{"id":28065,"date":"2026-04-30T12:00:13","date_gmt":"2026-04-30T10:00:13","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=28065"},"modified":"2026-04-18T15:22:45","modified_gmt":"2026-04-18T13:22:45","slug":"planete-neuf-lenigme-qui-redessine-les-frontieres-du-systeme-solaire","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/planete-neuf-lenigme-qui-redessine-les-frontieres-du-systeme-solaire\/","title":{"rendered":"Plan\u00e8te Neuf : l\u2019\u00e9nigme qui redessine les fronti\u00e8res du syst\u00e8me solaire"},"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>Depuis pr\u00e8s d\u2019une d\u00e9cennie, la Plan\u00e8te Neuf (ou Planet Nine) s\u2019impose comme l\u2019un des sujets les plus fascinants et d\u00e9battus de l\u2019astronomie moderne. Invisible mais potentiellement massive, elle serait cach\u00e9e dans les r\u00e9gions les plus recul\u00e9es du syst\u00e8me solaire, bien au-del\u00e0 de Neptune.<br \/>\nMais que sait-on vraiment aujourd\u2019hui, en 2026 ? Entre avanc\u00e9es observationnelles, simulations num\u00e9riques et controverses scientifiques, voici un \u00e9tat des lieux complet.<\/p>\n<ul>\n<li><strong>&nbsp;1. Origine de l\u2019hypoth\u00e8se : une signature gravitationnelle.<\/strong><\/li>\n<\/ul>\n<p>L\u2019histoire commence s\u00e9rieusement en 2016 lorsque Konstantin Batygin et Mike Brown (du California Institute of Technology) publient une \u00e9tude marquante.<br \/>\nIls observent que plusieurs objets extr\u00eamement \u00e9loign\u00e9s \u2014 les objets transneptuniens extr\u00eames \u2014 pr\u00e9sentent :<br \/>\ndes orbites anormalement align\u00e9es, des inclinaisons similaires, des distances au Soleil tr\u00e8s \u00e9lev\u00e9es (plusieurs centaines d\u2019unit\u00e9s astronomiques)<br \/>\n&nbsp; &nbsp;&#8211;&nbsp; Statistiquement, cette organisation est tr\u00e8s improbable sans une cause externe.<br \/>\n&nbsp; &nbsp;&#8211;&nbsp; Leur conclusion : une plan\u00e8te massive invisible exercerait une influence gravitationnelle \u00e0 grande distance.<\/p>\n<ul>\n<li><strong>2. Portrait-robot de la Plan\u00e8te Neuf<\/strong><\/li>\n<\/ul>\n<p>Les mod\u00e8les ont \u00e9t\u00e9 affin\u00e9s depuis 2016. Aujourd\u2019hui, le profil le plus probable serait :<br \/>\n&nbsp;&#8211;&nbsp; Masse : 5 \u00e0 10 fois celle de la Terre<br \/>\n&nbsp;&#8211;&nbsp; Type : g\u00e9ante glac\u00e9e (analogue \u00e0 Uranus ou Neptune)<br \/>\n&nbsp;&#8211;&nbsp; Distance moyenne : 400 \u00e0 800 UA (voire plus dans certains mod\u00e8les r\u00e9cents)<br \/>\n&nbsp;&#8211;&nbsp; Orbite : tr\u00e8s elliptique et inclin\u00e9e<br \/>\n&nbsp;&#8211;&nbsp; P\u00e9riode orbitale : 10 000 \u00e0 20 000 ans<br \/>\n&nbsp;&#8211;&nbsp; \u00c0 titre de comparaison, Pluton orbite \u00e0 seulement ~39 UA.<br \/>\n&nbsp;&#8211;&nbsp; R\u00e9sultat : une plan\u00e8te quasi invisible, recevant tr\u00e8s peu de lumi\u00e8re solaire.<\/p>\n<ul>\n<li><strong>&nbsp;3. Ce que disent les simulations modernes<\/strong><\/li>\n<\/ul>\n<p>Les simulations num\u00e9riques sont aujourd\u2019hui le c\u0153ur du d\u00e9bat. Elles montrent que la pr\u00e9sence d\u2019une plan\u00e8te massive permettrait d\u2019expliquer :<br \/>\n&#8211;&nbsp; l\u2019alignement des orbites extr\u00eames<br \/>\n&#8211;&nbsp; l\u2019existence d\u2019objets tr\u00e8s inclin\u00e9s (voire r\u00e9trogrades)<br \/>\n&#8211;&nbsp; des objets \u201cd\u00e9croch\u00e9s\u201d gravitationnellement du reste du syst\u00e8me solaire<br \/>\nCertains mod\u00e8les sugg\u00e8rent m\u00eame que la Plan\u00e8te Neuf pourrait :<br \/>\n&#8211;&nbsp; \u00eatre responsable de la structure globale de la ceinture de Kuiper<br \/>\n&#8211;&nbsp; influencer la distribution du nuage de Oort interne<\/p>\n<ul>\n<li><strong>&nbsp;4. Les recherches observationnelles (2016\u20132026<\/strong><\/li>\n<\/ul>\n<p>&nbsp;&#8211;&nbsp; T\u00e9lescopes et campagnes<\/p>\n<p>Depuis 2016, plusieurs instruments ont \u00e9t\u00e9 mobilis\u00e9s : des t\u00e9lescopes optiques terrestres, des relev\u00e9s infrarouges, e des archives de missions spatiales. Malgr\u00e9 cela, aucune d\u00e9tection directe confirm\u00e9e.