{"id":16511,"date":"2018-04-14T20:00:23","date_gmt":"2018-04-14T18:00:23","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=16511"},"modified":"2018-04-08T20:39:10","modified_gmt":"2018-04-08T18:39:10","slug":"decouverte-dune-planete-entierement-metallique-de-la-taille-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-planete-entierement-metallique-de-la-taille-de-la-terre\/","title":{"rendered":"D\u00e9couverte d\u2019une plan\u00e8te enti\u00e8rement m\u00e9tallique de la taille 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>La chasse aux exoplan\u00e8tes r\u00e9serve bien des surprises et l\u2019on d\u00e9couvre des mondes bien diff\u00e9rents les uns des autres. Un nouvel article scientifique publi\u00e9 dans la revue Nature du 6 mars 2018, relay\u00e9 par le site \u00e7a se passe l\u00e0-haut, l\u2019illustre bien. Alexandre Santerne (Laboratoire d\u2019Astrophysique de Marseille, Aix-Marseille Universit\u00e9) et ses collaborateurs ont d\u00e9couvert une plan\u00e8te enti\u00e8rement m\u00e9tallique de la taille de la Terre. Extrait: K2-229b est une des trois plan\u00e8tes qui ont \u00e9t\u00e9 d\u00e9couvertes en orbite autour de l\u2019\u00e9toile naine K2-229. Cette plan\u00e8te est surprenante : de la taille de la Terre, elle poss\u00e8de une densit\u00e9 bien sup\u00e9rieure \u00e0 celle de Mercure, montrant qu\u2019elle serait enti\u00e8rement m\u00e9tallique.<\/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><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/v980hx9m8U8?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p>source : <a href=\"https:\/\/www.agences-spatiales.fr\/planete-entierement-metallique\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.agences-spatiales.fr<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"16511\">(890)<\/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>La chasse aux exoplan\u00e8tes r\u00e9serve bien des surprises et l\u2019on d\u00e9couvre des mondes bien diff\u00e9rents les uns des autres. Un&#8230;<\/p>\n","protected":false},"author":1,"featured_media":16512,"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":"D\u00e9couverte d\u2019une plan\u00e8te enti\u00e8rement m\u00e9tallique de la taille de la Terre @laterredufutur","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":[359,6662,6661,121,684],"class_list":["post-16511","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-exoplanete","tag-k2-229b","tag-metallique","tag-planete","tag-video","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/04\/K2-229b-planete.jpg?fit=970%2C545&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4ij","jetpack-related-posts":[{"id":26520,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-nasa-a-decouvert-une-planete-plus-imposante-que-la-terre-avec-un-gaz-qui-nest-produit-que-par-la-vie\/","url_meta":{"origin":16511,"position":0},"title":"La NASA a d\u00e9couvert une plan\u00e8te plus imposante que la Terre avec un gaz qui n&rsquo;est produit que par la vie","author":"Admin","date":"10 janvier 2025","format":false,"excerpt":"La NASA a d\u00e9couvert une plan\u00e8te plus grande que la Terre, accompagn\u00e9e d'un gaz \u00ab uniquement produit par la vie \u00bb. Alors que l'agence spatiale continue de faire d'incroyables d\u00e9couvertes dans notre syst\u00e8me solaire, l'une d'entre elles, datant de 2023, est toujours aussi impressionnante. Cette d\u00e9couverte a \u00e9t\u00e9 r\u00e9alis\u00e9e gr\u00e2ce\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.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25354,"url":"https:\/\/www.laterredufutur.com\/accueil\/y-a-t-il-de-la-vie-sur-la-superterre-k2-18-b-de-leau-decouverte-dans-son-atmosphere\/","url_meta":{"origin":16511,"position":1},"title":"Y a-t-il de la vie sur la superterre K2-18 b ? De l&rsquo;eau d\u00e9couverte dans son atmosph\u00e8re !","author":"Admin","date":"10 novembre 2023","format":false,"excerpt":"De la vapeur d'eau a \u00e9t\u00e9 d\u00e9couverte dans l'atmosph\u00e8re d'une exoplan\u00e8te super-Terre, K2-18 b, qui orbite dans la zone habitable de son \u00e9toile. La temp\u00e9rature de la plan\u00e8te est similaire \u00e0 celle de la Terre, ce qui en fait un candidat prometteur pour des \u00e9tudes plus approfondies. K2-18 b