lang="gl" hreflang="gl" data-title="Planeta extrasolar" data-language-autonym="Galego" data-language-local-name="galicisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/Planaid_neughrianagh" title="Planaid neughrianagh – manx" lang="gv" hreflang="gv" data-title="Planaid neughrianagh" data-language-autonym="Gaelg" data-language-local-name="manx" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9B%D7%95%D7%9B%D7%91_%D7%9C%D7%9B%D7%AA_%D7%97%D7%95%D7%A5-%D7%A9%D7%9E%D7%A9%D7%99" title="כוכב לכת חוץ-שמשי – hebraisk" lang="he" hreflang="he" data-title="כוכב לכת חוץ-שמשי" data-language-autonym="עברית" data-language-local-name="hebraisk" 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%AC%E0%A4%B9%E0%A4%BF%E0%A4%B0%E0%A5%8D%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9" title="बहिर्ग्रह – hindi" lang="hi" hreflang="hi" data-title="बहिर्ग्रह" 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/Ekstrasolarni_planeti" title="Ekstrasolarni planeti – kroatisk" lang="hr" hreflang="hr" data-title="Ekstrasolarni planeti" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://hu.wikipedia.org/wiki/Exobolyg%C3%B3" title="Exobolygó – ungarsk" lang="hu" hreflang="hu" data-title="Exobolygó" data-language-autonym="Magyar" data-language-local-name="ungarsk" 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/%D4%B7%D5%AF%D5%A6%D5%B8%D5%B4%D5%B8%D5%AC%D5%B8%D6%80%D5%A1%D5%AF" title="Էկզոմոլորակ – armensk" lang="hy" hreflang="hy" data-title="Էկզոմոլորակ" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Exoplaneta" title="Exoplaneta – interlingua" lang="ia" hreflang="ia" data-title="Exoplaneta" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Planet_luar_surya" title="Planet luar surya – indonesisk" lang="id" hreflang="id" data-title="Planet luar surya" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/Mbara_ala_%E1%BB%8Dz%E1%BB%8D" title="Mbara ala ọzọ – igbo" lang="ig" hreflang="ig" data-title="Mbara ala ọzọ" data-language-autonym="Igbo" data-language-local-name="igbo" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Exoplaneto" title="Exoplaneto – ido" lang="io" hreflang="io" data-title="Exoplaneto" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Fjarreikistjarna" title="Fjarreikistjarna – islandsk" lang="is" hreflang="is" data-title="Fjarreikistjarna" data-language-autonym="Íslenska" data-language-local-name="islandsk" 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/Pianeta_extrasolare" title="Pianeta extrasolare – italiensk" lang="it" hreflang="it" data-title="Pianeta extrasolare" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja badge-Q17437798 badge-goodarticle mw-list-item" title="god artikel"><a href="https://ja.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E7%B3%BB%E5%A4%96%E6%83%91%E6%98%9F" title="太陽系外惑星 – japansk" lang="ja" hreflang="ja" data-title="太陽系外惑星" data-language-autonym="日本語" data-language-local-name="japansk" 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/Planit_jaban_surya" title="Planit jaban surya – javanesisk" lang="jv" hreflang="jv" data-title="Planit jaban surya" data-language-autonym="Jawa" data-language-local-name="javanesisk" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://ka.wikipedia.org/wiki/%E1%83%94%E1%83%92%E1%83%96%E1%83%9D%E1%83%9E%E1%83%9A%E1%83%90%E1%83%9C%E1%83%94%E1%83%A2%E1%83%90" title="ეგზოპლანეტა – georgisk" lang="ka" hreflang="ka" data-title="ეგზოპლანეტა" data-language-autonym="ქართული" data-language-local-name="georgisk" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Amtiweg_uffi%C9%A3" title="Amtiweg uffiɣ – kabylsk" lang="kab" hreflang="kab" data-title="Amtiweg uffiɣ" data-language-autonym="Taqbaylit" data-language-local-name="kabylsk" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Экзопланета – kasakhisk" lang="kk" hreflang="kk" data-title="Экзопланета" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%B8%E0%B3%8C%E0%B2%B0%E0%B2%BE%E0%B2%A4%E0%B3%80%E0%B2%A4_%E0%B2%97%E0%B3%8D%E0%B2%B0%E0%B2%B9" title="ಸೌರಾತೀತ ಗ್ರಹ – kannada" lang="kn" hreflang="kn" data-title="ಸೌರಾತೀತ ಗ್ರಹ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko badge-Q17437798 badge-goodarticle mw-list-item" title="god artikel"><a href="https://ko.wikipedia.org/wiki/%EC%99%B8%EA%B3%84_%ED%96%89%EC%84%B1" title="외계 행성 – koreansk" lang="ko" hreflang="ko" data-title="외계 행성" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-kv mw-list-item"><a href="https://kv.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82" title="Экзопланет – komi" lang="kv" hreflang="kv" data-title="Экзопланет" data-language-autonym="Коми" data-language-local-name="komi" class="interlanguage-link-target"><span>Коми</span></a></li><li class="interlanguage-link interwiki-la badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://la.wikipedia.org/wiki/Planeta_extrasolaris" title="Planeta extrasolaris – latin" lang="la" hreflang="la" data-title="Planeta extrasolaris" data-language-autonym="Latina" data-language-local-name="latin" 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/Exoplan%C3%A9it" title="Exoplanéit – luxembourgsk" lang="lb" hreflang="lb" data-title="Exoplanéit" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Planetas_estrasolal" title="Planetas estrasolal – Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Planetas estrasolal" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Exoplaneet" title="Exoplaneet – limburgsk" lang="li" hreflang="li" data-title="Exoplaneet" data-language-autonym="Limburgs" data-language-local-name="limburgsk" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Egzoplaneta" title="Egzoplaneta – litauisk" lang="lt" hreflang="lt" data-title="Egzoplaneta" data-language-autonym="Lietuvių" data-language-local-name="litauisk" 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/Citplan%C4%93ta" title="Citplanēta – lettisk" lang="lv" hreflang="lv" data-title="Citplanēta" data-language-autonym="Latviešu" data-language-local-name="lettisk" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%92%D0%BE%D0%BD%D1%81%D0%BE%D0%BD%D1%87%D0%B5%D0%B2%D0%B0_%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Вонсончева планета – makedonsk" lang="mk" hreflang="mk" data-title="Вонсончева планета" data-language-autonym="Македонски" data-language-local-name="makedonsk" 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%B8%E0%B5%97%E0%B4%B0%E0%B4%AF%E0%B5%82%E0%B4%A5%E0%B5%87%E0%B4%A4%E0%B4%B0%E0%B4%97%E0%B5%8D%E0%B4%B0%E0%B4%B9%E0%B4%82" title="സൗരയൂഥേതരഗ്രഹം – malayalam" lang="ml" hreflang="ml" data-title="സൗരയൂഥേതരഗ്രഹം" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82" title="Экзопланет – mongolsk" lang="mn" hreflang="mn" data-title="Экзопланет" data-language-autonym="Монгол" data-language-local-name="mongolsk" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%B9" title="परग्रह – marathisk" lang="mr" hreflang="mr" data-title="परग्रह" data-language-autonym="मराठी" data-language-local-name="marathisk" 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/Planet_luar_suria" title="Planet luar suria – malajisk" lang="ms" hreflang="ms" data-title="Planet luar suria" data-language-autonym="Bahasa Melayu" data-language-local-name="malajisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%94%E1%80%B1%E1%80%85%E1%80%80%E1%80%BC%E1%80%9D%E1%80%A0%E1%80%AC%E1%80%95%E1%80%BC%E1%80%84%E1%80%BA%E1%80%95%E1%80%82%E1%80%BC%E1%80%AD%E1%80%AF%E1%80%9F%E1%80%BA" title="နေစကြဝဠာပြင်ပဂြိုဟ် – burmesisk" lang="my" hreflang="my" data-title="နေစကြဝဠာပြင်ပဂြိုဟ်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="burmesisk" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Exoplaneet" title="Exoplaneet – nederlandsk" lang="nl" hreflang="nl" data-title="Exoplaneet" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" 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/Ekstrasolar_planet" title="Ekstrasolar planet – nynorsk" lang="nn" hreflang="nn" data-title="Ekstrasolar planet" data-language-autonym="Norsk nynorsk" data-language-local-name="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/Eksoplanet" title="Eksoplanet – bokmål" lang="nb" hreflang="nb" data-title="Eksoplanet" data-language-autonym="Norsk bokmål" data-language-local-name="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/Exoplaneta" title="Exoplaneta – occitansk" lang="oc" hreflang="oc" data-title="Exoplaneta" data-language-autonym="Occitan" data-language-local-name="occitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Lafjoo_Sirna_biiftuun_Alaa" title="Lafjoo Sirna biiftuun Alaa – oromo" lang="om" hreflang="om" data-title="Lafjoo Sirna biiftuun Alaa" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%97%E0%A8%BC%E0%A9%88%E0%A8%B0-%E0%A8%B8%E0%A9%82%E0%A8%B0%E0%A8%9C%E0%A9%80_%E0%A8%97%E0%A9%8D%E0%A8%B0%E0%A8%B9%E0%A8%BF" title="ਗ਼ੈਰ-ਸੂਰਜੀ ਗ੍ਰਹਿ – punjabisk" lang="pa" hreflang="pa" data-title="ਗ਼ੈਰ-ਸੂਰਜੀ ਗ੍ਰਹਿ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabisk" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Planeta_pozas%C5%82oneczna" title="Planeta pozasłoneczna – polsk" lang="pl" hreflang="pl" data-title="Planeta pozasłoneczna" data-language-autonym="Polski" data-language-local-name="polsk" 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%B3%D9%88%D8%B1%D8%AC%D9%88%DA%BA_%D9%BE%D8%B1%DB%92_%D9%BE%D8%A7%D9%86%D8%AF%DA%BE%DB%8C" title="سورجوں پرے پاندھی – Western Punjabi" lang="pnb" hreflang="pnb" data-title="سورجوں پرے پاندھی" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D9%84%D9%87_%D9%84%D9%85%D8%B1%DB%8C%D8%B2_%D9%86%D8%B8%D8%A7%D9%85_%D8%A8%D9%87%D8%B1_%D8%B3%DB%8C%D8%A7%D8%B1%D9%87" title="له لمریز نظام بهر سیاره – pashto" lang="ps" hreflang="ps" data-title="له لمریز نظام بهر سیاره" data-language-autonym="پښتو" data-language-local-name="pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Exoplaneta" title="Exoplaneta – portugisisk" lang="pt" hreflang="pt" data-title="Exoplaneta" data-language-autonym="Português" data-language-local-name="portugisisk" 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/Exoplanet%C4%83" title="Exoplanetă – rumænsk" lang="ro" hreflang="ro" data-title="Exoplanetă" data-language-autonym="Română" data-language-local-name="rumænsk" 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%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Экзопланета – russisk" lang="ru" hreflang="ru" data-title="Экзопланета" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-scn badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://scn.wikipedia.org/wiki/Pianeta_extrasulari" title="Pianeta extrasulari – siciliansk" lang="scn" hreflang="scn" data-title="Pianeta extrasulari" data-language-autonym="Sicilianu" data-language-local-name="siciliansk" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Ekstrasolarni_planet" title="Ekstrasolarni planet – serbokroatisk" lang="sh" hreflang="sh" data-title="Ekstrasolarni