{"id":12642,"date":"2020-10-09T16:23:41","date_gmt":"2020-10-09T16:23:41","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12642"},"modified":"2025-09-17T06:39:47","modified_gmt":"2025-09-17T06:39:47","slug":"en-images-la-beaute-des-dunes-sur-la-planete-mars","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/09\/en-images-la-beaute-des-dunes-sur-la-planete-mars\/","title":{"rendered":"En images : la beaut\u00e9 des dunes sur la plan\u00e8te Mars"},"content":{"rendered":"<p><strong>Parmi les innombrables images r\u00e9alis\u00e9es par l&#8217;orbiteur MRO, celles qui nous montrent les dunes sur la Plan\u00e8te rouge sont sans aucun doute les plus belles.\u00a0<\/strong><\/p>\n<h5>Mars vue d&#8217;orbite :<\/h5>\n<p>Chaque mission spatiale en direction de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/06\/au-plus-pres-de-la-terre-mars-nous-devoile-olympus-mons\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mars<\/a> nous apporte son lot de magnifiques images. Si les clich\u00e9s obtenus par les rovers comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/05\/video-revivez-lextraordinaire-odyssee-du-rover-curiosity\/\" target=\"_blank\" rel=\"noopener noreferrer\">Curiosity<\/a> sont spectaculaires, les engins en orbite nous offrent de leur c\u00f4t\u00e9 des visions saisissantes. C&#8217;est le cas par exemple de MRO (<a href=\"https:\/\/mars.nasa.gov\/mro\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Mars Reconnaissance Orbiter<\/em><\/a>) qui est install\u00e9 sur une orbite polaire basse autour de Mars depuis 2006. Sa cam\u00e9ra HiRIZE est constitu\u00e9e d\u2019un t\u00e9lescope de 0,5 m\u00e8tre de diam\u00e8tre pour une longueur focale de 12 m\u00e8tres.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4.jpg\" rel=\"lightbox[12642]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12646\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune4.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>C&#8217;est \u00e0 ce jour la plus grosse cam\u00e9ra jamais embarqu\u00e9e sur une sonde spatiale. Elle peut saisir des d\u00e9tails de 0,3 m\u00e8tre au sol depuis une altitude de 300 kilom\u00e8tres. Notez que le bleu des dunes est une fausse couleur utilis\u00e9e pour visualiser les r\u00e9gions o\u00f9 le sol est le plus froid.<\/p>\n<p><!--more--><\/p>\n<h5>Coups de vent :<\/h5>\n<p>Une telle r\u00e9solution permet de suivre le d\u00e9placement des dunes martiennes. Car\u00a0sur la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/16\/mars-express-survole-pole-nord-de-planete-rouge\/\" target=\"_blank\" rel=\"noopener noreferrer\">Plan\u00e8te rouge<\/a> le vent sculpte les paysages et il peut m\u00eame parfois souffler tr\u00e8s fort. Depuis que les t\u00e9lescopes terrestres sont assez puissants pour observer les d\u00e9tails de la topographie martienne, les astronomes ont assist\u00e9 \u00e0 plusieurs temp\u00eates capables de soulever d\u2019importantes quantit\u00e9s de poussi\u00e8res et de masquer les paysages durant plusieurs semaines.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3.jpg\" rel=\"lightbox[12642]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12645\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3-450x283.jpg\" alt=\"\" width=\"450\" height=\"283\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3-450x283.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3-1024x643.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3-768x483.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune3.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>En 1971 une temp\u00eate se produisit lors de l\u2019arriv\u00e9e en orbite martienne de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Mariner_9\" target=\"_blank\" rel=\"noopener noreferrer\">Mariner 9<\/a>, obligeant la NASA \u00e0 retarder le travail cartographique assign\u00e9 \u00e0 la sonde. M\u00eame situation en 2018 o\u00f9 il avait suffit d\u2019un mois pour qu&#8217;une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/07\/05\/comment-tempete-sable-transforme-planete-mars\/\" target=\"_blank\" rel=\"noopener noreferrer\">temp\u00eate de sable<\/a> se r\u00e9pande sur toute la surface de la Plan\u00e8te rouge.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2.jpg\" rel=\"lightbox[12642]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12644\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2-450x281.jpg\" alt=\"\" width=\"450\" height=\"281\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2-450x281.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2-1024x640.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2-768x480.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune2.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Mais il n&#8217;y a pas que des temp\u00eates aussi spectaculaires. Il existe une grande vari\u00e9t\u00e9 de vents qui fa\u00e7onnent lentement le relief de la plan\u00e8te Mars. Les plan\u00e9tologues ont d\u2019abord pens\u00e9 que la visualisation de ces manifestations \u00e9oliennes demanderait du temps. Ils imaginaient que le travail du vent se r\u00e9v\u00e9lerait en comparant des images prises \u00e0 plusieurs ann\u00e9es d\u2019intervalle.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5.jpg\" rel=\"lightbox[12642]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12648\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5-450x303.jpg\" alt=\"\" width=\"450\" height=\"303\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5-450x303.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5-1024x689.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5-768x516.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune5.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Ils ont d\u00e9couvert une action bien plus rapide. Des vents sont capables de d\u00e9placer le sable en seulement quelques semaines. On l&#8217;a constat\u00e9 avec la poussi\u00e8re d\u00e9pos\u00e9e sur les panneaux solaires des rovers et m\u00eame au niveau de leurs empreintes de roues qui sont parfois effac\u00e9es en moins d&#8217;un mois !<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1.jpg\" rel=\"lightbox[12642]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12643\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1-450x281.jpg\" alt=\"\" width=\"450\" height=\"281\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1-450x281.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1-1024x640.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1-768x480.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/10\/dune1.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/08\/mars-et-ses-lunes-quelques-jours-avant-lopposition\/\" target=\"_blank\" rel=\"noopener\">Mars et ses lunes, quelques jours avant l\u2019opposition<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/04\/comment-reussir-vos-photographies-planetaires\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9ussir vos photographies plan\u00e9taires<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/06\/astrophoto-le-systeme-solaire-selon-tom-williams\/\" target=\"_blank\" rel=\"noopener\">Astrophoto : le Syst\u00e8me solaire selon Tom Williams<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Parmi les innombrables images r\u00e9alis\u00e9es par l&#8217;orbiteur MRO, celles qui nous montrent les dunes sur la Plan\u00e8te rouge sont sans aucun doute les plus belles.\u00a0 Mars vue d&#8217;orbite : Chaque mission spatiale en direction de Mars nous apporte son lot de magnifiques images. Si les clich\u00e9s obtenus par les rovers comme Curiosity sont spectaculaires, les &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/09\/en-images-la-beaute-des-dunes-sur-la-planete-mars\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En images : la beaut\u00e9 des dunes sur la plan\u00e8te Mars<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":12646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[2160,116,115],"class_list":["post-12642","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-dune","tag-mars","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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