{"id":20204,"date":"2023-10-12T19:03:38","date_gmt":"2023-10-12T19:03:38","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/les-premieres-images-du-plus-gros-echantillon-dasteroide-jamais-collecte-devoilees-par-la-nasa"},"modified":"2023-10-12T20:17:16","modified_gmt":"2023-10-12T20:17:16","slug":"les-premieres-images-du-plus-gros-echantillon-dasteroide-jamais-collecte-devoilees-par-la-nasa","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/les-premieres-images-du-plus-gros-echantillon-dasteroide-jamais-collecte-devoilees-par-la-nasa","title":{"rendered":"Les premi\u00e8res images du plus gros \u00e9chantillon d\u2019ast\u00e9ro\u00efde jamais collect\u00e9 d\u00e9voil\u00e9es par la Nasa"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>La Nasa tient mercredi un e\u0301ve\u0301nement public puis une confe\u0301rence de presse pour pre\u0301senter les premie\u0300res images de l\u2019e\u0301chantillon d\u2019aste\u0301roi\u0308de recueilli par la sonde Osiris-Rex, le plus gros jamais collecte\u0301 dans l\u2019espace.<\/p>\n<p>L\u2019e\u0301ve\u0301nement devrait ravir tous les passionne\u0301s d\u2019espace : la Nasa doit re\u0301ve\u0301ler, mercredi 11 octobre, les premie\u0300res images du plus gros e\u0301chantillon d\u2019aste\u0301roi\u0308de jamais collecte\u0301 dans l\u2019espace, ainsi que les premie\u0300res analyses sur sa composition, attendues avec impatience par des scientifiques du monde entier.<\/p>\n<p>La mission Osiris-Rex avait pre\u0301leve\u0301 cet e\u0301chantillon en 2020 sur l\u2019aste\u0301roi\u0308de Bennu, et la capsule contenant la pre\u0301cieuse cargaison est revenue avec succe\u0300s sur Terre il y a un peu plus de deux semaines, atterrissant dans le de\u0301sert ame\u0301ricain.<\/p>\n<p>Depuis, le me\u0301ticuleux processus d\u2019ouverture de la capsule se de\u0301roule dans une chambre blanche au centre spatial Johnson de la Nasa a\u0300 Houston. Et l\u2019ope\u0301ration a de\u0301ja\u0300 re\u0301serve\u0301 quelques surprises.<\/p>\n<p>\u201cIl y a tellement de matie\u0300re que cela nous prend davantage de temps que pre\u0301vu pour la re\u0301cupe\u0301rer\u201d, a de\u0301clare\u0301 Christopher Snead, scientifique a\u0300 la Nasa. Mais il s\u2019agit la\u0300 du \u201cmeilleur proble\u0300me qu\u2019on puisse avoir\u201d, a-t-il ajoute\u0301 dans un communique\u0301.<\/p>\n<p>Avant l\u2019atterrissage de la capsule, l\u2019agence spatiale ame\u0301ricaine estimait avoir re\u0301ussi a\u0300 ramasser environ 250 grammes de matie\u0300re sur l\u2019aste\u0301roi\u0308de Bennu \u2013 soit bien plus que deux pre\u0301ce\u0301dentes missions japonaises vers d\u2019autres aste\u0301roi\u0308des.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" class=\"alignnone wp-image-20201 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125543.098087.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125543.098087.jpg 1536w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125543.098087-300x200.jpg 300w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125543.098087-1024x683.jpg 1024w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125543.098087-768x512.jpg 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/p>\n<p>La Nasa, pour qui une telle man\u0153uvre e\u0301tait une premie\u0300re, devra confirmer cette estimation mercredi lors d\u2019un e\u0301ve\u0301nement public, puis une confe\u0301rence de presse. Mais les e\u0301chos sont jusqu\u2019a\u0300 pre\u0301sent on ne peut plus positifs. De la matie\u0300re a e\u0301te\u0301 retrouve\u0301e \u201cen abondance\u201d a\u0300 l\u2019exte\u0301rieur me\u0302me du compartiment de collecte, a explique\u0301 Christopher Snead. \u201cC\u2019est vraiment spectaculaire.\u201d<\/p>\n<p><b>\u201cPoussie\u0300re noire\u201d<\/b><\/p>\n<p>L\u2019heureuse surprise s\u2019explique par un incident survenu au moment du pre\u0301le\u0300vement de l\u2019e\u0301chantillon : juste apre\u0300s l\u2019ope\u0301ration, la Nasa s\u2019e\u0301tait rendu compte que le clapet du compartiment de collecte ne parvenait pas a\u0300 se refermer.