{"id":13576,"date":"2021-02-19T12:46:14","date_gmt":"2021-02-19T12:46:14","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=13576"},"modified":"2021-02-24T17:43:18","modified_gmt":"2021-02-24T17:43:18","slug":"de-lowell-a-perseverance-la-planete-mars-nous-a-toujours-fait-rever","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/19\/de-lowell-a-perseverance-la-planete-mars-nous-a-toujours-fait-rever\/","title":{"rendered":"De Lowell \u00e0 Perseverance, la plan\u00e8te Mars nous a toujours fait r\u00eaver"},"content":{"rendered":"<p><strong>Des \u00e9tranges visions de Percival Lowell \u00e0 l&#8217;atterrissage du rover Perseverance, retour sur plus d&#8217;un si\u00e8cle de passion pour la plan\u00e8te Mars.<\/strong><\/p>\n<h5>Une plan\u00e8te intrigante :<\/h5>\n<p>Mars est sans conteste la plan\u00e8te qui nous fascine le plus. Sa couleur ocre (en raison de la pr\u00e9sence d&#8217;oxyde de fer \u00e0 sa surface) et ses variations de luminosit\u00e9 (sa distance peut varier de 50 \u00e0 400 millions de kilom\u00e8tres) avaient \u00e9t\u00e9 remarqu\u00e9es depuis l&#8217;Antiquit\u00e9. Les premi\u00e8res observations t\u00e9lescopiques d\u00e9but\u00e8rent avec <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a>. L&#8217;am\u00e9lioration des instruments apporta de nouveaux indices troublants. La Plan\u00e8te rouge tournait sur elle-m\u00eame \u00e0 la m\u00eame vitesse que la Terre, et on y observait des calottes polaires ainsi que des changements d&#8217;aspect saisonniers.<\/p>\n<figure id=\"attachment_12842\" aria-describedby=\"caption-attachment-12842\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars.jpg\" rel=\"lightbox[13576]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12842\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/mars.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12842\" class=\"wp-caption-text\">Mars photographi\u00e9e \u00e0 l&#8217;aide d&#8217;un t\u00e9lescope de 1 m\u00e8tre de diam\u00e8tre. \u00a9 Damian Peach<\/figcaption><\/figure>\n<p>Dans les ann\u00e9es 1880, on cru m\u00eame d\u00e9tecter la pr\u00e9sence d&#8217;eau dans l&#8217;atmosph\u00e8re martienne. Il ne manquait plus que l&#8217;entr\u00e9e en sc\u00e8ne de Percival Lowell pour asseoir le mythe de la Plan\u00e8te rouge.\u00a0 <!--more--><\/p>\n<h5>Visions trompeuses :<\/h5>\n<p>Riche industriel am\u00e9ricain, Percival Lowell (1855-1916) consacra sa vie et sa fortune \u00e0 l&#8217;observation de Mars. Il se fit construire un observatoire dans l\u2019Arizona qu&#8217;il \u00e9quipa d\u2019une lunette de 60 cm de diam\u00e8tre. Observant assid\u00fbment la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/16\/mars-express-survole-pole-nord-de-planete-rouge\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te rouge<\/a>, il se mit \u00e0 y voir un dense r\u00e9seau de canaux qu\u2019il dessina. Selon sa th\u00e9orie, des habitants intelligents avaient construit un immense syst\u00e8me d\u2019irrigation \u00e0 l\u2019\u00e9chelle de la plan\u00e8te. Des ouvrages destin\u00e9s \u00e0 amener l\u2019eau des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/22\/en-video-le-survol-du-pole-sud-de-la-planete-mars\/\" target=\"_blank\" rel=\"noopener\">calottes polaires<\/a> jusqu\u2019aux r\u00e9gions \u00e9quatoriales arides.<\/p>\n<figure id=\"attachment_9892\" aria-describedby=\"caption-attachment-9892\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell.jpg\" rel=\"lightbox[13576]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9892\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell-450x275.jpg\" alt=\"\" width=\"450\" height=\"275\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell-450x275.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell-768x469.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell-1024x626.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell.jpg 1186w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9892\" class=\"wp-caption-text\">Percival Lowell en 1914 observant Mars \u00e0 la lunette de son observatoire en Arizona.<\/figcaption><\/figure>\n<p>Aveugl\u00e9 par sa passion, Percival Lowell fut en r\u00e9alit\u00e9 victime d\u2019illusions d\u2019optique provoqu\u00e9es par la turbulence atmosph\u00e9rique, la fatigue visuelle et les imperfections de sa lunette.<\/p>\n<h5>La construction d&#8217;un mythe :<\/h5>\n<p>Malgr\u00e9 le d\u00e9menti apport\u00e9 par des observations r\u00e9alis\u00e9es apr\u00e8s 1900 par de plus gros t\u00e9lescopes, les canaux de Lowell devinrent tr\u00e8s populaires. Pour le grand public, l&#8217;id\u00e9e de la vie sur Mars, une plan\u00e8te qui ressemblait \u00e0 la Terre comme une s\u0153ur, \u00e9tait indiscutable. Au point qu&#8217;en 1938, un jeune auteur, Orson Welles, raconta \u00e0 la radio am\u00e9ricaine une invasion de la Terre par des Martiens. Son r\u00e9cit, adapt\u00e9 d&#8217;un roman de science fiction \u00e9crit par Herbert George Wells, <em>La Guerre des Mondes<\/em>, sema la confusion dans la population.<\/p>\n<figure id=\"attachment_9893\" aria-describedby=\"caption-attachment-9893\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2.jpg\" rel=\"lightbox[13576]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9893\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2-450x301.jpg\" alt=\"\" width=\"450\" height=\"301\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2-450x301.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2-768x514.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2-1024x685.