<\/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<ul>\n<li><strong>&nbsp;Les avanc\u00e9es r\u00e9centes<\/strong><\/li>\n<\/ul>\n<ol>\n<li>R\u00e9duction des zones de recherche<br \/>\nLes astronomes ont progressivement \u00e9limin\u00e9 certaines r\u00e9gions du ciel, affinant la zone probable o\u00f9 se cacherait la plan\u00e8te.<\/li>\n<li>\n<p>Contraintes plus strictes sur la masse et la distance<br \/>\nLes donn\u00e9es r\u00e9centes sugg\u00e8rent que : la plan\u00e8te pourrait \u00eatre plus \u00e9loign\u00e9e que pr\u00e9vu ou moins lumineuse, donc plus difficile \u00e0 d\u00e9tecter<\/p>\n<\/li>\n<li>Nouveaux objets transneptuniens<br \/>\nChaque nouvelle d\u00e9couverte d\u2019objet lointain apporte des indices : certains confirment les alignements d\u2019autres introduisent des incoh\u00e9rences.&nbsp;Ce qui alimente le d\u00e9bat scientifique.<\/li>\n<\/ol>\n<ul>\n<li>L\u2019espoir : Observatoire Vera C. Rubin<br \/>\nCe futur observatoire (LSST) est consid\u00e9r\u00e9 comme un game changer : balayage complet du ciel austral, d\u00e9tection d\u2019objets tr\u00e8s faibles, suivi des mouvements lents.<\/li>\n<li>Il pourrait confirmer ou r\u00e9futer d\u00e9finitivement l\u2019existence de la Plan\u00e8te Neuf dans la prochaine d\u00e9cennie.<\/li>\n<\/ul>\n<ul>\n<li><strong>5. Les alternatives \u00e0 la Plan\u00e8te Neuf<\/strong><\/li>\n<\/ul>\n<p>Tous les scientifiques ne sont pas convaincus.<br \/>\n&#8211; Hypoth\u00e8ses concurrentes :<br \/>\n1. Biais observationnel<br \/>\n&#8211; On ne verrait que certains objets parce que ce sont les plus faciles \u00e0 d\u00e9tecter.<br \/>\n2. Interaction collective<br \/>\n&#8211; Les objets eux-m\u00eames pourraient s\u2019influencer gravitationnellement.<br \/>\n3. Vestige d\u2019un amas stellaire<br \/>\n&#8211; Le Soleil aurait captur\u00e9 ou influenc\u00e9 ces objets lors de sa naissance dans un amas dense.<br \/>\n4. Trou noir primordial (hypoth\u00e8se marginale)<br \/>\nCertains ont m\u00eame propos\u00e9 un micro trou noir \u00e0 la place d\u2019une plan\u00e8te !<br \/>\n&#8211; Mais cette id\u00e9e reste tr\u00e8s sp\u00e9culative.<\/p>\n<ul>\n<li><strong>6. Origine possible de la Plan\u00e8te Neuf<\/strong><\/li>\n<\/ul>\n<p>Si elle existe, plusieurs sc\u00e9narios sont envisag\u00e9s :<br \/>\n&#8211; Plan\u00e8te \u00e9ject\u00e9e partiellement lors de la formation du syst\u00e8me solaire<br \/>\n&#8211; Capture gravitationnelle d\u2019une plan\u00e8te d\u2019une autre \u00e9toile<br \/>\n&#8211; Formation locale dans un disque protoplan\u00e9taire \u00e9tendu<br \/>\n&#8211; Aucun sc\u00e9nario n\u2019est encore confirm\u00e9.<\/p>\n<ul>\n<li><strong>7. Pourquoi c\u2019est une d\u00e9couverte majeure<\/strong><\/li>\n<\/ul>\n<p>Confirmer la Plan\u00e8te Neuf aurait des cons\u00e9quences \u00e9normes :<br \/>\n&#8211; r\u00e9vision des mod\u00e8les de formation plan\u00e9taire<br \/>\n&#8211; meilleure compr\u00e9hension de notre syst\u00e8me solaire<br \/>\n&#8211; implications pour la recherche d\u2019exoplan\u00e8tes<br \/>\n&#8211; Cela montrerait que notre syst\u00e8me solaire est plus complexe et dynamique qu\u2019on ne le pensait.<\/p>\n<ul>\n<li><strong>Conclusion : une fronti\u00e8re encore ouverte<\/strong><\/li>\n<\/ul>\n<p>La Plan\u00e8te Neuf est aujourd\u2019hui un myst\u00e8re scientifique actif, \u00e0 la fronti\u00e8re entre observation et th\u00e9orie.<br \/>\n&#8211; Les indices sont s\u00e9rieux<br \/>\n&#8211; La preuve directe manque<br \/>\n&#8211; Les prochaines ann\u00e9es seront d\u00e9cisives<br \/>\n&#8211; On pourrait \u00eatre \u00e0 l\u2019aube d\u2019une d\u00e9couverte historique\u2026 ou d\u2019une remise en question profonde de nos m\u00e9thodes d\u2019observation.