planet" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%B6%E0%B7%84%E0%B7%92%E0%B7%82%E0%B7%8A-%E0%B7%83%E0%B7%9E%E0%B6%BB_%E0%B6%9C%E0%B7%8A%E2%80%8D%E0%B6%BB%E0%B7%84%E0%B6%BD%E0%B7%9D%E0%B6%9A" title="බහිෂ්-සෞර ග්‍රහලෝක – singalesisk" lang="si" hreflang="si" data-title="බහිෂ්-සෞර ග්‍රහලෝක" data-language-autonym="සිංහල" data-language-local-name="singalesisk" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Extrasolar_planet" title="Extrasolar planet – Simple English" lang="en-simple" hreflang="en-simple" data-title="Extrasolar planet" 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/Extrasol%C3%A1rna_plan%C3%A9ta" title="Extrasolárna planéta – slovakisk" lang="sk" hreflang="sk" data-title="Extrasolárna planéta" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" 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/Zunajoson%C4%8Dni_planet" title="Zunajosončni planet – slovensk" lang="sl" hreflang="sl" data-title="Zunajosončni planet" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Ekzoplaneti" title="Ekzoplaneti – albansk" lang="sq" hreflang="sq" data-title="Ekzoplaneti" data-language-autonym="Shqip" data-language-local-name="albansk" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%95%D0%BA%D1%81%D1%82%D1%80%D0%B0%D1%81%D0%BE%D0%BB%D0%B0%D1%80%D0%BD%D0%B5_%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B5" title="Екстрасоларне планете – serbisk" lang="sr" hreflang="sr" data-title="Екстрасоларне планете" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv badge-Q17559452 badge-recommendedarticle mw-list-item" title="lovende artikel"><a href="https://sv.wikipedia.org/wiki/Exoplanet" title="Exoplanet – svensk" lang="sv" hreflang="sv" data-title="Exoplanet" data-language-autonym="Svenska" data-language-local-name="svensk" 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/Sayari-nje" title="Sayari-nje – swahili" lang="sw" hreflang="sw" data-title="Sayari-nje" data-language-autonym="Kiswahili" data-language-local-name="swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AA%E0%AF%81%E0%AE%B1%E0%AE%95%E0%AF%8D%E0%AE%95%E0%AF%8B%E0%AE%B3%E0%AF%8D" title="புறக்கோள் – tamil" lang="ta" hreflang="ta" data-title="புறக்கோள்" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%AD%D0%BA%D0%B7%D0%BE%D1%81%D0%B0%D0%B9%D1%91%D1%80%D0%B0" title="Экзосайёра – tadsjikisk" lang="tg" hreflang="tg" data-title="Экзосайёра" data-language-autonym="Тоҷикӣ" data-language-local-name="tadsjikisk" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-th badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://th.wikipedia.org/wiki/%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B9%80%E0%B8%84%E0%B8%A3%E0%B8%B2%E0%B8%B0%E0%B8%AB%E0%B9%8C%E0%B8%99%E0%B8%AD%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A" title="ดาวเคราะห์นอกระบบ – thai" lang="th" hreflang="th" data-title="ดาวเคราะห์นอกระบบ" data-language-autonym="ไทย" data-language-local-name="thai" 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/Eksoplaneta" title="Eksoplaneta – tagalog" lang="tl" hreflang="tl" data-title="Eksoplaneta" data-language-autonym="Tagalog" data-language-local-name="tagalog" 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/%C3%96tegezegen" title="Ötegezegen – tyrkisk" lang="tr" hreflang="tr" data-title="Ötegezegen" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" 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%AD%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Экзопланета – tatarisk" lang="tt" hreflang="tt" data-title="Экзопланета" data-language-autonym="Татарча / tatarça" data-language-local-name="tatarisk" 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%95%D0%BA%D0%B7%D0%BE%D0%BF%D0%BB%D0%B0%D0%BD%D0%B5%D1%82%D0%B0" title="Екзопланета – ukrainsk" lang="uk" hreflang="uk" data-title="Екзопланета" data-language-autonym="Українська" data-language-local-name="ukrainsk" 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%A8%DB%8C%D8%B1%D9%88%D9%86%DB%8C_%D8%B3%DB%8C%D8%A7%D8%B1%DB%81" title="بیرونی سیارہ – urdu" lang="ur" hreflang="ur" data-title="بیرونی سیارہ" data-language-autonym="اردو" data-language-local-name="urdu" 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/Ekzosayyora" title="Ekzosayyora – usbekisk" lang="uz" hreflang="uz" data-title="Ekzosayyora" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" 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/Pianeta_extraso%C5%82are" title="Pianeta extrasołare – Venetian" lang="vec" hreflang="vec" data-title="Pianeta extrasołare" 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/H%C3%A0nh_tinh_ngo%C3%A0i_H%E1%BB%87_M%E1%BA%B7t_Tr%E1%BB%9Di" title="Hành tinh ngoài Hệ Mặt Trời – vietnamesisk" lang="vi" hreflang="vi" data-title="Hành tinh ngoài Hệ Mặt Trời" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" 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/Planeta_extrasolar" title="Planeta extrasolar – waray" lang="war" hreflang="war" data-title="Planeta extrasolar" data-language-autonym="Winaray" data-language-local-name="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%A4%AA%E9%98%B3%E7%B3%BB%E5%A4%96%E8%A1%8C%E6%98%9F" title="太阳系外行星 – wu-kinesisk" lang="wuu" hreflang="wuu" data-title="太阳系外行星" data-language-autonym="吴语" data-language-local-name="wu-kinesisk" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E7%B3%BB%E5%A4%96%E8%A1%8C%E6%98%9F" title="太陽系外行星 – kinesisk" lang="zh" hreflang="zh" data-title="太陽系外行星" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%A4%AA%E9%99%BD%E7%B3%BB%E5%A4%96%E8%A1%8C%E6%98%9F" title="太陽系外行星 – kantonesisk" lang="yue" hreflang="yue" data-title="太陽系外行星" data-language-autonym="粵語" data-language-local-name="kantonesisk" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-zu mw-list-item"><a href="https://zu.wikipedia.org/wiki/Umzulendle" title="Umzulendle – zulu" lang="zu" hreflang="zu" data-title="Umzulendle" data-language-autonym="IsiZulu" data-language-local-name="zulu" class="interlanguage-link-target"><span>IsiZulu</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q44559#sitelinks-wikipedia" title="Redigér sproglinks" class="wbc-editpage">Redigér links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Navnerum"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Exoplanet" title="Se indholdssiden [c]" accesskey="c"><span>Artikel</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Diskussion:Exoplanet" rel="discussion" title="Diskussion om indholdet på siden [t]" accesskey="t"><span>Diskussion</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Ændr sprogvariant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">dansk</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> 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data-event-name="pinnable-header.vector-appearance.unpin">skjul</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Fra Wikipedia, den frie encyklopædi</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="da" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/220px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/330px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/440px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg 2x" data-file-width="4000" data-file-height="3000" /></a><figcaption>Kunstners forestilling af planeten <a href="/wiki/OGLE-2005-BLG-390Lb" title="OGLE-2005-BLG-390Lb">OGLE-2005-BLG-390Lb</a>, som kredser om dets stjerne 20.000 <a href="/wiki/Lys%C3%A5r" title="Lysår">lysår</a> fra <a href="/wiki/Jorden" title="Jorden">Jorden</a>.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Exoplanet_Discovery_Methods_Bar.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Exoplanet_Discovery_Methods_Bar.png/220px-Exoplanet_Discovery_Methods_Bar.png" decoding="async" width="220" height="131" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Exoplanet_Discovery_Methods_Bar.png/330px-Exoplanet_Discovery_Methods_Bar.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Exoplanet_Discovery_Methods_Bar.png/440px-Exoplanet_Discovery_Methods_Bar.png 2x" data-file-width="8040" data-file-height="4800" /></a><figcaption>Diagram for antal og påvisningsmetoder af exoplaneter pr. år (23. september 2014) <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#0000CD; color:#0000CD;">    </span> Radialhastighed</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#8B008B; color:#8B008B;">    </span> Pulsarfrekvens</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#00aa00; color:#00aa00;">    </span> Transitmetode</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#aa0000; color:#aa0000;">    </span> Direkte observerede</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#8B6914; color:#8B6914;">    </span> Astrometrisk</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#551A8B; color:#551A8B;">    </span> Timing variationer</span> <span style="margin:0px; font-size:90%; display:block;"><span style="border:none; background-color:#8B4500; color:#8B4500;">    </span> Gravitationel mikrolinsning</span> </figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg/220px-NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg" decoding="async" width="220" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg/330px-NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg/440px-NASA%27s_Hubble_Reveals_Rogue_Planetary_Orbit_For_Fomalhaut_B.jpg 2x" data-file-width="1000" data-file-height="812" /></a><figcaption>Formalhaut b var den første exoplanet der kunne observeres direkte</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:HR_8799_Orbiting_Exoplanets.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/HR_8799_Orbiting_Exoplanets.gif/220px-HR_8799_Orbiting_Exoplanets.gif" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/HR_8799_Orbiting_Exoplanets.gif/330px-HR_8799_Orbiting_Exoplanets.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/HR_8799_Orbiting_Exoplanets.gif/440px-HR_8799_Orbiting_Exoplanets.gif 2x" data-file-width="850" data-file-height="850" /></a><figcaption>HR 8799 med fire exoplaneter observeret direkte</figcaption></figure> <p>En <b>exoplanet</b>, <b>eksoplanet</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> eller <b>ekstrasolar planet</b> er en <a href="/wiki/Planet" title="Planet">planet</a>, der kredser om en anden <a href="/wiki/Stjerne" title="Stjerne">stjerne</a> end <a href="/wiki/Solen" title="Solen">Solen</a>. Igennem flere århundreder har mennesker spekuleret på om, og i givet fald hvor mange, sådanne planeter der findes, men først i <a href="/wiki/1990%27erne" title="1990'erne">1990'erne</a> var observationsteknikken tilstrækkelig forfinet til at man kunne påvise exoplaneter. Til gengæld er det sidenhen gået stærkt; siden <a href="/wiki/2002" title="2002">2002</a> er der gjort 20 nye opdagelser om året og flere gange højere de sidste par år, og pr. 4. april <a href="/wiki/2014" title="2014">2014</a> kender man til 1780 exoplaneter.