{"id":16446,"date":"2015-09-28T20:58:02","date_gmt":"2015-09-28T19:58:02","guid":{"rendered":"http:\/\/kapitalis.com\/tunisie\/?p=16446"},"modified":"2015-09-29T08:22:41","modified_gmt":"2015-09-29T07:22:41","slug":"nasa-decouverte-deau-salee-sur-mars","status":"publish","type":"post","link":"https:\/\/kapitalis.com\/tunisie\/2015\/09\/28\/nasa-decouverte-deau-salee-sur-mars\/","title":{"rendered":"Nasa : D\u00e9couverte d\u2019eau sal\u00e9e sur Mars"},"content":{"rendered":"<p><em><strong><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16452 aligncenter\" src=\"http:\/\/kapitalis.com\/tunisie\/wp-content\/uploads\/2015\/09\/Mars-2.jpeg\" alt=\"Mars (2)\" width=\"626\" height=\"380\" \/><\/strong><\/em><\/p>\n<p><em><strong>Les photos prises par la sonde Mars Reconnaissance Orbiter (MRO) ont permis de d\u00e9tecter la pr\u00e9sence d\u2019eau sal\u00e9e sur la plan\u00e8te Mars, a r\u00e9v\u00e9l\u00e9 la Nasa. Explications\u2026<\/strong><\/em><\/p>\n<p><!--more--><\/p>\n<p>Cette r\u00e9v\u00e9lation \u00e9tait attendue depuis l\u2019annonce, faite par la Nasa, qu\u2019une importante d\u00e9couverte scientifique en rapport avec Mars allait \u00eatre divulgu\u00e9e.<\/p>\n<p>L\u2019attente valait la peine, puisque l\u2019agence spatiale a annonc\u00e9 que des coul\u00e9es saisonni\u00e8res sombres ont pu \u00eatre observ\u00e9es sur des pentes de la plan\u00e8te rouge. La Nasa a pr\u00e9cis\u00e9, lors d\u2019une conf\u00e9rence de presse, que ces coul\u00e9es ne faisaient leur apparition que lorsque la temp\u00e9rature devient plus cl\u00e9mente sur Mars. Les \u00e9coulements sont constitu\u00e9s d\u2019eau, en petite partie, de chlorate et perchlorate de magn\u00e9sium et de perchlorate de sodium.<\/p>\n<h3>Un peu d&rsquo;eau, beaucoup de sel<\/h3>\n<p>La Nasa avait d\u00e9j\u00e0 envisag\u00e9 la pr\u00e9sence d\u2019un liquide sur Mars suite aux \u00e9coulements observ\u00e9s en 1997 sur des pentes martiennes. Il s\u2019\u00e9tait finalement av\u00e9r\u00e9 que ces \u00e9coulements \u00e9taient provoqu\u00e9s par de la glace carbonique et non pas par un liquide.<\/p>\n<p>Pour ce qui est de cette nouvelle d\u00e9couverte,\u00a0 ce sont les photos haute d\u00e9finition du satellite MRO, qui survole la Plan\u00e8te rouge depuis 2006, qui ont permis au chercheur am\u00e9ricain Lujendra Ojha et son \u00e9quipe d\u2019observer les lignes qui s\u2019\u00e9paississent sur les pentes martiennes lorsque la temp\u00e9rature augmente.<\/p>\n<p>La composition des min\u00e9raux martiens \u00a0a ensuite \u00e9t\u00e9 \u00e9tudi\u00e9e gr\u00e2ce au spectrom\u00e8tre de l\u2019appareil photo sur le satellite MRO. Le chercheur explique ainsi que l\u2019eau, qui n\u2019a pas directement \u00e9t\u00e9 d\u00e9tect\u00e9e, est forcement entr\u00e9e dans la composition des \u00e9coulements.<\/p>\n<p>En effet, \u00a0les conditions de temp\u00e9rature et de pression \u00e0 la surface de Mars ne permettent pas l\u2019\u00e9coulement d\u2019eau liquide en surface. Toutefois, combin\u00e9 aux sels, le m\u00e9lange peut se maintenir \u00e0 l\u2019\u00e9tat liquide.<\/p>\n<p>Cette d\u00e9couverte relance les espoirs quant \u00e0 l\u2019existence d\u2019une vie, m\u00eame \u00e0 l\u2019\u00e9tat microbien, sur Mars. L\u2019agence spatiale table d\u2019ailleurs sur une mission habit\u00e9e sur la plan\u00e8te rouge \u00e0 l\u2019horizon 2030.<\/p>\n<p style=\"text-align: right;\"><strong>H. K.<\/strong><\/p>\n<p style=\"text-align: right;\">\n","protected":false},"excerpt":{"rendered":"<p>Les photos prises par la sonde Mars Reconnaissance Orbiter (MRO) ont permis de d\u00e9tecter la pr\u00e9sence d\u2019eau sal\u00e9e sur la plan\u00e8te Mars, a r\u00e9v\u00e9l\u00e9 la Nasa. Explications\u2026<\/p>\n","protected":false},"author":13,"featured_media":16447,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[998],"tags":[6886],"class_list":["post-16446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe","tag-nasa"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Nasa : D\u00e9couverte d\u2019eau sal\u00e9e sur Mars - Kapitalis<\/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:\/\/kapitalis.com\/tunisie\/2015\/09\/28\/nasa-decouverte-deau-salee-sur-mars\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nasa : D\u00e9couverte d\u2019eau sal\u00e9e sur Mars - Kapitalis\" \/>\n<meta property=\"og:description\" content=\"Les photos prises par la sonde Mars Reconnaissance Orbiter (MRO) ont permis de d\u00e9tecter la pr\u00e9sence d\u2019eau sal\u00e9e sur la plan\u00e8te Mars, a r\u00e9v\u00e9l\u00e9 la Nasa. 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