{"id":207250,"date":"2021-03-24T11:56:53","date_gmt":"2021-03-24T10:56:53","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=207250"},"modified":"2021-03-24T11:56:53","modified_gmt":"2021-03-24T10:56:53","slug":"la-nasa-va-tenter-de-faire-voler-un-helicoptere-au-dessus-de-mars","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/la-nasa-va-tenter-de-faire-voler-un-helicoptere-au-dessus-de-mars\/","title":{"rendered":"La Nasa va tenter de faire voler un h\u00e9licopt\u00e8re au-dessus de Mars"},"content":{"rendered":"<div>La Nasa tentera d\u00e9but avril le premier vol d\u2019un engin motoris\u00e9 sur une autre plan\u00e8te, en essayant de faire d\u00e9coller l\u2019h\u00e9licopt\u00e8re Ingenuity sur Mars, a annonc\u00e9 ce mardi 23 mars l\u2019agence spatiale am\u00e9ricaine.<\/div>\n<div>Pour le moment, cet h\u00e9licopt\u00e8re ultra-l\u00e9ger, qui ressemble en r\u00e9alit\u00e9 davantage \u00e0 un gros drone, est encore repli\u00e9 et attach\u00e9 sous le rover Perseverance, qui a atterri sur la plan\u00e8te rouge le mois dernier.<\/div>\n<div>\u201cNotre meilleure estimation \u00e0 l\u2019heure actuelle est le 8 avril\u201d, a d\u00e9clar\u00e9 lors d\u2019une conf\u00e9rence de presse Bob Balaram, ing\u00e9nieur en chef d\u2019Ingenuity, \u00e0 propos de la date de ce qui sera l\u2019\u00e9quivalent sur Mars du premier vol d\u2019un a\u00e9ronef sur Terre, r\u00e9alis\u00e9 par les fr\u00e8res Wright en 1903. Le jour exact pourrait toutefois encore changer, a-t-il pr\u00e9cis\u00e9.<\/div>\n<div><\/div>\n<div><strong>*Un vol stationnaire de quelques secondes pour commencer<\/strong><\/div>\n<div>Si l\u2019exp\u00e9rience est r\u00e9ussie, il s\u2019agira d\u2019une v\u00e9ritable prouesse car l\u2019air martien est d\u2019une densit\u00e9 \u00e9quivalente \u00e0 seulement 1% de celle de l\u2019atmosph\u00e8re terrestre.<\/div>\n<div>Il est pr\u00e9vu que le premier vol soit tr\u00e8s simple: apr\u00e8s avoir d\u00e9coll\u00e9 \u00e0 la verticale, l\u2019h\u00e9licopt\u00e8re s\u2019\u00e9l\u00e8vera \u00e0 une altitude de 3 m\u00e8tres, s\u2019y maintiendra en vol stationnaire durant 30 secondes, puis effectuera une rotation sur lui-m\u00eame avant de se reposer au sol. Il recevra ses instructions de la Terre quelques heures auparavant, mais analysera lui-m\u00eame sa position par rapport au sol durant le vol, en prenant 30 photos par seconde.<\/div>\n<div>La Nasa a d\u2019ores et d\u00e9j\u00e0 d\u00e9termin\u00e9 le terrain au-dessus duquel l\u2019h\u00e9licopt\u00e8re \u00e9voluera, situ\u00e9 au nord du lieu d\u2019atterrissage du rover. Perseverance doit encore finir de rouler jusqu\u2019\u00e0 cette piste, \u201cce qui prendra encore quelques jours\u201d, a d\u00e9clar\u00e9 Farah Alibay, en charge pour la Nasa de faire le lien entre les \u00e9quipes charg\u00e9es du v\u00e9hicule et de l\u2019h\u00e9licopt\u00e8re.<\/div>\n<div><\/div>\n<div><strong>*Des engins cruciaux pour l\u2019exploration spatiale<\/strong><\/div>\n<div>Ce dernier sera ensuite plac\u00e9 dans la bonne position avant d\u2019\u00eatre largu\u00e9 au sol, sous le rover, qui devra ensuite rouler au-dessus de lui pour s\u2019en \u00e9loigner. Perseverance devra absolument lui d\u00e9gager la vue en moins de 25 heures car l\u2019h\u00e9licopt\u00e8re aura besoin du soleil pour alimenter ses panneaux solaires en \u00e9nergie, et ainsi \u00eatre capable de survivre en se r\u00e9chauffant pendant les glaciales nuits martiennes. Le rover se placera ensuite depuis un point d\u2019observation afin de capturer avec ses cam\u00e9ras les prouesses d\u2019Ingenuity.<\/div>\n<div>Jusqu\u2019\u00e0 cinq vols de difficult\u00e9 graduelle sont planifi\u00e9s, \u00e9tal\u00e9s sur un mois.<\/div>\n<div>Compos\u00e9 de quatre pieds, d\u2019un corps et de deux h\u00e9lices superpos\u00e9es, Ingenuity ne p\u00e8se que 1,8 kg et mesure 1,2 m d\u2019un bout \u00e0 l\u2019autre d\u2019une pale.<\/div>\n<div>Le programme pour cet h\u00e9licopt\u00e8re a co\u00fbt\u00e9 environ 85 millions de dollars \u00e0 la Nasa. \u00c0 l\u2019avenir, de tels engins pourraient se r\u00e9v\u00e9ler cruciaux pour l\u2019exploration des plan\u00e8tes, en \u00e9tant capable de se rendre l\u00e0 o\u00f9 les rovers ne peuvent aller, par exemple au-dessus de canyons.<\/div>\n<div style=\"text-align: right\">(HuffPost, avec AFP)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La Nasa tentera d\u00e9but avril le premier vol d\u2019un engin motoris\u00e9 sur une autre plan\u00e8te, en essayant de faire d\u00e9coller l\u2019h\u00e9licopt\u00e8re Ingenuity sur Mars, a annonc\u00e9 ce mardi 23 mars&hellip;<\/p>\n","protected":false},"author":60,"featured_media":207251,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-207250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monde"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - 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