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Astronomer kender i øjeblikket over 5000 exoplaneter, der på nuværende tidspunkt kræver en dybere analyse før de kan blive publiceret. </p><p>Beregninger tyder på at mindst 10% af de stjerner, der ligner Solen, har en eller flere planeter, men det tal kan meget vel vise sig at være større. Langt størstedelen af de fundne planeter har vist sig at være meget større end Jorden og ligge uden for <a href="/wiki/Den_beboelige_zone" title="Den beboelige zone">den beboelige zone</a>. Den største interesse samler sig om de få Jord-lignende exoplaneter i <a href="/wiki/Den_beboelige_zone" title="Den beboelige zone">den beboelige zone</a>, hvor der kunne findes flydende vand.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> I 2016 blev der fundet en Jord-lignende planet, <a href="/wiki/Proxima_b" class="mw-redirect" title="Proxima b">Proxima b</a>, i kredsløb om vores nærmeste nabo-stjerne, kun 4,25 lysår borte.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Historie">Historie</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=1" title="Redigér afsnit: Historie" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=1" title="Edit section's source code: Historie"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I adskillige århundreder har man spekuleret på om der findes planeter andre steder end i vores eget <a href="/wiki/Solsystem" class="mw-redirect" title="Solsystem">Solsystem</a>, og ledt efter dem. Da man ikke kunne se nogen, opstod tanken om at vores Solsystem måske er enten helt unikt, eller et ekstremt sjældent fænomen. </p> <div class="mw-heading mw-heading3"><h3 id="Fejlagtige_rapporter">Fejlagtige rapporter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=2" title="Redigér afsnit: Fejlagtige rapporter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=2" title="Edit section's source code: Fejlagtige rapporter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Talrige gange de sidste 150 år har folk hævdet at have fundet en exoplanet: I <a href="/wiki/1855" title="1855">1855</a> skrev kaptajn W. S. Jacob ved <a href="/wiki/Det_britiske_ostindiske_kompagni" class="mw-redirect" title="Det britiske ostindiske kompagni">Det britiske ostindiske kompagnis</a> observatorium i <a href="/wiki/Chennai" title="Chennai">Madras</a>, at nogle "ujævnheder" i <a href="/wiki/Dobbeltstjerne" title="Dobbeltstjerne">dobbeltstjernen</a> <a href="/w/index.php?title=70_Ophiuchi&action=edit&redlink=1" class="new" title="70 Ophiuchi (ikke skrevet endnu)">70 Ophiuchi</a>'s bevægelser højst sandsynligt skyldtes en hidtil uset planet i kredsløb om en af dobbeltstjerne-systemets "medlemmer". I <a href="/wiki/1890%27erne" title="1890'erne">1890'erne</a> beregnede <a href="/w/index.php?title=Thomas_J._J._See&action=edit&redlink=1" class="new" title="Thomas J. J. See (ikke skrevet endnu)">Thomas J. J. See</a> fra <a href="/wiki/University_of_Chicago" title="University of Chicago">University of Chicago</a> sammen med den amerikanske flådes observatorium, at "ujævnhederne" stemte overens med en planet der kredsede én gang om en af stjernerne hvert 36. år. Desværre påviste <a href="/w/index.php?title=Forest_Ray_Moulton&action=edit&redlink=1" class="new" title="Forest Ray Moulton (ikke skrevet endnu)">Forest Ray Moulton</a> kort tid derefter, at den foreslåede <a href="/wiki/Oml%C3%B8bsbane" title="Omløbsbane">omløbsbane</a> ville være højst ustabil, og derfor temmelig usandsynlig. </p><p>Op igennem <a href="/wiki/1950%27erne" title="1950'erne">1950'erne</a> og <a href="/wiki/1960%27erne" title="1960'erne">1960'erne</a> hævdede <a href="/w/index.php?title=Peter_van_de_Kamp&action=edit&redlink=1" class="new" title="Peter van de Kamp (ikke skrevet endnu)">Peter van de Kamp</a> ved flere lejligheder at have påvist en exoplanet, denne gang vedrørende <a href="/wiki/Barnards_stjerne" title="Barnards stjerne">Barnards stjerne</a>. Astronomer betragter generelt alle disse samt tidligere rapporter om exoplaneter som "falske alarmer". </p> <div class="mw-heading mw-heading3"><h3 id="Den_første_bekræftede_exoplanet"><span id="Den_f.C3.B8rste_bekr.C3.A6ftede_exoplanet"></span>Den første bekræftede exoplanet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=3" title="Redigér afsnit: Den første bekræftede exoplanet" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=3" title="Edit section's source code: Den første bekræftede exoplanet"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Den første offentliggjorte opdagelse af en exoplanet som siden er bekræftet, blev gjort i <a href="/wiki/1988" title="1988">1988</a> af de <a href="/wiki/Canada" title="Canada">canadiske</a> astronomer Bruce Campbell, G. A. H. Walker og S. Yang: Deres målinger af <a href="/w/index.php?title=Radialhastighed&action=edit&redlink=1" class="new" title="Radialhastighed (ikke skrevet endnu)">radialhastigheder</a> tydede på at en planet kredser om stjernen Gamma Cephei, også kendt som <a href="/w/index.php?title=Alrai&action=edit&redlink=1" class="new" title="Alrai (ikke skrevet endnu)">Alrai</a>. De var forsigtige med direkte at påstå at der findes en planet, og i astronom-kredse herskede der i en årrække en del skepsis omkring denne og andre observationer der også tydede på mulige planeter — især fordi målingerne var på kanten af hvad der var muligt med den tids observationsteknologi — eksempelvis var det svært at skelne mellem en meget stor planet og en <a href="/wiki/Brun_dv%C3%A6rg" title="Brun dværg">brun dværgstjerne</a> på den afstand.<br /> Året efter blev der foretaget flere observationer af Gamma Cephei, som synes at bekræfte planet-teorien. I <a href="/wiki/1992" title="1992">1992</a> blev der til gengæld sået tvivl om tolkningen af observationerne. Endelig, i <a href="/wiki/2003" title="2003">2003</a>, var observationsteknologien forfinet tilstrækkelig til, at man kunne bekræfte denne planets eksistens. </p> <div class="mw-heading mw-heading3"><h3 id="Pulsarplaneter">Pulsarplaneter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=4" title="Redigér afsnit: Pulsarplaneter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=4" title="Edit section's source code: Pulsarplaneter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I <a href="/wiki/1991" title="1991">1991</a> mente <a href="/w/index.php?title=Andrew_Lyne&action=edit&redlink=1" class="new" title="Andrew Lyne (ikke skrevet endnu)">Andrew Lyne</a>, M. Bailes og S.L. Shemar at have fundet en exoplanet omkring <a href="/wiki/Pulsar" title="Pulsar">pulsaren</a> <a href="/w/index.php?title=PSR_1829-10&action=edit&redlink=1" class="new" title="PSR 1829-10 (ikke skrevet endnu)">PSR 1829-10</a>, ud fra målinger af små variationer i de ellers uhyre <a href="/wiki/Frekvens" title="Frekvens">frekvens</a>-stabile radiopulser som pulsaren udsender: De tiltrak sig stor opmærksomhed, men trak deres rapport tilbage kort efter. </p><p>I begyndelsen af 1992 rapporterede den <a href="/wiki/Polen" title="Polen">polske</a> astronom <a href="/wiki/Aleksander_Wolszczan" title="Aleksander Wolszczan">Aleksander Wolszczan</a> at han havde fundet en anden pulsar; <a href="/w/index.php?title=PSR_1257%2B12&action=edit&redlink=1" class="new" title="PSR 1257+12 (ikke skrevet endnu)">PSR 1257+12</a>. Denne gang blev opdagelsen hurtigt bekræftet, og regnes i dag for at være den exoplanet der først opnåede den endelige bekræftelse.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Pulsarer er resterne af en <a href="/wiki/Supernova" title="Supernova">supernovaeksplosion</a>, så disse såkaldte <a href="/w/index.php?title=Pulsarplanet&action=edit&redlink=1" class="new" title="Pulsarplanet (ikke skrevet endnu)">pulsarplaneter</a> er enten hvad der er tilbage af det planetsystem stjernen havde inden den eksploderede, eller også er de "nye" planeter, dannet af det stof som stjernen slyngede ud i rummet ved sin eksplosion. </p> <div class="mw-heading mw-heading3"><h3 id="Planeter_omkring_hovedseriestjerner">Planeter omkring hovedseriestjerner</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=5" title="Redigér afsnit: Planeter omkring hovedseriestjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=5" title="Edit section's source code: Planeter omkring hovedseriestjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Den <a href="/wiki/6._oktober" title="6. oktober">6. oktober</a> <a href="/wiki/1995" title="1995">1995</a> opdagede <a href="/wiki/Michel_Mayor" title="Michel Mayor">Michel Mayor</a> og <a href="/wiki/Didier_Queloz" title="Didier Queloz">Didier Queloz</a> fra universitetet i <a href="/wiki/Geneve" class="mw-redirect" title="Geneve">Geneve</a> for første gang en exoplanet der kredser omkring en <a href="/w/index.php?title=Hovedserie&action=edit&redlink=1" class="new" title="Hovedserie (ikke skrevet endnu)">hovedseriestjerne</a>; <a href="/w/index.php?title=51_Pegasi&action=edit&redlink=1" class="new" title="51 Pegasi (ikke skrevet endnu)">51 Pegasi</a>. Dette indledte en ny "tidsalder" i jagten på exoplaneter: Nye landvindinger indenfor især <a href="/wiki/Spektroskopi" title="Spektroskopi">spektroskopi</a> gjorde at man nu opdagede mange nye exoplaneter i et hastigt tempo. Nu kunne man "spore" planeter ved at iagttage deres <a href="/wiki/Tyngdekraft" class="mw-redirect" title="Tyngdekraft">tyngdekrafts</a> indvirkning på <a href="/wiki/Lys" title="Lys">lyset</a>, og afsløre dem når de passerede imellem deres stjerne og Jorden. </p> <div class="mw-heading mw-heading2"><h2 id="Påvisning_af_exoplaneter"><span id="P.C3.A5visning_af_exoplaneter"></span>Påvisning af exoplaneter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=6" title="Redigér afsnit: Påvisning af exoplaneter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=6" title="Edit section's source code: Påvisning af exoplaneter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Orbit3.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/5/59/Orbit3.gif" decoding="async" width="200" height="200" class="mw-file-element" data-file-width="200" data-file-height="200" /></a><figcaption>Hvis en stjerne (stor cirkel) omkredses af en planet (lille cirkel), vil begge parter cirkle om et fælles tyngdepunt (rødt kryds). Selv om man ikke direkte kan se planeten, "afsløres" den alligevel af stjernens cirkelformede bevægelser.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:CoRoT-1.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/34/CoRoT-1.jpg/220px-CoRoT-1.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/34/CoRoT-1.jpg/330px-CoRoT-1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/34/CoRoT-1.jpg/440px-CoRoT-1.jpg 2x" data-file-width="4000" data-file-height="3000" /></a><figcaption>En tegning der viser en planetpassage eller planettransit.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Planetary_transit.