
{"id":2397,"date":"2021-10-10T15:52:24","date_gmt":"2021-10-10T13:52:24","guid":{"rendered":"https:\/\/parlonstechs.com\/all\/?p=2397"},"modified":"2021-10-10T16:04:52","modified_gmt":"2021-10-10T14:04:52","slug":"le-robot-perseverance-confirme-la-presence-dun-ancien-lac-sur-mars","status":"publish","type":"post","link":"https:\/\/parlonstechs.com\/all\/2021\/10\/10\/le-robot-perseverance-confirme-la-presence-dun-ancien-lac-sur-mars\/","title":{"rendered":"Le Robot Perseverance confirme la pr\u00e9sence d&rsquo;un ancien lac sur Mars"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"980\" height=\"552\" src=\"https:\/\/parlonstechs.com\/all\/wp-content\/uploads\/2021\/10\/image-7.png\" alt=\"\" class=\"wp-image-2399\" srcset=\"https:\/\/parlonstechs.com\/all\/wp-content\/uploads\/2021\/10\/image-7.png 980w, https:\/\/parlonstechs.com\/all\/wp-content\/uploads\/2021\/10\/image-7-300x169.png 300w, https:\/\/parlonstechs.com\/all\/wp-content\/uploads\/2021\/10\/image-7-768x433.png 768w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/figure>\n\n\n\n<p style=\"font-size:24px\"><strong>Pos\u00e9 sur Mars depuis le mois de f\u00e9vrier, le robot Perseverance livre ses premiers r\u00e9sultats. L&rsquo;engin a d\u00e9couvert que l&rsquo;endroit o\u00f9 il a atterri \u00e9tait un ancien lac sur la Plan\u00e8te rouge.<\/strong><\/p>\n\n\n\n<p>C&rsquo;\u00e9tait attendu, mais les&nbsp;premi\u00e8res images en haute r\u00e9solution de la cam\u00e9ra confirment&nbsp;les indices de l&rsquo;observation en orbite&nbsp;:&nbsp;le crat\u00e8re, d&rsquo;une surface d&rsquo;environ 35 km de diam\u00e8tre et une centaine de m\u00e8tres au plus profond, a bien abrit\u00e9 un lac ferm\u00e9, anciennement aliment\u00e9 par une rivi\u00e8re via un delta, il y a entre 3,6 et 3 milliards d&rsquo;ann\u00e9es.<\/p>\n\n\n\n<p>Gr\u00e2ce aux observations satellites, on en a vu les traces&nbsp;dans le crat\u00e8re appel\u00e9 Jezero. C&rsquo;est pour cette raison qu&rsquo;on y a pos\u00e9 le <a href=\"https:\/\/www.rfi.fr\/fr\/en-bref\/20210218-le-rover-am\u00e9ricain-perseverance-s-est-pos\u00e9-sur-mars\" target=\"_blank\" rel=\"noopener\"><strong>robot Perseverance<\/strong> <\/a>en f\u00e9vrier dernier. Huit mois plus tard, c&rsquo;est la confirmation. Une confirmation pleine de promesses pour la suite de la mission.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jusqu&rsquo;\u00e0 la source du delta<\/h2>\n\n\n\n<p>L&rsquo;\u00e9tude publi\u00e9e ce jeudi dans la prestigieuse revue <em>Science<\/em> \u2013&nbsp;la premi\u00e8re depuis l&rsquo;atterrissage de Perseverance&nbsp;\u2013 donne une foule de d\u00e9tails in\u00e9dits sur l&rsquo;histoire de l&rsquo;ancien site lacustre. \u00ab<em>&nbsp;On a des strates qui sont typiques d&rsquo;un assemblage form\u00e9 sous l&rsquo;eau avec une rivi\u00e8re qui a avanc\u00e9 \u00e0 l&rsquo;int\u00e9rieur d&rsquo;un lac et d\u00e9pos\u00e9 des s\u00e9diments<\/em>&nbsp;\u00bb<em>, <\/em>explique Nicolas Mangold, de l&rsquo;Universit\u00e9 de Nantes, qui a dirig\u00e9 cette \u00e9tude.&nbsp;Le chercheur parle d&rsquo;un agencement s\u00e9dimentaire qui est vraiment typique de d\u00e9p\u00f4ts lacustres.<\/p>\n\n\n\n<p><em>\u00ab<\/em>&nbsp;<em>Et c&rsquo;est comme sur Terre, les s\u00e9diments lacustres sont de tr\u00e8s bons r\u00e9servoirs pour pr\u00e9server des s\u00e9diments et int\u00e9grer dans ces s\u00e9diments d&rsquo;\u00e9ventuelles formes organiques, <\/em>poursuit-il.