{"id":13115,"date":"2024-04-27T13:52:30","date_gmt":"2024-04-27T13:52:30","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/pourquoi-pluton-a-un-coeur-geant-a-sa-surface-le-mystere-est-resolu"},"modified":"2024-04-27T15:59:11","modified_gmt":"2024-04-27T15:59:11","slug":"pourquoi-pluton-a-un-coeur-geant-a-sa-surface-le-mystere-est-resolu","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/pourquoi-pluton-a-un-coeur-geant-a-sa-surface-le-mystere-est-resolu","title":{"rendered":"Pourquoi Pluton a un c\u0153ur g\u00e9ant \u00e0 sa surface ? Le myst\u00e8re est r\u00e9solu"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>La sonde New Horizons a de\u0301voile\u0301 une histoire de c\u0153ur… Lors de son passage en 2015, au-dessus de la plane\u0300te de\u0301chue, l\u2019engin a en effet photographie\u0301 une vaste plaine, en forme de c\u0153ur qui, avec un albe\u0301do e\u0301leve\u0301, e\u0301tait particulie\u0300rement visible sur les images. La zone a e\u0301te\u0301 baptise\u0301e re\u0301gion Tombaugh \u2013 du nom de Clyde Tombaugh, de\u0301couvreur de la plane\u0300te naine en 1930. Tandis que la plaine Spoutnik (Sputnik Planitia) forme la partie gauche de l\u2019organe.<\/p>\n

Une re\u0301gion myste\u0301rieuse<\/b><\/p>\n

La plaine Spoutnik est recouverte d\u2019un e\u0301norme glacier de quatre kilome\u0300tres de profondeur et de mille de large, compose\u0301 principalement de glace d\u2019azote avec un soupc\u0327on de glace de monoxyde de carbone et de me\u0301thane. Les scientifiques suspectent depuis longtemps qu\u2019elle repre\u0301sente un ancien crate\u0300re d\u2019impact.<\/p>\n

Une e\u0301quipe de l\u2019Universite\u0301 de Berne et de l\u2019Universite\u0301 de Tucson, aux Etats-Unis, a explore\u0301 ce sce\u0301nario et re\u0301alise\u0301 des simulations nume\u0301riques pour tenter de comprendre comment cette re\u0301gion a pu prendre cet aspect presque immacule\u0301. Leur e\u0301tude, publie\u0301e dans la revue Nature Astronomy, indique que Pluton a e\u0301te\u0301 frappe\u0301, to\u0302t dans son histoire, par un impacteur de 730 km de diame\u0300tre compose\u0301 essentiellement de glace et de 30% de roches ayant une trajectoire oblique et qui e\u0301voluait a\u0300 faible vitesse, de l\u2019ordre de 6 kilome\u0300tres par seconde (Km\/s).<\/p>\n

\u201cLe noyau de Pluton est si froid que les roches sont reste\u0301es tre\u0300s dures et n\u2019ont pas fondu malgre\u0301 la chaleur de l\u2019impact. Gra\u0302ce a\u0300 l\u2019angle d\u2019impact et a\u0300 la faible vitesse, le noyau de l\u2019impacteur ne s\u2019est pas enfonce\u0301 dans le noyau de Pluton, mais est reste\u0301 intact comme un monticule ou un amoncellement sur celui-ci\u201d, explique dans un communique\u0301 de l\u2019Universite\u0301 de Berne, Harry Ballantyne, principal auteur de l\u2019article. \u201cQuelque part sous Sputnik Planitia se trouve ainsi le noyau re\u0301siduel d\u2019un autre corps massif, que Pluton n\u2019a jamais vraiment dige\u0301re\u0301\u201d, ajoute le professeur Erik Asphaug, un de ses co-auteurs.<\/p>\n


\nPeut-e\u0302tre pas d\u2019oce\u0301an sous la surface de Pluton<\/b><\/p>\n

Les plane\u0301tologues sugge\u0300rent e\u0301galement depuis l\u2019examen des cliche\u0301s de la sonde New Horizons (dont la mission se prolonge aux confins du syste\u0300me solaire) qu\u2019un oce\u0301an de subsurface pourrait subsister dans certaines re\u0301gions de Pluton et notamment sous la plaine Spoutnik.<\/p>\n

C\u2019est l\u2019une des raisons qui expliquerait sa position e\u0301quatoriale: en effet, une de\u0301pression ge\u0301ante comme la plaine Spoutnik devrait se de\u0301placer lentement vers le po\u0302le de la plane\u0300te naine au fil du temps, en raison des lois de la physique, puisqu\u2019elle pre\u0301sente un de\u0301ficit de masse.<\/p>\n

L\u2019ide\u0301e e\u0301tait donc que sous la crou\u0302te plus fine du c\u0153ur, l\u2019oce\u0301an serait plus volumineux, renfle\u0301 en quelque sorte. Or l\u2019eau e\u0301tant plus dense que la glace, ce surplus de masse induirait une migration de la re\u0301gion vers l\u2019e\u0301quateur comme cela est observe\u0301 actuellement. Ne\u0301anmoins, si le noyau de l\u2019impacteur est effectivement pre\u0301sent sous la plaine Spoutnik, il peut a\u0300 lui seul ge\u0301ne\u0301rer \u201cun exce\u0300s de masse local qui peut expliquer la migration vers l\u2019e\u0301quateur sans la ne\u0301cessite\u0301 d\u2019un oce\u0301an sous la surface, ou tout au plus un oce\u0301an peu profond\u201d, indiquent les chercheurs.<\/p>\n

 <\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. La sonde New Horizons a de\u0301voile\u0301 une histoire de c\u0153ur… Lors de son passage en 2015, au-dessus de la plane\u0300te de\u0301chue, l\u2019engin a en effet photographie\u0301 une vaste plaine, en forme de c\u0153ur qui, avec un albe\u0301do e\u0301leve\u0301, e\u0301tait particulie\u0300rement visible sur les images. La zone a e\u0301te\u0301 baptise\u0301e […]<\/p>\n","protected":false},"author":82,"featured_media":13114,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-13115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nPourquoi Pluton a un c\u0153ur g\u00e9ant \u00e0 sa surface ? 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