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Planetary_transit.svg/220px-Planetary_transit.svg.png" decoding="async" width="220" height="69" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Planetary_transit.svg/330px-Planetary_transit.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Planetary_transit.svg/440px-Planetary_transit.svg.png 2x" data-file-width="1134" data-file-height="354" /></a><figcaption>Planetpassage og ændringen af lysintensiteten</figcaption></figure> <p>Enhver planet er en yderst svag lyskilde sammenlignet med den stjerne den kredser om, så derfor er astronomerne nødt til at ty til indirekte måder at påvise en exoplanet på. Det er lykkedes at "se" (fotografere) en exoplanet direkte, men der ud over har seks andre og mere indirekte metoder "givet bid": </p> <ul><li><b>Direkte observation</b>, se for eksempel de fire planeter om HR 8799.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li> <li><b><a href="/wiki/Astrometri" title="Astrometri">Astrometri</a></b>, som består i at måle stjernens nøjagtige position gentagne gange: Hvis en tung planet kredser tæt omkring stjernen, vil den lave nogle bittesmå <a href="/wiki/Cirkel" title="Cirkel">cirkel</a>- eller <a href="/wiki/Ellipse" class="mw-redirect" title="Ellipse">ellipseformede</a> bevægelser.</li> <li><b><a href="/w/index.php?title=Radialhastighed&action=edit&redlink=1" class="new" title="Radialhastighed (ikke skrevet endnu)">Radialhastigheden</a></b> for en stjerne — den <a href="/wiki/Fart" title="Fart">fart</a> hvormed stjernen enten nærmer eller fjerner sig i forhold til en observatør på Jorden — kan måles ud fra <a href="/wiki/Dopplereffekt" title="Dopplereffekt">dopplereffekten</a>: Her søger også man efter de karakteristiske cirkel- eller ellipsebevægelser. Indtil 2014 var det denne metode, der havde opdaget flest exoplaneter.</li> <li><b><a href="/wiki/Pulsar" title="Pulsar">Pulsarer</a></b> udsender <a href="/wiki/Radiosignal" class="mw-redirect" title="Radiosignal">radiosignaler</a> med uhyre regelmæssige mellemrum, så ved at måle eventuelle variationer i disse signaler kan man ligesom med radialhastigheden "afsløre" eventuelle exoplaneter ved hjælp af dopplereffekten.</li> <li><b><a href="/wiki/Planetpassage" class="mw-redirect" title="Planetpassage">Planetpassage</a></b> eller <b>planettransit</b> dvs. når planeten passerer direkte imellem sin egen stjerne og en observatør på Jorden, medfører at man fra Jorden ser en lille smule mindre lys end normalt fra stjernen, i den tid planeten "formørker" stjernen. <a href="/wiki/Kepler-rumteleskopet" title="Kepler-rumteleskopet">Kepler-rumteleskopet</a> undersøgte i perioden 2009-18 lysstyrken 500.000 stjerner, og fandt 2.681 bekræftede exoplaneter samt yderligere 2.900 potentielle eksoplaneter, der pr. november 2018 endnu ikke var næremre undersøgt og bekræftet.<sup id="cite_ref-space_9-0" class="reference"><a href="#cite_note-space-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Kepler-rumteleskopet har opdaget ca. 70% af alle kendte exoplaneter.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-space_9-1" class="reference"><a href="#cite_note-space-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Gravitationslinseeffekt" title="Gravitationslinseeffekt"><b>Gravitationelle mikrolinser</b></a> er lysbrydninger der skyldes tilstedeværelsen af tyngdekraft. Stjerner danner disse "linseeffekter", men en eventuel planet omkring stjernen bidrager også til denne effekt, og det kan måles.</li> <li><b>Skiver af støv</b>, som findes omkring en række stjerner, kan påvises gennem <a href="/wiki/Infrar%C3%B8d" class="mw-redirect" title="Infrarød">infrarøde</a> observationer, fordi stjernen i midten opvarmer partiklerne i støvet og derved får dem til at "lyse infrarødt". Observationer viser at der findes planetstore objekter til stede i disse støvskiver.</li></ul> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/Fil:Extrasolar_Planets_2004-08-31.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Extrasolar_Planets_2004-08-31.png/220px-Extrasolar_Planets_2004-08-31.png" decoding="async" width="220" height="344" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Extrasolar_Planets_2004-08-31.png/330px-Extrasolar_Planets_2004-08-31.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/de/Extrasolar_Planets_2004-08-31.png/440px-Extrasolar_Planets_2004-08-31.png 2x" data-file-width="1382" data-file-height="2161" /></a><figcaption>På dette diagram er alle de exoplaneter man kendte den 31. august 2004 indtegnet som små pletter: Den vandrette skala angiver omløbsbanens størrelse, og den lodrette planetens egen størrelse. De lidt større pletter med bogstaver repræsenterer vort eget solsystems planeter. Stregerne viser grænserne for hvilke planeter der kan opdages med hvilke observationsmetoder.</figcaption></figure> <p>Adskillige rumflyvninger er planlagt, hvorunder man vil forsøge at anvende nogle af disse metoder fra rummet: Her undgår man den <a href="/wiki/Atmosf%C3%A6risk_luft" class="mw-redirect" title="Atmosfærisk luft">atmosfæriske lufts</a> forvrænging, og man kan observere de infrarøde bølgelænger som luften absorberer. Visse af disse fartøjer er i stand til at konstatere planeter på størrelse med <a href="/wiki/Jorden" title="Jorden">Jorden</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Betegnelser_for_planeter">Betegnelser for planeter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=7" title="Redigér afsnit: Betegnelser for planeter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=7" title="Edit section's source code: Betegnelser for planeter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De planeter man opdager omkring en stjerne tildeles alfabetets små bogstaver, startende med b; for eksempel <a href="/w/index.php?title=51_Pegasi_b&action=edit&redlink=1" class="new" title="51 Pegasi b (ikke skrevet endnu)">51 Pegasi b</a>, 51 Pegasi c, 51 Pegasi d osv., i den rækkefølge planeterne bliver opdaget. Bogstavet a bruges ikke, da det kan misforstås som en betegnelse for stjernen selv frem for den først opdagede af dens planeter. Før opdagelsen af 51 Pegasi b i 1995 brugte man store bogstaver, startede med A, og tildelte bogstaver i den rækkefølge planeterne var ordnet omkring stjernen, med den inderste som "A-planeten". </p> <div class="mw-heading mw-heading2"><h2 id="Exoplaneternes_generelle_træk"><span id="Exoplaneternes_generelle_tr.C3.A6k"></span>Exoplaneternes generelle træk</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=8" title="Redigér afsnit: Exoplaneternes generelle træk" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=8" title="Edit section's source code: Exoplaneternes generelle træk"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De fleste af de exoplaneter man har opdaget, kredser om stjerner der nogenlunde ligner vores sol; <a href="/w/index.php?title=Hovedserie&action=edit&redlink=1" class="new" title="Hovedserie (ikke skrevet endnu)">hovedseriestjerner</a> af <a href="/wiki/Spektralklasse" title="Spektralklasse">spektralklasse</a> F, G og K, først og fremmest fordi det primært er omkring disse stjerner man har søgt efter planeter. Men selv når man tager højde for det forhold, er der noget der tyder på at mindre/lettere stjerner enten sjældent har planeter, eller også er deres planeter meget små og derfor svære at opdage. Omvendt tyder nylige observationer foretager med <a href="/wiki/Spitzer-rumteleskopet" class="mw-redirect" title="Spitzer-rumteleskopet">Spitzer-rumteleskopet</a> på, at større, mere lysstærke stjerner når at "blæse" det stof der ellers ville være blevet til planeter, ud i rummet længe inden det kan "samle sig" i planeter. </p><p>Alle stjerner består overvejende af de lette <a href="/wiki/Grundstof" title="Grundstof">grundstoffer</a> <a href="/wiki/Brint" title="Brint">brint</a> og <a href="/wiki/Helium" title="Helium">helium</a>, men der ud over indeholder de også større eller mindre mængder af tungere grundstoffer, eller <a href="/wiki/Metallicitet_(astrofysik)" title="Metallicitet (astrofysik)">"metaller"</a> som astronomerne kalder dem. Stjerner med højt indhold af "metaller" er tilsyneladende mere tilbøjelige til at have planeter end stjerner med et lavere "metal"-indhold. </p><p>En analyse af 850 <a href="/wiki/Stjerne" title="Stjerne">stjerner</a> med <a href="/wiki/Planet" title="Planet">planeter</a> viser, at massive planeter af <a href="/wiki/Jupiter_(planet)" title="Jupiter (planet)">Jupiter</a>/<a href="/wiki/Saturn_(planet)" class="mw-redirect" title="Saturn (planet)">Saturn</a>-type næsten udelukkende er observeret i kredsløb omkring <a href="/wiki/Spektralklasse" title="Spektralklasse">spektralklasse</a> F, G og K med højere <a href="/wiki/Metallicitet_(astrofysik)" title="Metallicitet (astrofysik)">metallicitet</a> (målt som [Fe/H]) end <a href="/wiki/Solen" title="Solen">Solen</a> <sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>. </p><p>Af stjerner med en [Fe/H] metallicitet i forhold til Solens på ca. 0,3x(Sol) har kun ca. 3% af planeter, ved 1x(Sol) ca. 4-5%, ved 1,75 x(Sol) ca. 12%, ved 2,33x(Sol) ca. 17% og ved 3x(Sol) ca. 25%. </p><p>Langt de fleste af de exoplaneter man har fundet hidtil, er langt større og tungere end Jorden — 90 <a href="/wiki/Procent" title="Procent">procent</a> er mere end 10 gange tungere. Det skyldes først og fremmest at det i sagens natur er lettere at påvise en stor planet end en lille, og besværliggør en statistisk analyse. Alligevel er der tegn på at små planeter er mere udbredte end store — alene det faktum at det alle vanskeligheder til trods er lykkedes at finde adskillige planeter der blot er lidt større end Jorden, tyder på at mindre planeter må være en nogenlunde "almindelig" foreteelse. </p><p>Man formoder at langt de fleste kendte exoplaneter er store gas-kæmper ligesom <a href="/wiki/Jupiter_(planet)" title="Jupiter (planet)">Jupiter</a> i vores eget solsystem — dette er dog kun blevet bekræftet for planeter der "røbede sig" ved at passere ind foran deres "sol". Nogle få af de mindste exoplaneter formodes at være "faste" kloder, lavet af klippemateriale som vores egen Jord. </p><p>Mange exoplaneter kredser meget tættere om deres stjerne, end selv vort solsystems inderste planet, <a href="/wiki/Merkur_(planet)" title="Merkur (planet)">Merkur</a> gør omkring vores Sol — igen skyldes det at de anvendte observationsmetoder, især radialhastighedsmålingerne, har lettere ved at "se" en planet jo tættere den er på stjernen. Astronomerne var i første omgang forbavsede over at finde "<a href="/w/index.php?title=Varm_jupiter&action=edit&redlink=1" class="new" title="Varm jupiter (ikke skrevet endnu)">varme Jupiuter'e</a>"; Jupiterlignende planeter i snævre baner omkring deres stjerner, men det har senere vist sig, at langt de fleste