a\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\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25249,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-decouvre-du-methane-et-du-dioxyde-de-carbone-dans-latmosphere-de-k2-18-b\/","url_meta":{"origin":16511,"position":2},"title":"Le t\u00e9lescope James Webb d\u00e9couvre du m\u00e9thane et du dioxyde de carbone dans l&rsquo;atmosph\u00e8re de K2-18 b","author":"Admin","date":"27 septembre 2023","format":false,"excerpt":"Une nouvelle observation de K2-18 b, une exoplan\u00e8te 8,6 fois plus massive que la Terre, par le t\u00e9lescope spatial James Webb de la NASA a r\u00e9v\u00e9l\u00e9 la pr\u00e9sence de mol\u00e9cules contenant du carbone, notamment du m\u00e9thane et du dioxyde de carbone. La d\u00e9couverte de M. Webb vient s'ajouter \u00e0 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\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25867,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-webb-decouvre-une-nouvelle-exoplanete-potentiellement-habitable-k2-18b\/","url_meta":{"origin":16511,"position":3},"title":"Le t\u00e9lescope Webb d\u00e9couvre une nouvelle exoplan\u00e8te potentiellement habitable K2-18b","author":"Admin","date":"15 mai 2024","format":false,"excerpt":"Des rapports r\u00e9cents de la NASA, c'est le T\u00e9lescope spatial James Webb qui aurait trouv\u00e9 des signes de vie sur une plan\u00e8te lointaine, et cela a naturellement suscit\u00e9 l\u2019enthousiasme. Cependant, une nouvelle \u00e9tude remet en question cette d\u00e9couverte, mais explique \u00e9galement comment le t\u00e9lescope pourrait v\u00e9rifier la pr\u00e9sence du gaz\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\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":26843,"url":"https:\/\/www.laterredufutur.com\/accueil\/james-webb-capte-une-trace-de-vie-sur-lexoplanete-k2-18b\/","url_meta":{"origin":16511,"position":4},"title":"James Webb capte une trace de vie sur l&rsquo;exoplan\u00e8te K2-18b","author":"Admin","date":"22 avril 2025","format":false,"excerpt":"Des mol\u00e9cules consid\u00e9r\u00e9es comme des signatures potentielles de la vie ont \u00e9t\u00e9 d\u00e9tect\u00e9es dans l\u2019atmosph\u00e8re de K2-18b, un exoplan\u00e8te situ\u00e9e \u00e0 124 ann\u00e9es-lumi\u00e8re. Une avanc\u00e9e majeure qui ravive s\u00e9rieusement la question de la vie ailleurs dans l\u2019Univers. L\u2019espoir d\u2019un jour prouver que nous ne sommes pas seuls dans l\u2019univers vient\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\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":19689,"url":"https:\/\/www.laterredufutur.com\/accueil\/de-la-decouverte-de-leau-autour-dune-exoplanete-potentiellement-habitable-a-la-declaration-de-la-navy-sur-les-ovnis\/","url_meta":{"origin":16511,"position":5},"title":"De la d\u00e9couverte de l&rsquo;eau autour d&rsquo;une exoplan\u00e8te potentiellement habitable, \u00e0 la d\u00e9claration de la Navy sur les Ovnis","author":"Admin","date":"21 septembre 2019","format":false,"excerpt":"Situ\u00e9e \u00e0 plus d\u2019un million de milliards de kilom\u00e8tres de la Terre, cette plan\u00e8te est la \u00abmeilleur candidate\u00bb pour la recherche de signes de vie extraterrestre. De cette perle rare, \u00absuper int\u00e9ressante\u00bb, les astronomes savent encore peu de choses. Mais ce qu\u2019ils ont d\u00e9couvert est tr\u00e8s prometteur, et propulse cette\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\/2019\/03\/exoplanete-mondes-habitables.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/exoplanete-mondes-habitables.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/exoplanete-mondes-habitables.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/exoplanete-mondes-habitables.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/exoplanete-mondes-habitables.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16511","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=16511"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16511\/revisions"}],"predecessor-version":[{"id":16513,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16511\/revisions\/16513"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/16512"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=16511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=16511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=16511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}