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"28066\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/planete-neuf-lenigme-qui-redessine-les-frontieres-du-systeme-solaire\/planete-9-ou-planete-x\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?fit=1024%2C1536&amp;ssl=1\" data-orig-size=\"1024,1536\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"planete 9 ou planete X\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?fit=533%2C800&amp;ssl=1\" class=\"aligncenter wp-image-28066 size-full\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=1024%2C1536&#038;ssl=1\" alt=\"\" width=\"1024\" height=\"1536\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?w=1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=533%2C800&amp;ssl=1 533w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=40%2C60&amp;ssl=1 40w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=928%2C1392&amp;ssl=1 928w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X.jpg?resize=480%2C720&amp;ssl=1 480w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\">Terra Projects<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"28065\">(18)<\/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>Depuis pr\u00e8s d\u2019une d\u00e9cennie, la Plan\u00e8te Neuf (ou Planet Nine) s\u2019impose comme l\u2019un des sujets les plus fascinants et d\u00e9battus&#8230;<\/p>\n","protected":false},"author":1,"featured_media":28067,"comment_status":"closed","ping_status":"closed","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_post_was_ever_published":false,"_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}},"categories":[22],"tags":[8330,7263,2570,363],"class_list":["post-28065","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-enigme","tag-planete-9","tag-planete-x","tag-systeme-solaire","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2026\/04\/planete-9-ou-planete-X-1.jpg?fit=1024%2C1536&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-7iF","jetpack-related-posts":[{"id":22861,"url":"https:\/\/www.laterredufutur.com\/accueil\/quest-ce-que-la-planete-neuf-planete-x-et-existe-t-elle\/","url_meta":{"origin":28065,"position":0},"title":"Qu&rsquo;est-ce que la plan\u00e8te neuf (plan\u00e8te X) et existe-t-elle ?","author":"Admin","date":"3 ao\u00fbt 2021","format":false,"excerpt":"La Plan\u00e8te Neuf - \u00e9galement appel\u00e9e Plan\u00e8te X - est un objet massif et hypoth\u00e9tique qui se trouve sur une orbite elliptique bien au-del\u00e0 de Pluton, \u00e0 une distance telle qu'il lui faudrait 10 000 \u00e0 20 000 ann\u00e9es terrestres pour faire un tour complet du Soleil. Bien qu'aucune observation\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\/2021\/08\/planete-x-planete-neuf-1.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/planete-x-planete-neuf-1.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/planete-x-planete-neuf-1.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/planete-x-planete-neuf-1.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":17136,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-nouvelle-planete-naine-dans-notre-systeme-solaire\/","url_meta":{"origin":28065,"position":1},"title":"D\u00e9couverte d\u2019une nouvelle plan\u00e8te naine dans notre syst\u00e8me solaire","author":"Admin","date":"9 novembre 2018","format":false,"excerpt":"Des scientifiques ont rep\u00e9r\u00e9, bien au-del\u00e0 de Pluton, une plan\u00e8te naine qu\u2019ils ont baptis\u00e9e \u00ab The goblin \u00bb (le gobelin). Sa d\u00e9couverte relance les th\u00e9ories sur l\u2019existence d\u2019une neuvi\u00e8me plan\u00e8te dans notre syst\u00e8me solaire. Le \u00ab gobelin \u00bb, ou 2015 TG387, est le troisi\u00e8me objet transneptunien extr\u00eame avec Sedna et\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\/2018\/11\/planet-goblin.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\/2018\/11\/planet-goblin.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/planet-goblin.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/planet-goblin.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/planet-goblin.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25141,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-planete-geante-semble-se-cacher-dans-notre-systeme-solaire\/","url_meta":{"origin":28065,"position":2},"title":"Une plan\u00e8te g\u00e9ante semble se cacher dans notre syst\u00e8me solaire","author":"Admin","date":"16 ao\u00fbt 2023","format":false,"excerpt":"Notre syst\u00e8me solaire est tr\u00e8s actif. Des millions d'objets s'y d\u00e9placent, qu'il s'agisse de plan\u00e8tes, de lunes, de com\u00e8tes ou d'ast\u00e9ro\u00efdes. Et chaque ann\u00e9e, nous d\u00e9couvrons de plus en plus d'objets (g\u00e9n\u00e9ralement de petits ast\u00e9ro\u00efdes ou des com\u00e8tes rapides) qui \u00e9lisent domicile dans le syst\u00e8me solaire. En 1846, les astronomes\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\/2018\/05\/planete-nine.