exoplaneter i Jupiters "vægtklasse" har store omløbsbaner i stor afstand fra stjernen. </p><p>De fleste kendte exoplaneter har temmelig <a href="/wiki/Excentricitet_(matematik)" title="Excentricitet (matematik)">excentriske</a>, eller "langstrakte", omløbsbaner. Denne gang skyldes det ikke vores observationsmetoder — en planet i en cirkelformet bane er hverken lettere eller sværere at opdage end én i en langstrakt, elliptisk bane. Denne opdagelse har overrasket astronomerne; i vores eget solsystem, og i vore hidtidige teorier for et solsystems dannelse, følger planeterne noget nær cirkelformede baner. Én teori forklarer det med at såkaldte T-dværge (<a href="/wiki/Metan" title="Metan">metanholdige</a> dværgstjerner) der "gemmer sig" i et planetsystem, og med deres tyngdekraft "forstyrrer" planeterne så de får lange, elliptiske baner frem for cirkelrunde. En anden mulighed er, at vort solsystem blot er et "usædvanligt tilfælde" med dets udpræget cirkelformede omløbsbaner. </p><p><br /> Der er stadig utallige uafklarede spørgsmål vedrørende exoplaneterne: Hvad består de af? Har de <a href="/wiki/M%C3%A5ne" title="Måne">måner</a>, og i givet fald hvor mange? Og måske allermest interessant: Er der liv på dem? Mange planeter ligger i afstande fra deres "sole", der muliggør et klima nogenlunde som her på Jorden, men de er alle "kæmper" mere lig Jupiter end Jorden, så hvis disse planeter har måner, er disse måner formodentlig det mest oplagte sted at lede efter liv. Men selv om sådanne livsformer skulle være et udbredt fænomen, varer det mange år før vi er i stand til at påvise dem på interstellare afstande — undtagen hvis dette liv er avanceret nok til at sende radiosignaler. </p> <div class="mw-heading mw-heading2"><h2 id="Jordlignende_exoplaneter">Jordlignende exoplaneter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=9" title="Redigér afsnit: Jordlignende exoplaneter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=9" title="Edit section's source code: Jordlignende exoplaneter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Et meget interessant spørgsmål om en exoplanet er om den ligner Jorden, om den kan sammenlignes med Jorden med hensyn til en række parametre: </p> <ul><li>en sammenlignelig størrelse</li> <li>en sammenlignelig masse</li> <li>ligger den i den <a href="/wiki/Beboelige_zone" class="mw-redirect" title="Beboelige zone">beboelige zone</a></li></ul> <p>Vigtige parametre, som er mere vanskelige at afklare, er: </p> <ul><li>tilstedeværelsen af flydende vand, er det en <a href="/wiki/Vandverden" title="Vandverden">vandverden</a></li> <li>tilstedeværelsen af en <a href="/wiki/Atmosf%C3%A6re_(himmellegeme)" title="Atmosfære (himmellegeme)">atmosfære</a></li></ul> <p>Kun et fåtal af de fundne exoplaneter er sammenlignelige med Jorden. </p><p>Astronomerne er på jagt efter jordlignende exoplaneter om de nærmeste stjerner, og de har været heldige: </p> <ul><li>Proxima Centauri b i en afstand af 4,24 <a href="/wiki/Lys%C3%A5r" title="Lysår">lysår</a> om den nærmeste stjerne</li></ul> <ul><li>Ross 128b i en afstand af 11 <a href="/wiki/Lys%C3%A5r" title="Lysår">lysår</a> <sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Liv_på_exoplanter"><span id="Liv_p.C3.A5_exoplanter"></span>Liv på exoplanter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=10" title="Redigér afsnit: Liv på exoplanter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=10" title="Edit section's source code: Liv på exoplanter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Det mest interessante spørgsmål er om der findes <a href="/wiki/Liv" title="Liv">liv</a> andre steder i universet og nu spørger forskernes sig om der er liv på exoplaneterne. Foreløbig har forskerne koncentreret sig om at finde vand på exoplaneterne, som den essentielle forudsætning for liv som vi kender det; om exoplaneten er en <a href="/wiki/Vandverden" title="Vandverden">vandverden</a>. Der er som bekendt ikke modtaget nogen kommunikation fra fremmede livsformer i universet, og om de mulige livsformer i universet prøver at kommunikere med os via bevidste signaler, er nok mere usandsynligt, end at vi kan finde spor efter fremmede livsformer. Forskere regner med at flygtige molekyler kan være spor efter liv<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> og har konstrueret en check-liste af 14.000 molekyler med op til 6 atomer, der kan være potentielt flygtige. På listen er der 2.500 molekyler af CNOPSH (C – <a href="/wiki/Carbon" title="Carbon">carbon</a>, N – <a href="/wiki/Nitrogen" class="mw-redirect" title="Nitrogen">nitrogen</a>, O – <a href="/wiki/Oxygen" class="mw-redirect" title="Oxygen">oxygen</a>, P – <a href="/wiki/Fosfor" title="Fosfor">fosfor</a>, S – <a href="/wiki/Svovl" title="Svovl">svovl</a>, og H – <a href="/wiki/Hydrogen" class="mw-redirect" title="Hydrogen">hydrogen</a>). Forskerne foreslår at der konstrueres måleinstrumenter, der skal kunne detektere sådanne molekyler i exoplaneternes atmosfære.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Exoplaneter_i_den_beboelige_zone">Exoplaneter i den beboelige zone</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=11" title="Redigér afsnit: Exoplaneter i den beboelige zone" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=11" title="Edit section's source code: Exoplaneter i den beboelige zone"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Listen over exoplaneter i <a href="/wiki/Den_beboelige_zone" title="Den beboelige zone">den beboelige zone</a> føres løbende i Habitable exoplanets catalog.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> Her er nogle exoplaneter, som er kandidater til planeter med liv: </p> <ul><li>LHS1140b <sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></li> <li>TRAPPIST-1 <sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li> <li>Gliese 625b <sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Kepler-186f" title="Kepler-186f">Kepler-186f</a>, Keppler 22b, Gliese 581g, Gliese 667Cc, <a href="/wiki/Kepler-22b" title="Kepler-22b">Kepler-22b</a>, HD 40307g, HD 85512b, Tau Ceti e, Gliese 163c, Gliese 581d, Tau Ceti f <sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup></li> <li>WASP-17b, HD209458b, WASP-12b, WASP-19b og XO-1b</li></ul> <div class="mw-heading mw-heading2"><h2 id="Milepæle_og_rekorder_blandt_exoplaneter"><span id="Milep.C3.A6le_og_rekorder_blandt_exoplaneter"></span>Milepæle og rekorder blandt exoplaneter</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=12" title="Redigér afsnit: Milepæle og rekorder blandt exoplaneter" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=12" title="Edit section's source code: Milepæle og rekorder blandt exoplaneter"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="0" align="Right"> <tbody><tr> <td> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Kepler186f-ArtistConcept-20140417.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Kepler186f-ArtistConcept-20140417.jpg/220px-Kepler186f-ArtistConcept-20140417.jpg" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Kepler186f-ArtistConcept-20140417.jpg/330px-Kepler186f-ArtistConcept-20140417.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Kepler186f-ArtistConcept-20140417.jpg/440px-Kepler186f-ArtistConcept-20140417.jpg 2x" data-file-width="4534" data-file-height="2550" /></a><figcaption>Kepler-186f: En <a href="/wiki/Jorden" title="Jorden">jordstørrelse</a> exoplanet i den <a href="/wiki/Beboelige_zone" class="mw-redirect" title="Beboelige zone">beboelige zone</a> af sin værtsstjerne. (<i>Kunstnerisk illustration, 17. april 2014</i>.)</figcaption></figure> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Artwork_showing_a_blurred_globe_and_other_celestial_bodies,_inspired_by_the_asteroid_belt_of_HD_69830.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg/250px-Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg" decoding="async" width="250" height="200" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg/375px-Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg/500px-Artwork_showing_a_blurred_globe_and_other_celestial_bodies%2C_inspired_by_the_asteroid_belt_of_HD_69830.jpg 2x" data-file-width="3000" data-file-height="2400" /></a><figcaption>En kunstners fremstilling af exoplaneten <a href="/w/index.php?title=HD_69830_d&action=edit&redlink=1" class="new" title="HD 69830 d (ikke skrevet endnu)">HD 69830 d</a>, med stjernen <a href="/w/index.php?title=HD_69830&action=edit&redlink=1" class="new" title="HD 69830 (ikke skrevet endnu)">HD 69830</a> og dens <a href="/wiki/Asteroideb%C3%A6lte" title="Asteroidebælte">asteroidebælte</a> i baggrunden.</figcaption></figure> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg/250px-Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg/375px-Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/44/Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg/500px-Artist%27s_impression_of_pulsar_planet_B1620-26c.jpg 2x" data-file-width="4000" data-file-height="3000" /></a><figcaption>En kunstners fremstilling af den omkring 13 milliarder år gamle <a href="/w/index.php?title=Pulsarplanet&action=edit&redlink=1" class="new" title="Pulsarplanet (ikke skrevet endnu)">pulsarplanet</a> <a href="/w/index.php?title=PSR_B1620-26c&action=edit&redlink=1" class="new" title="PSR B1620-26c (ikke skrevet endnu)">PSR B1620-26c</a>.</figcaption></figure> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Triple-star_sunset.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Triple-star_sunset.jpg/250px-Triple-star_sunset.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Triple-star_sunset.jpg/375px-Triple-star_sunset.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/90/Triple-star_sunset.jpg/500px-Triple-star_sunset.jpg 2x" data-file-width="3200" data-file-height="2400" /></a><figcaption>En kunstners fremstilling af en "tredobbelt" solnedgang, set fra en hypotetisk måne i kredsløb om exoplaneten <a href="/w/index.php?title=HD_188753_Ab&action=edit&redlink=1" class="new" title="HD 188753 Ab (ikke skrevet endnu)">HD 188753 Ab</a>.</figcaption></figure> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/250px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/375px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/27/Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg/500px-Artist%27s_Concept_of_Exoplanet_OGLE-2005-BLG-390L_b.jpg 2x" data-file-width="4000" data-file-height="3000" /></a><figcaption>En kunstners fremstilling af den lille, kolde OGLE-2005-BLG-390Lb med den røde dværgstjerne-"sol" i baggrunden.