{"id":7910,"date":"2015-09-07T00:00:03","date_gmt":"2015-09-06T22:00:03","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=7910"},"modified":"2015-08-01T06:52:22","modified_gmt":"2015-08-01T04:52:22","slug":"une-exoplanete-decouverte-dans-la-proche-banlieue-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-exoplanete-decouverte-dans-la-proche-banlieue-de-la-terre\/","title":{"rendered":"Une exoplan\u00e8te d\u00e9couverte dans la proche banlieue de la Terre"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Des astronomes ont d\u00e9couvert la plan\u00e8te tellurique la plus proche connue en dehors de notre syst\u00e8me solaire, a confirm\u00e9 jeudi 30 juillet l\u2019universit\u00e9 de Li\u00e8ge, en Belgique. Situ\u00e9e \u00e0 21 ann\u00e9es-\u00adlumi\u00e8re de la Terre, soit \u00abun jet de pierre \u00e0 l\u2019\u00e9chelle de la galaxie\u00bb, cette exoplan\u00e8te pourrait \u00eatre \u00abune mine d\u2019or\u00bb pour la science, a expliqu\u00e9 l\u2019Agence spatiale am\u00e9ricaine (NASA).<\/p>\n<p>Baptis\u00e9e HD 219134b, cette exoplan\u00e8te \u00e0 la densit\u00e9 et \u00e0 la composition similaire \u00e0 celle de la Terre orbite trop pr\u00e8s de son \u00e9toile \u2013 elle tourne autour d\u2019elle en trois jours \u2013 pour \u00eatre habitable. Fait particuli\u00e8rement int\u00e9ressant pour les scientifiques, elle passe r\u00e9guli\u00e8rement entre son \u00e9toile et la Terre, occasionnant un ph\u00e9nom\u00e8ne dit du \u00abtransit\u00bb ou une mini-\u00e9clipse, qui doit permettre une \u00e9tude d\u00e9taill\u00e9e de ses propri\u00e9t\u00e9s.<\/p>\n<p>Une \u00abvoisine de palier\u00bb<\/p>\n<p>\u00abLa plupart des exoplan\u00e8tes en transit de taille comparable \u00e0 la Terre sont \u00e0 des centaines d\u2019ann\u00e9es-\u00adlumi\u00e8re de distance, bien trop loin pour rendre possible leur \u00e9tude d\u00e9taill\u00e9e avec les t\u00e9lescopes actuels ou m\u00eame futurs. Au contraire, cette nouvelle plan\u00e8te est une voisine de palier, ce qui ouvre un tas de perspectives enthousiasmantes quant \u00e0 son \u00e9tude d\u00e9taill\u00e9e\u00bb, a expliqu\u00e9 Micha\u00ebl Gillon, astronome \u00e0 l\u2019Universit\u00e9 de Li\u00e8ge.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>Selon le communiqu\u00e9 de l\u2019universit\u00e9, l\u2019\u00e9clat de l\u2019\u00e9toile faiblit lors des \u00abtransits\u00bb, et ces chutes de brillance peuvent r\u00e9v\u00e9ler non seulement la taille d\u2019une plan\u00e8te, mais aussi donner des informations importantes sur sa composition atmosph\u00e9rique et ses conditions de surface. \u00abCette exoplan\u00e8te sera l\u2019une des plus \u00e9tudi\u00e9es durant plusieurs d\u00e9cennies\u00bb, a estim\u00e9 Fatemeh Motalebi, de l\u2019Observatoire de l\u2019universit\u00e9 de Gen\u00e8ve, en Suisse.<\/p>\n<p>HD 219134b est situ\u00e9e dans la constellation de Cassiop\u00e9e, proche de l\u2019\u00e9toile polaire. Si la plan\u00e8te elle-m\u00eame ne peut pas \u00eatre vue, m\u00eame avec les t\u00e9lescopes spatiaux, son \u00e9toile est visible \u00e0 l\u2019\u0153il nu par ciel bien noir pr\u00e8s d\u2019une des extr\u00e9mit\u00e9s du \u00abW\u00bb de Cassiop\u00e9e. Seules 12 exoplan\u00e8tes sont situ\u00e9es plus pr\u00e8s qu\u2019elles de la Terre, mais aucune d\u2019elles ne \u00abtransite\u00bb.