<em>&nbsp;S&rsquo;il y a eu un jour la vie, elle a pu g\u00e9n\u00e9rer des mati\u00e8res organiques et si cette mati\u00e8re elle existe, elle va \u00eatre pr\u00e9serv\u00e9e dans ces s\u00e9diments-l\u00e0. Donc \u00e7a nous donne les endroits cl\u00e9s pour analyser ce crat\u00e8re. Et c&rsquo;est sur quoi on travaille en ce moment, c&rsquo;est faire la travers\u00e9e du rover \u00e0 la source du delta.<\/em>&nbsp;\u00bb<\/p>\n\n\n\n<p>Une travers\u00e9e de deux&nbsp;kilom\u00e8tres pour&nbsp;<a href=\"https:\/\/www.rfi.fr\/fr\/am\u00e9riques\/20200730-espace-le-robot-perseverance-lanc\u00e9-vers-mars-d\u00e9couvrir-traces-vie\" target=\"_blank\" rel=\"noopener\"><strong>Perseverance<\/strong><\/a>. Deux&nbsp;kilom\u00e8tres parsem\u00e9s d&#8217;emb\u00fbches avant d&rsquo;atteindre ces s\u00e9diments.&nbsp;Le robot pourra alors les analyser sur place, et surtout en pr\u00e9lever des \u00e9chantillons, qui seront ramen\u00e9s sur Terre lors d&rsquo;une future mission \u00e0 l&rsquo;horizon 2030. Mais attention \u00e0 ne pas s&#8217;emballer trop vite, a averti le chercheur, car cette mati\u00e8re organique pourrait tout aussi bien provenir de \u00ab&nbsp;<em>mati\u00e8re carbon\u00e9e inerte<\/em>&nbsp;\u00bb, comme celle d\u00e9pos\u00e9e par les com\u00e8tes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Gros galets et blocs rocheux<\/h2>\n\n\n\n<p>Perseverance a en outre d\u00e9tect\u00e9 la pr\u00e9sence inattendue de gros galets et blocs rocheux, t\u00e9moins de forts courants fluviaux comme des crues soudaines. La fin de la p\u00e9riode lacustre du crat\u00e8re aurait donc \u00e9t\u00e9 le th\u00e9\u00e2tre d&rsquo;un changement climatique majeur, sugg\u00e8re l&rsquo;\u00e9tude. \u00ab&nbsp;<em>Quel climat a pu g\u00e9n\u00e9rer cette transition&nbsp;? Une aridification, une glaciation&nbsp;? C&rsquo;est ce que nous cherchons<\/em>&nbsp;\u00bb, affirme&nbsp;le g\u00e9ologue.<\/p>\n\n\n\n<p>Deux autres robots, Curiosity et Insight, arpentent actuellement la surface martienne. En septembre 2022, la mission russo-europ\u00e9enne ExoMars doit envoyer un robot qui pourra forer le sol de la Plan\u00e8te rouge \u00e0 plus d&rsquo;un m\u00e8tre de profondeur.\u00a0Une premi\u00e8re.<\/p>\n\n\n\n<p>avec RFI<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pos\u00e9 sur Mars depuis le mois de f\u00e9vrier, le robot Perseverance livre ses premiers r\u00e9sultats. L&rsquo;engin a d\u00e9couvert que l&rsquo;endroit o\u00f9 il a atterri \u00e9tait un ancien lac sur la [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2402,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,18],"tags":[],"class_list":["post-2397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-sciences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le Robot Perseverance confirme la pr\u00e9sence d&#039;un ancien lac sur Mars - Parlons Techs - Store<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/parlonstechs.com\/all\/2021\/10\/10\/le-robot-perseverance-confirme-la-presence-dun-ancien-lac-sur-mars\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le Robot Perseverance confirme la pr\u00e9sence d&#039;un ancien lac sur Mars - Parlons Techs - Store\" \/>\n<meta property=\"og:description\" content=\"Pos\u00e9 sur Mars depuis le mois de f\u00e9vrier, le robot Perseverance livre ses premiers r\u00e9sultats. 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