</figcaption></figure> </td></tr></tbody></table> <p>Ud af de få oplysninger vi kan måle os til, tegner der sig et billede af ekstreme og usædvanlige verdener, som i nogle tilfælde kuldkaster væsentlige dele af vore hidtidige teorier for hvordan planeter dannes og udvikler sig. </p> <div class="mw-heading mw-heading3"><h3 id="Kepler-186f">Kepler-186f</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=13" title="Redigér afsnit: Kepler-186f" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=13" title="Edit section's source code: Kepler-186f"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="detail"><span><span typeof="mw:File"><span title="Uddybende"><img alt="Uddybende" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/15px-Searchtool.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/23px-Searchtool.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/61/Searchtool.svg/30px-Searchtool.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span> <span>Uddybende artikel: <a href="/wiki/Kepler-186f" title="Kepler-186f">Kepler-186f</a></span></span></div> <p>Kepler-186f er en exoplanet, som er i kredsløb om den <a href="/wiki/R%C3%B8de_dv%C3%A6rg" class="mw-redirect" title="Røde dværg">røde dværg</a> <a href="/w/index.php?title=Kepler-186&action=edit&redlink=1" class="new" title="Kepler-186 (ikke skrevet endnu)">Kepler-186</a>, ca. 493 <a href="/wiki/Lys%C3%A5r" title="Lysår">lysår</a> fra <a href="/wiki/Jorden" title="Jorden">jorden</a>. Kepler-186f er den første <a href="/wiki/Planet" title="Planet">planet</a> med en radius der er sammenlignelig med jordens og som er i den <a href="/wiki/Beboelige_zone" class="mw-redirect" title="Beboelige zone">beboelige zone</a> af en anden stjerne. <a href="/wiki/NASA" title="NASA">NASAs</a> <a href="/wiki/Keplerteleskopet" class="mw-redirect" title="Keplerteleskopet">Keplerteleskop</a> opdagede Kepler-186f via <a href="/wiki/Astronomisk_passage" title="Astronomisk passage">passagemetoden</a>. Resultatet blev præsenteret på en konference i 2014. </p> <div class="mw-heading mw-heading3"><h3 id="HD_209458_b">HD 209458 b</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=14" title="Redigér afsnit: HD 209458 b" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=14" title="Edit section's source code: HD 209458 b"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=HD_209458_b&action=edit&redlink=1" class="new" title="HD 209458 b (ikke skrevet endnu)">HD 209458 b</a> blev først "afsløret" med radialhastighedsmetoden, men blev senere observeret da den passerede ind foran sin stjerne. I 2001 observerede et hold astronomer HD 209458 b's <a href="/wiki/Atmosf%C3%A6re_(himmellegeme)" title="Atmosfære (himmellegeme)">atmosfære</a>, og fandt det spektroskopiske "fingeraftryk" af <a href="/wiki/Natrium" title="Natrium">natrium</a> — det var dog ikke nær så intenst som man havde forventet, hvilket antyder at et højtliggende skylag delvis har "spærret for udsigten" ind til de dybereliggende atmosfærelag. </p> <div class="mw-heading mw-heading3"><h3 id="PSR_B1620-26c">PSR B1620-26c</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=15" title="Redigér afsnit: PSR B1620-26c" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=15" title="Edit section's source code: PSR B1620-26c"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Den 10. juli 2005 undersøgte et hold videnskabsmænd ledet af Steinn Sigurdsson, nogle observationsdata fra <a href="/wiki/Hubble-rumteleskopet" title="Hubble-rumteleskopet">Hubble-rumteleskopet</a>: De fandt den hidtil ældste exoplanet, 13 milliarder år gammel, og den eneste der vides at kredse om begge "medlemmer" af en dobbeltstjerne (flere andre exoplaneter kredser om ét af "medlemmerne" i et dobbeltstjernesystem). Planeten er omkring dobbelt så stor som Jupiter, og kredser om en pulsar og en <a href="/wiki/Hvid_dv%C3%A6rg" title="Hvid dværg">hvid dværgstjerne</a>. </p> <div class="mw-heading mw-heading3"><h3 id="My_Arae_d">My Arae d</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=16" title="Redigér afsnit: My Arae d" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=16" title="Edit section's source code: My Arae d"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I august 2004 fandt <a href="/wiki/European_Southern_Observatory" title="European Southern Observatory">ESOs</a> <a href="/w/index.php?title=HARPS&action=edit&redlink=1" class="new" title="HARPS (ikke skrevet endnu)">HARPS</a>-spektograf en planet med ca. 14 gange Jordens masse, i kredsløb om stjernen <a href="/w/index.php?title=My_Arae&action=edit&redlink=1" class="new" title="My Arae (ikke skrevet endnu)">My Arae</a>: Det er den tredjeletteste exoplanet man hidtil har fundet, og den kan vise sig at være den første Jord-lignende planet vi har set udenfor vores eget solsystem. </p> <div class="mw-heading mw-heading3"><h3 id="TrES-1">TrES-1</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=17" title="Redigér afsnit: TrES-1" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=17" title="Edit section's source code: TrES-1"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Denne planet blev opdaget under den såkaldte <a href="/w/index.php?title=Trans-Atlantic_Exoplanet_Survey&action=edit&redlink=1" class="new" title="Trans-Atlantic Exoplanet Survey (ikke skrevet endnu)">Trans-Atlantic Exoplanet Survey</a> (forkortet TrES) med et automatiseret teleskop der måler blot 10 <a href="/wiki/Centimeter" title="Centimeter">centimeter</a> i <a href="/wiki/Diameter" title="Diameter">diameter</a>: Den fik den midlertidige betegnelse TrES-1, og blev senere bekræftet ved observationer fra <a href="/w/index.php?title=Keck-observatoriet&action=edit&redlink=1" class="new" title="Keck-observatoriet (ikke skrevet endnu)">Keck-observatoriet</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Gliese_876_og_dens_planetsystem">Gliese 876 og dens planetsystem</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=18" title="Redigér afsnit: Gliese 876 og dens planetsystem" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=18" title="Edit section's source code: Gliese 876 og dens planetsystem"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Den <a href="/wiki/R%C3%B8d_dv%C3%A6rg" title="Rød dværg">røde dværgstjerne</a> <a href="/w/index.php?title=Gliese_876&action=edit&redlink=1" class="new" title="Gliese 876 (ikke skrevet endnu)">Gliese 876</a> udmærker sig ved at være omkredset af hele tre kendte planeter, hvoraf <a href="/wiki/Gliese_876_d" title="Gliese 876 d">Gliese 876 d</a> har en masse der er blot 7½ gange så stor som Jorden: Denne planet er næsten helt sikkert en klode af klippemateriale ligesom Jorden. Den kredser om Gliese 876 i en afstand på blot 2,08% af afstanden mellem Jorden og Solen, og fuldfører et omløb på 1,937 <a href="/wiki/D%C3%B8gn" title="Døgn">døgn</a>. </p> <div class="mw-heading mw-heading3"><h3 id="HD_149026_b">HD 149026 b</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=19" title="Redigér afsnit: HD 149026 b" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=19" title="Edit section's source code: HD 149026 b"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=HD_149026_b&action=edit&redlink=1" class="new" title="HD 149026 b (ikke skrevet endnu)">HD 149026 b</a>, som kredser om stjernen <a href="/w/index.php?title=HD_149026&action=edit&redlink=1" class="new" title="HD 149026 (ikke skrevet endnu)">HD 149026</a>, udmærker sig ved at have den størst kerne for nogen kendt planet, med en masse 70 gange så stor som Jordens, eller to tredjedele af hele planetens masse. </p> <div class="mw-heading mw-heading3"><h3 id="HD_188753_Ab">HD 188753 Ab</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=20" title="Redigér afsnit: HD 188753 Ab" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=20" title="Edit section's source code: HD 188753 Ab"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I juli 2005 opdagede man exoplaneten <a href="/w/index.php?title=HD_188753_Ab&action=edit&redlink=1" class="new" title="HD 188753 Ab (ikke skrevet endnu)">HD 188753 Ab</a> kredsende i en afstand af blot 30 millioner kilometer omkring <a href="/w/index.php?title=HD_188753&action=edit&redlink=1" class="new" title="HD 188753 (ikke skrevet endnu)">HD 188753</a>; den største af tre "medlemmer" af et dobbeltstjernesystem, som i forvejen kredser tæt omkring hinanden: Planeten er godt og vel på størrelse med Jupiter, og fuldfører et omløb på 3,3 døgn. De to mindre stjerner kredser om hinanden én gang på blot 156 dage, og sammen kredser de om hovedstjernen i en afstand der svarer til afstanden fra vor Sol til et sted mellem Saturn og Uranus. De relativt små afstande og korte omløbstider rejser alvorlig tvivl om vore hidtidige teorier for planetsystemers dannelse og udvikling. </p> <div class="mw-heading mw-heading3"><h3 id="OGLE-2005-BLG-390Lb">OGLE-2005-BLG-390Lb</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=21" title="Redigér afsnit: OGLE-2005-BLG-390Lb" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=21" title="Edit section's source code: OGLE-2005-BLG-390Lb"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Planeten <a href="/wiki/OGLE-2005-BLG-390Lb" title="OGLE-2005-BLG-390Lb">OGLE-2005-BLG-390Lb</a> blev opdaget ved sin gravitationelle mikrolinse-effekt den <a href="/wiki/25._januar" title="25. januar">25. januar</a> <a href="/wiki/2006" title="2006">2006</a>, og udmærker sig på to punkter: Med en masse på blot 5½ gange Jordens er det den hidtil mindste exoplanet man har opdaget. Samtidig har den rekorden i afstand til "sin" stjerne; 2,6 gange Jordens afstand fra Solen. Da den samtidig kredser om en lyssvag rød dværgstjerne, er den formodentlig også den koldeste af de kendte exoplaneter. </p> <div class="mw-heading mw-heading3"><h3 id="HAT-P-1b">HAT-P-1b</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=22" title="Redigér afsnit: HAT-P-1b" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=22" title="Edit section's source code: HAT-P-1b"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I 2006 opdagede man ved hjælp af et netværk af små automatiske teleskoper kaldet "HAT", en exoplanet som siden har fået betegnelsen <a href="/w/index.php?title=HAT-P-1b&action=edit&redlink=1" class="new" title="HAT-P-1b (ikke skrevet endnu)">HAT-P-1b</a>: Den er 38% større end Jupiter målt på diameteren, men har en <a href="/wiki/Massefylde" title="Massefylde">massefylde</a> på blot halvdelen af Jupiters, og sætter dermed "bundrekord" i massefylde. HD 209458 b består tilsyneladende også af temmelig "let" materiale, og indtil nu har man ikke nogen teori der forklarer hvordan sådan nogle store men "lette" planeter kan dannes. </p> <div class="mw-heading mw-heading3"><h3 id="SWEEPS-10">SWEEPS-10</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=23" title="Redigér afsnit: SWEEPS-10" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=23" title="Edit section's source code: SWEEPS-10"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Exoplaneten <a href="/w/index.php?title=SWEEPS-10&action=edit&redlink=1" class="new" title="SWEEPS-10 (ikke skrevet endnu)">SWEEPS-10</a> har den korteste omløbstid for alle kendte planeter; dens "år", dvs. den tid det tager at fuldføre et omløb om sin stjerne, er kun 10 timer langt. Afstanden mellem SWEEPS-10 og dens stjerne er omkring tre gange afstanden fra Jorden til <a href="/wiki/M%C3%A5nen" title="Månen">Månen</a>. Denne opdagelse drager også vore teorier om planetdannelse i tvivl. </p> <div class="mw-heading mw-heading3"><h3 id="Tau_Boötis_b"><span id="Tau_Bo.C3.B6tis_b"></span>Tau Boötis b</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=24" title="Redigér afsnit: Tau Boötis b" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=24" title="Edit section's source code: Tau Boötis b"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Tau Boötis b er en "varm Jupiter" på en afstand af kun 51 lysår fra Jorden med vand og kulmonoxid i atmosfæren.