<\/p>\n<p>La cargaison avait re\u0301ussi a\u0300 e\u0302tre se\u0301curise\u0301e en e\u0301tant transfe\u0301re\u0301e comme pre\u0301vu jusque dans la capsule, mais a\u0300 cause de cette fuite, les scientifiques s\u2019attendaient a\u0300 ce que des re\u0301sidus soient retrouve\u0301s a\u0300 l\u2019exte\u0301rieur du compartiment, dans la boi\u0302te ou\u0300 il avait e\u0301te\u0301 place\u0301.<\/p>\n<p>Cette \u201cpoussie\u0300re noire\u201d et ces \u201cde\u0301bris\u201d, selon les mots de la Nasa, ont e\u0301te\u0301 confie\u0301s a\u0300 une e\u0301quipe d\u2019analyse rapide, afin d\u2019obtenir une premie\u0300re ide\u0301e de la composition de Bennu.<\/p>\n<p>L\u2019e\u0301chantillon est passe\u0301 au crible a\u0300 l\u2019aide d\u2019un microscope e\u0301lectronique a\u0300 balayage, de la diffraction de rayons X, et de mesures infrarouges.<\/p>\n<p>Cela devrait permettre d\u2019obtenir un inventaire des mine\u0301raux observe\u0301s, et peut-e\u0302tre de de\u0301terminer leur proportion. Les scientifiques pensent notamment que Bennu renferme des mine\u0301raux hydrate\u0301s.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1190\" height=\"1125\" class=\"alignnone wp-image-20202 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125561.338285.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125561.338285.jpg 1190w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125561.338285-300x284.jpg 300w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125561.338285-1024x968.jpg 1024w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/10\/sm_1697125561.338285-768x726.jpg 768w\" sizes=\"auto, (max-width: 1190px) 100vw, 1190px\" \/><\/p>\n<p>L\u2019e\u0301tude des aste\u0301roi\u0308des doit permettre aux scientifiques de mieux comprendre la formation du syste\u0300me solaire, et comment la Terre est devenue habitable.<\/p>\n<p>Les aste\u0301roi\u0308des comme Bennu pourraient avoir apporte\u0301 sur Terre les compose\u0301s ayant permis par la suite la naissance de la vie, pensent certains scientifiques.<\/p>\n<p>La majorite\u0301 de l\u2019e\u0301chantillon sera conserve\u0301e pour e\u0302tre e\u0301tudie\u0301e par des ge\u0301ne\u0301rations futures, avec de nouveaux instruments plus performants, et pour re\u0301pondre a\u0300 de nouvelles questions scientifiques. C\u2019est ce qui avait e\u0301te\u0301 fait pour les roches lunaires rapporte\u0301es lors du programme Apollo.<\/p>\n<p>L\u2019analyse de Bennu pourrait aussi se re\u0301ve\u0301ler utile a\u0300 l\u2019avenir. Il existe un faible risque (une chance sur 2 700) que l\u2019aste\u0301roi\u0308de frappe la Terre en 2182, une collision qui serait catastrophique.<\/p>\n<p>Connai\u0302tre sa composition exacte pourrait ainsi aider, si besoin un jour, a\u0300 calculer l\u2019impact ne\u0301cessaire pour de\u0301vier sa trajectoire.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. La Nasa tient mercredi un e\u0301ve\u0301nement public puis une confe\u0301rence de presse pour pre\u0301senter les premie\u0300res images de l\u2019e\u0301chantillon d\u2019aste\u0301roi\u0308de recueilli par la sonde Osiris-Rex, le plus gros jamais collecte\u0301 dans l\u2019espace. L\u2019e\u0301ve\u0301nement devrait ravir tous les passionne\u0301s d\u2019espace : la Nasa doit re\u0301ve\u0301ler, mercredi 11 octobre, les premie\u0300res images du plus [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":20203,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-20204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Les premi\u00e8res images du plus gros \u00e9chantillon d\u2019ast\u00e9ro\u00efde jamais collect\u00e9 d\u00e9voil\u00e9es par la Nasa - Madagascar<\/title>\n<meta name=\"description\" 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