<\/p>\n<p>source : <a href=\"http:\/\/www.lemonde.fr\/\" target=\"_blank\">lemonde.fr<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"7910\">(418)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Des astronomes ont d\u00e9couvert la plan\u00e8te tellurique la plus proche connue en dehors de notre syst\u00e8me solaire, a confirm\u00e9 jeudi&#8230;<\/p>\n","protected":false},"author":1,"featured_media":7911,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[22],"tags":[359,4621,4619,121,363,4620],"class_list":["post-7910","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-exoplanete","tag-hd-29914b","tag-hors","tag-planete","tag-systeme-solaire","tag-transite","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/exoplanete-HD219134b.jpg?fit=620%2C349&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-23A","jetpack-related-posts":[{"id":27692,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-planete-proche-presentant-de-profondes-similitudes-avec-la-terre\/","url_meta":{"origin":7910,"position":0},"title":"D\u00e9couverte d&rsquo;une plan\u00e8te proche pr\u00e9sentant de profondes similitudes avec la Terre","author":"Admin","date":"9 f\u00e9vrier 2026","format":false,"excerpt":"Des astronomes ont d\u00e9couvert ce qui semble \u00eatre une exoplan\u00e8te qui pourrait \u00eatre un paradis terrestre lointain. Ou bien un royaume glacial, encore plus froid que Mars, incapable d'abriter la vie. Les marges d'erreur sont infimes lorsqu'il s'agit d'\u00e9tudier des plan\u00e8tes extrasolaires. Mais cette nouvelle plan\u00e8te candidate, baptis\u00e9e HD 137010\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/02\/exoplanete.webp?fit=1152%2C604&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/02\/exoplanete.webp?fit=1152%2C604&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/02\/exoplanete.webp?fit=1152%2C604&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/02\/exoplanete.webp?fit=1152%2C604&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/02\/exoplanete.webp?fit=1152%2C604&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":26581,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-decouverte-dune-superterre-revele-une-exoplanete-potentiellement-capable-dabriter-la-vie\/","url_meta":{"origin":7910,"position":1},"title":"La d\u00e9couverte d&rsquo;une superterre r\u00e9v\u00e8le une exoplan\u00e8te potentiellement capable d&rsquo;abriter la vie","author":"Admin","date":"1 f\u00e9vrier 2025","format":false,"excerpt":"Trente ans apr\u00e8s la d\u00e9couverte de la premi\u00e8re exoplan\u00e8te, les astronomes en ont d\u00e9tect\u00e9 plus de 7 000 dans notre galaxie. Mais il en reste encore des milliards \u00e0 d\u00e9couvrir. Parall\u00e8lement, les exoplan\u00e9tologues ont commenc\u00e9 \u00e0 s'int\u00e9resser \u00e0 leurs caract\u00e9ristiques, dans le but de trouver de la vie ailleurs dans\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete-HD-20794-.jpg?fit=800%2C599&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete-HD-20794-.jpg?fit=800%2C599&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete-HD-20794-.jpg?fit=800%2C599&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete-HD-20794-.jpg?fit=800%2C599&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":23937,"url":"https:\/\/www.laterredufutur.com\/accueil\/nous-venons-de-depasser-le-seuil-de-5000-exoplanetes-decouvertes\/","url_meta":{"origin":7910,"position":2},"title":"Nous venons de d\u00e9passer le seuil de 5000 exoplan\u00e8tes d\u00e9couvertes","author":"Admin","date":"7 avril 2022","format":false,"excerpt":"Le nombre d'exoplan\u00e8tes confirm\u00e9es vient de d\u00e9passer la barre des 5 000, ce qui repr\u00e9sente un voyage de d\u00e9couverte de 30 ans men\u00e9 par les t\u00e9lescopes spatiaux de la NASA, des t\u00e9lescopes terrestres et des t\u00e9lescopes spatiaux. La premi\u00e8re exoplan\u00e8te fut d\u00e9couverte le 6 octobre 1995 par Christophe Colomb