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Se_også"><span id="Se_ogs.C3.A5"></span>Se også</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=25" title="Redigér afsnit: Se også" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=25" title="Edit section's source code: Se også"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Biosignatur" title="Biosignatur">Biosignatur</a></li> <li><a href="/wiki/Borgervidenskab" title="Borgervidenskab">Borgervidenskab</a></li> <li><a href="/wiki/Brahe_(exoplanet)" title="Brahe (exoplanet)">Brahe (exoplanet)</a></li> <li><a href="/wiki/Fermis_paradoks" title="Fermis paradoks">Fermis paradoks</a></li> <li><a href="/wiki/Drakes_ligning" title="Drakes ligning">Drakes ligning</a></li> <li><a href="/wiki/Kepler-22b" title="Kepler-22b">Kepler-22b</a></li> <li><a href="/wiki/Liste_over_exoplanetsystemer" class="mw-redirect" title="Liste over exoplanetsystemer">Liste over exoplanetsystemer</a></li> <li><a href="/wiki/SETI" title="SETI">SETI</a></li> <li><a href="/wiki/Udenjordisk_liv" title="Udenjordisk liv">Udenjordisk liv</a></li> <li><a href="/wiki/Vandverden" title="Vandverden">Vandverden</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referencer">Referencer</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=26" title="Redigér afsnit: Referencer" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=26" title="Edit section's source code: Referencer"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r11780210">.mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width reflist-columns-2"> <ol class="references"> <li id="cite_note-1"><span 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a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output 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Hentet 20. januar 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Planet+Quest.+NASA&rft_id=http%3A%2F%2Fplanetquest.jpl.nasa.gov.%2F&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.space.com/18790-habitable-exoplanets-catalog-photos.html">"10 Exoplanets That Could Host Alien Life. Space.com"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170423093807/http://www.space.com/18790-habitable-exoplanets-catalog-photos.html">Arkiveret</a> fra originalen 23. april 2017<span class="reference-accessdate">. Hentet 22. juni 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=10+Exoplanets+That+Could+Host+Alien+Life.+Space.com&rft_id=http%3A%2F%2Fwww.space.com%2F18790-habitable-exoplanets-catalog-photos.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.sciencemag.org/news/2016/08/earth-planet-found-orbiting-our-nearest-stellar-neighbor">"Earth-like planet found orbiting our nearest stellar neighbor. Science 2016"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170104000759/http://www.sciencemag.org/news/2016/08/earth-planet-found-orbiting-our-nearest-stellar-neighbor">Arkiveret</a> fra originalen 4. januar 2017<span class="reference-accessdate">. Hentet 3. januar 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Earth-like+planet+found+orbiting+our+nearest+stellar+neighbor.+Science+2016&rft_id=http%3A%2F%2Fwww.sciencemag.org%2Fnews%2F2016%2F08%2Fearth-planet-found-orbiting-our-nearest-stellar-neighbor&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><a href="#cite_ref-7">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140331215722/http://www2.astro.psu.edu/users/alex/pulsar_planets_text.html">"Planets around pulsars"</a>. Arkiveret fra <a rel="nofollow" class="external text" href="http://www2.astro.psu.edu/users/alex/pulsar_planets_text.html">originalen</a> 31. marts 2014<span class="reference-accessdate">. Hentet 13. marts 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Planets+around+pulsars&rft_id=http%3A%2F%2Fwww2.astro.psu.edu%2Fusers%2Falex%2Fpulsar_planets_text.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><a href="#cite_ref-8">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://exoplanets.nasa.gov/news/1404/a-four-planet-system-in-orbit-directly-imaged-and-remarkable/">"A four-planet system in orbit, directly imaged and remarkable. NASA 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170317054518/https://exoplanets.nasa.gov/news/1404/a-four-planet-system-in-orbit-directly-imaged-and-remarkable/">Arkiveret</a> fra originalen 17. marts 2017<span class="reference-accessdate">. Hentet 16. marts 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=A+four-planet+system+in+orbit%2C+directly+imaged+and+remarkable.+NASA+2017&rft_id=https%3A%2F%2Fexoplanets.nasa.gov%2Fnews%2F1404%2Fa-four-planet-system-in-orbit-directly-imaged-and-remarkable%2F&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-space-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-space_9-0"><sup>a</sup></a> <a href="#cite_ref-space_9-1"><sup>b</sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.space.com/42301-kepler-space-telescope-ultimate-fate.html">"<i>NASA's Planet-Hunting Kepler Space Telescope Is Done. What Will Happen to It?</i>, space.com, 31. oktober 2018"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20181101082440/https://www.space.com/42301-kepler-space-telescope-ultimate-fate.html">Arkiveret</a> fra originalen 1. november 2018<span class="reference-accessdate">. Hentet 1. november 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=NASA%27s+Planet-Hunting+Kepler+Space+Telescope+Is+Done.+What+Will+Happen+to+It%3F%2C+space.com%2C+31.+oktober+2018&rft_id=https%3A%2F%2Fwww.space.com%2F42301-kepler-space-telescope-ultimate-fate.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><a href="#cite_ref-10">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://exoplanetarchive.ipac.caltech.edu/docs/counts_detail.html">"Exoplanet Archive Planet Counts"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190408115911/https://exoplanetarchive.ipac.caltech.edu/docs/counts_detail.html">Arkiveret</a> fra originalen 8. april 2019<span class="reference-accessdate">. Hentet 28. februar 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Exoplanet+Archive+Planet+Counts&rft_id=http%3A%2F%2Fexoplanetarchive.ipac.caltech.edu%2Fdocs%2Fcounts_detail.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><a href="#cite_ref-11">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFFischerJeff_Valenti2005" class="citation journal cs1">Fischer, Debra A.; Jeff Valenti (2005-04-01). <a rel="nofollow" class="external text" href="http://iopscience.iop.org/0004-637X/622/2/1102">"The Planet-Metallicity Correlation"</a>. <i>The Astrophysical Journal</i>. <b>622</b> (2): 1102-1117. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110602225131/http://iopscience.iop.org/0004-637X/622/2/1102/">Arkiveret</a> fra originalen 2. juni 2011<span class="reference-accessdate">. Hentet <span class="nowrap">2012-03-07</span></span>. <q>From this subset of stars, we determine that fewer than 3% of stars with -0.5 < [Fe/H] < 0.0 have Doppler-detected planets. Above solar metallicity, there is a smooth and rapid rise in the fraction of stars with planets.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal&rft.atitle=The+Planet-Metallicity+Correlation&rft.volume=622&rft.issue=2&rft.pages=1102-1117&rft.date=2005-04-01&rft.aulast=Fischer&rft.aufirst=Debra+A.&rft.au=Jeff+Valenti&rft_id=http%3A%2F%2Fiopscience.iop.org%2F0004-637X%2F622%2F2%2F1102&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><a href="#cite_ref-12">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.theguardian.com/science/across-the-universe/2017/nov/15/potentially-habitable-world-found-just-11-light-years-away-ross-128-b?CMP=fb_gu">"Potentially habitable world found just 11 light years away. The Guardian 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171201042743/https://www.theguardian.com/science/across-the-universe/2017/nov/15/potentially-habitable-world-found-just-11-light-years-away-ross-128-b?CMP=fb_gu">Arkiveret</a> fra originalen 1. december 2017<span class="reference-accessdate">. Hentet 19. november 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Potentially+habitable+world+found+just+11+light+years+away.+The+Guardian+2017&rft_id=https%3A%2F%2Fwww.theguardian.com%2Fscience%2Facross-the-universe%2F2017%2Fnov%2F15%2Fpotentially-habitable-world-found-just-11-light-years-away-ross-128-b%3FCMP%3Dfb_gu&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><a href="#cite_ref-13">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://advances.sciencemag.org/content/1/2/e1500047.full">"The search for signs of life on exoplanets at the interface of chemistry and planetary science. Science Advances 2015"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171008030213/http://advances.sciencemag.org/content/1/2/e1500047.full">Arkiveret</a> fra originalen 8. oktober 2017<span class="reference-accessdate">. Hentet 7. oktober 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+search+for+signs+of+life+on+exoplanets+at+the+interface+of+chemistry+and+planetary+science.+Science+Advances+2015&rft_id=http%3A%2F%2Fadvances.sciencemag.org%2Fcontent%2F1%2F2%2Fe1500047.full&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><a href="#cite_ref-14">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.sci-news.com/astronomy/list-biosignature-gases-search-extraterrestrial-life-03845.html">"Astrobiologists Make List of Biosignature Gases to Guide Search for Extraterrestrial Life. Sci-News.com 2016"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160509042751/http://www.sci-news.com/astronomy/list-biosignature-gases-search-extraterrestrial-life-03845.html">Arkiveret</a> fra originalen 9. maj 2016<span class="reference-accessdate">. Hentet 8. maj 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Astrobiologists+Make+List+of+Biosignature+Gases+to+Guide+Search+for+Extraterrestrial+Life.+Sci-News.com+2016&rft_id=http%3A%2F%2Fwww.sci-news.com%2Fastronomy%2Flist-biosignature-gases-search-extraterrestrial-life-03845.