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/11\/lowell2.jpg 1421w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9893\" class=\"wp-caption-text\">Carte des canaux martiens r\u00e9alis\u00e9e par Percival Lowell \u00e0 partir de ses observations.<\/figcaption><\/figure>\n<p>Les donn\u00e9es recueillies par les astronomes \u00e9taient pourtant bien diff\u00e9rentes. Mars se r\u00e9v\u00e9lait comme une plan\u00e8te froide, s\u00e8che, dot\u00e9e d&#8217;une atmosph\u00e8re charg\u00e9e en dioxyde de carbone.<\/p>\n<p><strong>Des sondes et un visage :<\/strong><\/p>\n<p>\u00c0 partir des ann\u00e9es 1960, la plan\u00e8te Mars fit l&#8217;objet d&#8217;une grande campagne d&#8217;observations \u00e0 l&#8217;aide de multiples missions robotis\u00e9es. Elles sont rassembl\u00e9es dans ce saisissant montage (<a href=\"https:\/\/www.planetary.org\/space-images\/the-mars-exploration-family-portrait\" target=\"_blank\" rel=\"noopener\"><em>Mars Exploration Family Portrait<\/em><\/a>) :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/02\/portrait.jpg\" rel=\"lightbox[13576]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-13578\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/02\/portrait-450x375.jpg\" alt=\"\" width=\"450\" height=\"375\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/02\/portrait-450x375.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/02\/portrait-768x640.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/02\/portrait.jpg 900w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Les donn\u00e9es scientifiques ne cess\u00e8rent de s&#8217;accumuler, mais les superstitions r\u00e9sistaient. En 1976, l\u2019orbiteur Viking 1 photographia une tr\u00e8s belle illusion d\u2019optique<em>. <\/em> Il s\u2019agissait d\u2019un relief qui ressemble \u00e0 une t\u00eate humaine. Elle devint la photo culte de toute une g\u00e9n\u00e9ration de passionn\u00e9s d\u2019extraterrestres et de petits hommes verts. Ce n&#8217;\u00e9tait pourtant qu&#8217;une simple par\u00e9idolie (quand notre cerveau associe une forme famili\u00e8re \u00e0 une image).<\/p>\n<figure id=\"attachment_9480\" aria-describedby=\"caption-attachment-9480\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/visagemars1.jpg\" rel=\"lightbox[13576]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9480\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/visagemars1-450x337.jpg\" alt=\"\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/visagemars1-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/visagemars1-768x574.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/07\/visagemars1.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-9480\" class=\"wp-caption-text\">Le visage de Mars photographi\u00e9 par l\u2019orbiteur Viking 1 le 25 juillet 1976. \u00a9 NASA<\/figcaption><\/figure>\n<p>Les photographies haute r\u00e9solution obtenues ult\u00e9rieurement r\u00e9v\u00e8leront la vraie nature de ce visage. Surnomm\u00e9 <em>Cydonia Mensae<\/em>, c&#8217;est un relief r\u00e9siduel allong\u00e9 au-dessus duquel se succ\u00e8dent quelques sommets \u00e9rod\u00e9s.<\/p>\n<h5>La science et le r\u00eave :<\/h5>\n<p>Avec <a href=\"https:\/\/mars.nasa.gov\/mars2020\/\" target=\"_blank\" rel=\"noopener\">Perceverance<\/a>, mais \u00e9galement toutes les autres missions en cours, l&#8217;exploration de Mars se poursuit. Les scientifiques esp\u00e8rent y trouver des traces de vie pass\u00e9e. Et les agence spatiales r\u00eavent d&#8217;y poser le pied dans quelques d\u00e9cennies. La Plan\u00e8te rouge devrait continuer \u00e0 nous faire r\u00eaver encore longtemps&#8230;<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/17\/arrivee-de-perseverance-ou-se-trouve-mars-dans-le-ciel-ce-soir\/\" target=\"_blank\" rel=\"noopener\">Arriv\u00e9e de Perseverance : o\u00f9 se trouve Mars dans le ciel ce soir ?\u00a0<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/08\/voici-la-plus-belle-image-de-la-planete-mars-jamais-realisee\/\" target=\"_blank\" rel=\"noopener\">Voici la plus belle image de la plan\u00e8te Mars jamais r\u00e9alis\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/04\/planete-mars-decouvrez-les-etonnants-crateres-inverses\/\" target=\"_blank\" rel=\"noopener\">D\u2019o\u00f9 viennent les curieux crat\u00e8res invers\u00e9s sur Mars ?<\/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>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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>Des \u00e9tranges visions de Percival Lowell \u00e0 l&#8217;atterrissage du rover Perseverance, retour sur plus d&#8217;un si\u00e8cle de passion pour la plan\u00e8te Mars. Une plan\u00e8te intrigante : Mars est sans conteste la plan\u00e8te qui nous fascine le plus. Sa couleur ocre (en raison de la pr\u00e9sence d&#8217;oxyde de fer \u00e0 sa surface) et ses variations de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/19\/de-lowell-a-perseverance-la-planete-mars-nous-a-toujours-fait-rever\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">De Lowell \u00e0 Perseverance, la plan\u00e8te Mars nous a toujours fait r\u00eaver<\/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":13577,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[116,1781,2995],"class_list":["post-13576","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-mars","tag-percival-lowell","tag-perseverance"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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