{"id":24835,"date":"2022-09-19T16:35:27","date_gmt":"2022-09-19T16:35:27","guid":{"rendered":"https:\/\/www.africa-press.net\/mali\/politique\/comment-expliquer-ces-dunes-etranges-observees-sur-mars"},"modified":"2022-09-19T16:35:27","modified_gmt":"2022-09-19T16:35:27","slug":"comment-expliquer-ces-dunes-etranges-observees-sur-mars","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mali\/homepage-french\/comment-expliquer-ces-dunes-etranges-observees-sur-mars","title":{"rendered":"Comment expliquer ces dunes \u00e9tranges observ\u00e9es sur Mars ?"},"content":{"rendered":"

Africa-Press – Mali. <\/strong><\/span>La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter nous r\u00e9gale avec cette magnifique photographie de la surface de Mars r\u00e9v\u00e9lant des dunes \u00e0 la forme \u00e9trange.<\/p>\n

Mars Reconnaissance Orbiter, une sonde spatiale de la Nasa en activit\u00e9 autour de Mars depuis 2006, a l\u2019habitude de nous r\u00e9galer avec des images toujours plus \u00e9poustouflantes. Sa cam\u00e9ra, nomm\u00e9e Hirise, capture en effet d\u2019infimes d\u00e9tails de la surface plan\u00e9taire. Ils permettent aux scientifiques de mieux comprendre les m\u00e9canismes qui fa\u00e7onnent, ou ont fa\u00e7onn\u00e9 au cours du temps, le paysage martien.<\/p>\n

L\u2019\u0153uvre de fa\u00e7onnage des vents tourbillonnants<\/p>\n

Cette fois-ci, Hirise nous r\u00e9v\u00e8le des dunes de sable \u00e0 la forme tr\u00e8s \u00e9trange, positionn\u00e9es le long d\u2019une falaise dans Chasma Boreale, au niveau du p\u00f4le nord de Mars. Ce type de formation est pourtant assez courant sur Terre, mais \u00e9galement sur Mars. Il s\u2019agit de barkhanes. Ces dunes en forme de croissant se forment g\u00e9n\u00e9ralement dans les d\u00e9serts, sous l\u2019action d\u2019un vent soufflant fortement dans une direction pr\u00e9f\u00e9rentielle. La forme de la dune, et notamment les deux \u00ab cornes \u00bb du croissant, permettent de d\u00e9terminer le sens du vent.<\/p>\n

Mais les dunes photographi\u00e9es par Mars Reconnaissance Orbiter montrent des sch\u00e9mas plus excentriques qu\u2019habituellement. Les croissants pr\u00e9sentent en effet des formes plus complexes qui sugg\u00e8rent la pr\u00e9sence de vents tourbillonnants dans cette r\u00e9gion polaire de la Plan\u00e8te rouge.<\/p>\n

Mieux comprendre les changements saisonniers<\/p>\n

Pour prendre cette image, Hirise a utilis\u00e9 un filtre rouge-vert-bleu, qui donne une teinte bleut\u00e9e au sable, et permet de mieux appr\u00e9cier la forme des dunes. L\u2019image couvre une surface de moins d\u2019un kilom\u00e8tre et a \u00e9t\u00e9 prise d\u2019une altitude de 197 km.<\/p>\n

Les d\u00e9tails de cette image vont permettre aux scientifiques de mieux comprendre les changements m\u00e9t\u00e9orologiques saisonniers dans cette r\u00e9gion.<\/p>\n

Pour plus d’informations et d’analyses sur la Mali<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Mali. La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter nous r\u00e9gale avec cette magnifique photographie de la surface de Mars r\u00e9v\u00e9lant des dunes \u00e0 la forme \u00e9trange. Mars Reconnaissance Orbiter, une sonde spatiale de la Nasa en activit\u00e9 autour de Mars depuis 2006, a l\u2019habitude de nous r\u00e9galer avec des images toujours […]<\/p>\n","protected":false},"author":82,"featured_media":24834,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,11,17],"tags":[76,86,19],"class_list":["post-24835","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-mali","tag-mali"],"yoast_head":"\nComment expliquer ces dunes \u00e9tranges observ\u00e9es sur Mars ? - Mali<\/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:\/\/www.africa-press.net\/mali\/politique\/comment-expliquer-ces-dunes-etranges-observees-sur-mars\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment expliquer ces dunes \u00e9tranges observ\u00e9es sur Mars ?\" \/>\n<meta property=\"og:description\" content=\"Africa-Press – Mali. La cam\u00e9ra de la sonde spatiale Mars Reconnaissance Orbiter nous r\u00e9gale avec cette magnifique photographie de la surface de Mars r\u00e9v\u00e9lant des dunes \u00e0 la forme \u00e9trange. 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