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><a href="#cite_ref-15">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://phl.upr.edu/projects/habitable-exoplanets-catalog">"Habitable exoplanets catalog. HPL"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180211104253/http://phl.upr.edu/projects/habitable-exoplanets-catalog">Arkiveret</a> fra originalen 11. februar 2018<span class="reference-accessdate">. Hentet 20. maj 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Habitable+exoplanets+catalog.+HPL&rft_id=http%3A%2F%2Fphl.upr.edu%2Fprojects%2Fhabitable-exoplanets-catalog&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><a href="#cite_ref-16">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.space.com/36521-alien-planet-best-bet-search-for-life.html">"Newfound Alien Planet Is Best Place Yet to Search for Life. Space.com 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170422125959/http://www.space.com/36521-alien-planet-best-bet-search-for-life.html">Arkiveret</a> fra originalen 22. april 2017<span class="reference-accessdate">. Hentet 20. maj 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Newfound+Alien+Planet+Is+Best+Place+Yet+to+Search+for+Life.+Space.com+2017&rft_id=http%3A%2F%2Fwww.space.com%2F36521-alien-planet-best-bet-search-for-life.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><a href="#cite_ref-17">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite id="CITEREFMorten_Greve2017" class="citation news cs1">Morten Greve (22. februar 2017). <a rel="nofollow" class="external text" href="http://www.dr.dk/nyheder/viden/naturvidenskab/stjernesystem-med-rekordmange-jordlignende-planeter-fundet">"Stjernesystem med rekordmange jordlignende planeter fundet"</a>. <a href="/wiki/DR" title="DR">DR</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170223213049/http://www.dr.dk/nyheder/viden/naturvidenskab/stjernesystem-med-rekordmange-jordlignende-planeter-fundet">Arkiveret</a> fra originalen 23. februar 2017<span class="reference-accessdate">. Hentet 23. februar 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Stjernesystem+med+rekordmange+jordlignende+planeter+fundet&rft.date=2017-02-22&rft.au=Morten+Greve&rft_id=http%3A%2F%2Fwww.dr.dk%2Fnyheder%2Fviden%2Fnaturvidenskab%2Fstjernesystem-med-rekordmange-jordlignende-planeter-fundet&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><a href="#cite_ref-18">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.space.com/35806-trappist-1-facts.html">"TRAPPIST-1: System with 7 Earth-Size Exoplanets. Space.com 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170228195748/http://www.space.com/35806-trappist-1-facts.html">Arkiveret</a> fra originalen 28. februar 2017<span class="reference-accessdate">. Hentet 20. maj 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=TRAPPIST-1%3A+System+with+7+Earth-Size+Exoplanets.+Space.com+2017&rft_id=http%3A%2F%2Fwww.space.com%2F35806-trappist-1-facts.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><a href="#cite_ref-19">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.theguardian.com/science/2017/may/18/atmosphere-discovery-makes-trappist-1-exoplanet-priority-in-hunt-for-alien-life#img-1">"Atmosphere discovery makes Trappist-1 exoplanet priority in hunt for alien life. The Guardian 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170520092728/https://www.theguardian.com/science/2017/may/18/atmosphere-discovery-makes-trappist-1-exoplanet-priority-in-hunt-for-alien-life#img-1">Arkiveret</a> fra originalen 20. maj 2017<span class="reference-accessdate">. Hentet 20. maj 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Atmosphere+discovery+makes+Trappist-1+exoplanet+priority+in+hunt+for+alien+life.+The+Guardian+2017&rft_id=https%3A%2F%2Fwww.theguardian.com%2Fscience%2F2017%2Fmay%2F18%2Fatmosphere-discovery-makes-trappist-1-exoplanet-priority-in-hunt-for-alien-life%23img-1&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><a href="#cite_ref-20">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.sci-news.com/astronomy/life-trappist-1-planets-05041.html">"Astrophysicists Identify Major Challenges for Development of Life on TRAPPIST-1 Planets. Scinews 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170718025512/http://www.sci-news.com/astronomy/life-trappist-1-planets-05041.html">Arkiveret</a> fra originalen 18. juli 2017<span class="reference-accessdate">. Hentet 16. juli 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Astrophysicists+Identify+Major+Challenges+for+Development+of+Life+on+TRAPPIST-1+Planets.+Scinews+2017&rft_id=http%3A%2F%2Fwww.sci-news.com%2Fastronomy%2Flife-trappist-1-planets-05041.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><a href="#cite_ref-21">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.sci-news.com/astronomy/gliese-625b-super-earth-04912.html">"Gliese 625b: Potentially Habitable Super-Earth Spotted 21 Light-Years Away. Sci-News 2017"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170604021430/http://www.sci-news.com/astronomy/gliese-625b-super-earth-04912.html">Arkiveret</a> fra originalen 4. juni 2017<span class="reference-accessdate">. Hentet 3. juni 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Gliese+625b%3A+Potentially+Habitable+Super-Earth+Spotted+21+Light-Years+Away.+Sci-News+2017&rft_id=http%3A%2F%2Fwww.sci-news.com%2Fastronomy%2Fgliese-625b-super-earth-04912.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><a href="#cite_ref-22">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.space.com/18790-habitable-exoplanets-catalog-photos.html">"10 Exoplanets That Could Host Alien Life. Space com 2014"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170423093807/http://www.space.com/18790-habitable-exoplanets-catalog-photos.html">Arkiveret</a> fra originalen 23. april 2017<span class="reference-accessdate">. Hentet 22. juni 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=10+Exoplanets+That+Could+Host+Alien+Life.+Space+com+2014&rft_id=http%3A%2F%2Fwww.space.com%2F18790-habitable-exoplanets-catalog-photos.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><a href="#cite_ref-23">^</a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r11752076"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.livescience.com/43666-water-vapor-exoplanet-hot-jupiter.html">"Water Found in Atmosphere of Nearby Alien Planet. Livescience"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20140307062634/http://www.livescience.com/43666-water-vapor-exoplanet-hot-jupiter.html">Arkiveret</a> fra originalen 7. marts 2014<span class="reference-accessdate">. Hentet 1. marts 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Water+Found+in+Atmosphere+of+Nearby+Alien+Planet.+Livescience&rft_id=http%3A%2F%2Fwww.livescience.com%2F43666-water-vapor-exoplanet-hot-jupiter.html&rfr_id=info%3Asid%2Fda.wikipedia.org%3AExoplanet" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Eksterne_henvisninger">Eksterne henvisninger</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Exoplanet&veaction=edit&section=27" title="Redigér afsnit: Eksterne henvisninger" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Exoplanet&action=edit&section=27" title="Edit section's source code: Eksterne henvisninger"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox sisterproject"> <tbody><tr> <td style="width:50px; height:67px;"><figure class="mw-halign-none" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/50px-Commons-logo.svg.png" decoding="async" width="50" height="67" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/75px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/100px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span><figcaption></figcaption></figure> </td> <td style="padding-left:5px;"><a href="https://commons.wikimedia.org/wiki/Forside" class="extiw" title="commons:Forside">Wikimedia Commons</a> har medier relateret til: <div style="margin-left: 10px;"> <i><b><a href="https://commons.wikimedia.org/wiki/Category:Exoplanets" class="extiw" title="commons:Category:Exoplanets">Exoplaneter</a></b></i></div> </td></tr></tbody></table> <ul><li><a rel="nofollow" class="external text" href="https://phl.upr.edu/">The Habitable Exoplanets Catalog – Katalog over de beboelige exoplaneter</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20111120174002/http://phl.upr.edu/">Arkiveret</a> 20. november 2011 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://exoplanet.eu/">The Extrasolar Planets Encyclopaedia</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110520041703/http://exoplanet.eu/planet.php?p1=HD">Arkiveret</a> 20. maj 2011 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> og <a rel="nofollow" class="external text" href="http://cfa-www.harvard.edu/planets/">The Extrasolar Planets Encyclopaedia</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20040901085103/http://cfa-www.harvard.edu/planets/">Arkiveret</a> 1. september 2004 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://www.earthsky.org/clear-voices/51301/stephane-udry">What do we really know about life in the universe? link to podcast</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080514000700/http://www.earthsky.org/clear-voices/51301/stephane-udry">Arkiveret</a> 14. maj 2008 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="https://www.hpcf.upr.edu/~abel/phl/exomaps/exoplanets_stellar_map_full.png">Afstandskort over stjernesystemer med exoplaneter. PHL</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20161203193919/http://www.hpcf.upr.edu/~abel/phl/exomaps/exoplanets_stellar_map_full.png">Arkiveret</a> 3. december 2016 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://www.princeton.edu/~willman/planetary_systems/">Table of known planetary systems</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060913204111/http://www.princeton.edu/%7Ewillman/planetary_systems/">Arkiveret</a> 13. september 2006 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li><a rel="nofollow" class="external text" href="http://astro.nickshanks.com/library/extrasolar.xml">Extrasolar Planet XML Database</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20061004111717/http://astro.nickshanks.com/library/extrasolar.xml">Arkiveret</a> 4. oktober 2006 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></li> <li>Andrew Collier Cameron, <i>Extrasolar planets</i>, Physics World (January 2001). (See the <a rel="nofollow" class="external text" href="http://physicsweb.org/article/world/14/1/7/2">online version</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20040808111623/http://physicsweb.org/article/world/14/1/7/2">Arkiveret</a> 8. august 2004 hos <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.)</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r11759279">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol 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