{"id":22768,"date":"2026-05-07T15:58:03","date_gmt":"2026-05-07T15:58:03","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=22768"},"modified":"2026-05-07T15:58:03","modified_gmt":"2026-05-07T15:58:03","slug":"curiosite-des-dunes-alignees-au-fond-dune-vallee-martienne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/05\/07\/curiosite-des-dunes-alignees-au-fond-dune-vallee-martienne\/","title":{"rendered":"Curiosit\u00e9 : des dunes align\u00e9es au fond d&#8217;une vall\u00e9e martienne"},"content":{"rendered":"<p><strong>L\u2019orbiteur martien MRO a photographi\u00e9 de curieuses dunes align\u00e9es selon un axe Nord-Sud dans le fond d&#8217;une vall\u00e9e.<\/strong><\/p>\n<h5>Mars vue d\u2019orbite :<\/h5>\n<p>Chaque mission spatiale en direction de\u00a0<a href=\"https:\/\/cnes.fr\/dossiers\/planete-mars\" target=\"_blank\" rel=\"noopener noreferrer\">Mars<\/a> nous apporte son lot de magnifiques images. Il y a bien s\u00fbr 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> ou <a href=\"https:\/\/cnes.fr\/projets\/supercam\" target=\"_blank\" rel=\"noopener\">Perseverance<\/a>. Mais les engins en orbite nous offrent \u00e9galement des visions saisissantes. C\u2019est le cas par exemple de MRO (<a href=\"https:\/\/mars.nasa.gov\/mro\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Mars Reconnaissance Orbiter<\/em><\/a>). Depuis 2006, ce satellite est install\u00e9 sur une orbite polaire basse autour de la Plan\u00e8te rouge :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1.jpg\" rel=\"lightbox[22768]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22128\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/12\/mro1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Sa cam\u00e9ra <a href=\"https:\/\/www.uahirise.org\/hipod\/ESP_076869_1535?\" target=\"_blank\" rel=\"noopener\">HiRIZE<\/a> est constitu\u00e9e d\u2019un t\u00e9lescope de 0,5 m\u00e8tre de diam\u00e8tre pour une longueur focale de 12 m\u00e8tres. C\u2019est \u00e0 ce jour la plus grosse cam\u00e9ra jamais embarqu\u00e9e sur une sonde spatiale. Le 7 octobre 2025, HiRIZE r\u00e9alisait sa <a href=\"https:\/\/www.uahirise.org\/ESP_089986_1980?\" target=\"_blank\" rel=\"noopener\">cent milli\u00e8me image<\/a>\u00a0depuis l\u2019orbite martienne.<!--more--><\/p>\n<h5>Coups de vent :<\/h5>\n<p>Une telle r\u00e9solution permet de suivre l&#8217;\u00e9volution des dunes martiennes, sculpt\u00e9es par le vent. En effet, \u00e0 c\u00f4t\u00e9 des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Temp%C3%AAte_de_poussi%C3%A8res_sur_Mars\" target=\"_blank\" rel=\"noopener\">puissantes temp\u00eates<\/a> observ\u00e9es depuis longtemps, les plan\u00e9tologues ont d\u00e9couvert une discr\u00e8te activit\u00e9 \u00e9olienne qui fa\u00e7onne lentement les paysages. Exemple avec ces curieuses dunes align\u00e9es au fond d&#8217;une vall\u00e9e, mises en valeur sur cette image en fausses couleurs :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars.jpg\" rel=\"lightbox[22768]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22770\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Un spectacle \u00e9trange qui se r\u00e9p\u00e8te dans les vall\u00e9es et les crat\u00e8res environnants, comme on peut le constater sur un clich\u00e9 grand champ. Sur ces images, les plus petits d\u00e9tails discernables mesurent 150 centim\u00e8tres :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2.jpg\" rel=\"lightbox[22768]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22771\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>La sc\u00e8ne a \u00e9t\u00e9 saisie sous l&#8217;\u00e9quateur martien, \u00e0 mi-chemin entre le grand canyon de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Valles_Marineris\" target=\"_blank\" rel=\"noopener\">Valles Marineris<\/a> et le bassin d&#8217;impact d&#8217;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Hellas_Planitia\" target=\"_blank\" rel=\"noopener\">Hellas Planitia<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars3.jpg\" rel=\"lightbox[22768]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22772\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars3-450x217.jpg\" alt=\"\" width=\"450\" height=\"217\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars3-450x217.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars3-768x370.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/dune_mars3.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li>\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\/2025\/04\/02\/mars-derriere-la-lune-depuis-lobservatoire-de-kitt-peak\/\" target=\"_blank\" rel=\"noopener\">Mars derri\u00e8re la Lune depuis l\u2019Observatoire de Kitt Peak<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/12\/17\/planete-mars-cent-mille-images-pour-lorbiteur-mro\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te Mars : cent mille images pour l\u2019orbiteur MRO !<\/a><\/li>\n<\/ul>\n<\/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>.<\/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>L\u2019orbiteur martien MRO a photographi\u00e9 de curieuses dunes align\u00e9es selon un axe Nord-Sud dans le fond d&#8217;une vall\u00e9e. Mars vue d\u2019orbite : Chaque mission spatiale en direction de\u00a0Mars nous apporte son lot de magnifiques images. Il y a bien s\u00fbr les clich\u00e9s obtenus par les rovers comme Curiosity ou Perseverance. Mais les engins en orbite &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/05\/07\/curiosite-des-dunes-alignees-au-fond-dune-vallee-martienne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Curiosit\u00e9 : des dunes align\u00e9es au fond d&#8217;une vall\u00e9e martienne<\/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":22770,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1447,116,771,115],"class_list":["post-22768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-hirize","tag-mars","tag-mro","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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