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/05\/planete-nine.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/05\/planete-nine.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/05\/planete-nine.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":24759,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-planete-geante-semble-se-cacher-quelque-part-dans-notre-systeme-solaire\/","url_meta":{"origin":28065,"position":3},"title":"Une plan\u00e8te g\u00e9ante semble se cacher quelque part dans notre syst\u00e8me solaire","author":"Admin","date":"19 f\u00e9vrier 2023","format":false,"excerpt":"Notre syst\u00e8me solaire est un endroit tr\u00e8s int\u00e9ressant. Des millions d'objets s'y d\u00e9placent, des plan\u00e8tes aux lunes, en passant par les com\u00e8tes et les ast\u00e9ro\u00efdes. Et chaque ann\u00e9e, nous d\u00e9couvrons de plus en plus d'objets (g\u00e9n\u00e9ralement de petits ast\u00e9ro\u00efdes ou des com\u00e8tes rapides) qui ont \u00e9lu domicile dans le syst\u00e8me\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\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":27369,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-theorie-de-la-planete-y-suggere-lexistence-dun-monde-cache-de-la-taille-de-la-terre-dans-le-systeme-solaire-et-il-pourrait-etre-beaucoup-plus-proche-de-nous-que-la\/","url_meta":{"origin":28065,"position":4},"title":"La th\u00e9orie de la \u00ab Plan\u00e8te Y \u00bb sugg\u00e8re l&rsquo;existence d&rsquo;un monde cach\u00e9 de la taille de la Terre dans le syst\u00e8me solaire \u2014 et il pourrait \u00eatre beaucoup plus proche de nous que la \u00ab Plan\u00e8te Neuf \u00bb","author":"Admin","date":"17 octobre 2025","format":false,"excerpt":"Une nouvelle \u00e9tude a sugg\u00e9r\u00e9 l'existence de la Plan\u00e8te Y, une autre Plan\u00e8te Neuf, plus petite et plus proche de la Terre que l'hypoth\u00e9tique Plan\u00e8te X, que les astronomes traquent depuis pr\u00e8s de dix ans. Cependant, les preuves de l'existence de ce monde nouvellement th\u00e9oris\u00e9 ne sont pas d\u00e9finitives. Des\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\/2021\/09\/planete-x.jpg?fit=1024%2C576&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/09\/planete-x.jpg?fit=1024%2C576&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/09\/planete-x.jpg?fit=1024%2C576&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/09\/planete-x.jpg?fit=1024%2C576&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":23387,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-astronome-britannique-affirme-avoir-trouve-lenigmatique-planete-neuf\/","url_meta":{"origin":28065,"position":5},"title":"Un astronome britannique affirme avoir trouv\u00e9 l&rsquo;\u00e9nigmatique Plan\u00e8te Neuf","author":"Admin","date":"12 novembre 2021","format":false,"excerpt":"Londres, 12 novembre 2021. L'astronome britannique Michael Rowan-Robinson a publi\u00e9 une \u00e9tude o\u00f9 il r\u00e9v\u00e8le avoir trouv\u00e9 un nouveau candidat qui pourrait \u00eatre l'\u00e9nigmatique Plan\u00e8te Neuf propos\u00e9e par deux astronomes californiens en 2016. Des astronomes en sont convaincus : il existe une neuvi\u00e8me plan\u00e8te dans les confins du Syst\u00e8me solaire.\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\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/planete-9.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/28065","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=28065"}],"version-history":[{"count":4,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/28065\/revisions"}],"predecessor-version":[{"id":28070,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/28065\/revisions\/28070"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/28067"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=28065"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=28065"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=28065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}