avec\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/exoplanetes-decouvertes.jpg?fit=1200%2C600&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/exoplanetes-decouvertes.jpg?fit=1200%2C600&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/exoplanetes-decouvertes.jpg?fit=1200%2C600&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/exoplanetes-decouvertes.jpg?fit=1200%2C600&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/exoplanetes-decouvertes.jpg?fit=1200%2C600&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25919,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-monde-potentiellement-habitable-de-la-taille-de-la-terre-decouvert-a-40-annees-lumiere\/","url_meta":{"origin":7910,"position":3},"title":"Un monde potentiellement habitable de la taille de la Terre d\u00e9couvert \u00e0 40 ann\u00e9es-lumi\u00e8re","author":"Admin","date":"27 mai 2024","format":false,"excerpt":"Une plan\u00e8te qui ressemble \u00e0 s'y m\u00e9prendre \u00e0 la Terre vient d'\u00eatre d\u00e9couverte en orbite autour d'une \u00e9toile situ\u00e9e \u00e0 seulement 40 ann\u00e9es-lumi\u00e8re du syst\u00e8me solaire. Cette exoplan\u00e8te a un rayon tr\u00e8s similaire \u00e0 celui de notre plan\u00e8te, ce qui laisse supposer une composition rocheuse similaire. Il est int\u00e9ressant de\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/Gliese-12-exoplanete.jpg?fit=642%2C361&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/Gliese-12-exoplanete.jpg?fit=642%2C361&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/Gliese-12-exoplanete.jpg?fit=642%2C361&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":2099,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-planete-habitable-proche-de-la-terre\/","url_meta":{"origin":7910,"position":4},"title":"D\u00e9couverte d&rsquo;une plan\u00e8te habitable proche de la Terre","author":"Admin","date":"1 juillet 2014","format":false,"excerpt":"A 16,1 ann\u00e9es-lumi\u00e8re, Gliese 832c serait l'exoplan\u00e8te habitable la plus proche de la Terre. Selon l'astronome co-auteur de la d\u00e9couverte, \"il peut \u00eatre possible pour la vie de survivre\" sur cette plan\u00e8te, mais avec des changements saisonniers extr\u00eames. Un mois apr\u00e8s la d\u00e9couverte de l'\u00e9toile de Kapteyn, c'est au tour\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2014\/07\/laterredufutur.com_photos_Gliese-832c-1.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1886,"url":"https:\/\/www.laterredufutur.com\/accueil\/aurait-on-decouvert-la-premiere-planete-habitable\/","url_meta":{"origin":7910,"position":5},"title":"D\u00e9couverte de la premi\u00e8re exoplan\u00e8te habitable de m\u00eame taille que la Terre","author":"Admin","date":"27 mars 2014","format":false,"excerpt":"NASA : d\u00e9couverte de la premi\u00e8re exoplan\u00e8te d'une taille similaire \u00e0 la Terre dans une zone habitable.\u00a0La d\u00e9couverte excite la communaut\u00e9 scientifique depuis quelques jours : une \u00e9quipe d'astronomes a identifi\u00e9 la premi\u00e8re exoplan\u00e8te d'une taille similaire \u00e0 la Terre situ\u00e9e dans la zone habitable de son \u00e9toile. Les scientifiques\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/7910","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=7910"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/7910\/revisions"}],"predecessor-version":[{"id":7912,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/7910\/revisions\/7912"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/7911"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=7910"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=7910"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=7910"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}