{"id":14332,"date":"2022-09-26T09:48:50","date_gmt":"2022-09-26T07:48:50","guid":{"rendered":"https:\/\/congopubonline.com\/?p=14332"},"modified":"2022-09-27T17:19:11","modified_gmt":"2022-09-27T15:19:11","slug":"mission-dart-la-nasa-va-percuter-un-asteroide-pour-sauver-la-planete","status":"publish","type":"post","link":"https:\/\/congopubonline.com\/?p=14332","title":{"rendered":"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Dans la nuit de lundi \u00e0 mardi, la mission DART de la Nasa tentera de d\u00e9vier la trajectoire de l\u2019ast\u00e9ro\u00efde \u00ab\u00a0Dimorphos\u00a0\u00bb.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ESPACE &#8211; C\u2019est un sc\u00e9nario digne des films\u00a0<em>Armaggedon<\/em>\u00a0et\u00a0<em>Don\u2019t Look Up<\/em>. Que faire si un\u00a0ast\u00e9ro\u00efde\u00a0venait \u00e0 foncer droit sur la Terre\u00a0? Une hypoth\u00e8se s\u00e9rieusement \u00e9tudi\u00e9e par la\u00a0Nasa\u00a0et l\u2019Agence spatiale europ\u00e9enne (ESA), qui y consacrent les missions\u00a0DART\u00a0et HERA,\u00a0<strong>comme vous pouvez le voir dans la vid\u00e9o ci-dessus.<\/strong><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Qu\u2019est-ce que la mission DART&nbsp;?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Cette mission a commenc\u00e9&nbsp;le 24&nbsp;novembre dernier, lorsque l\u2019agence spatiale a envoy\u00e9 un engin dans l\u2019espace \u00e0 bord d\u2019une fus\u00e9e Falcon 9. Ce module doit s\u2019\u00e9craser, dans la nuit du 26 au 27&nbsp;septembre \u00e0 1h14 (heure fran\u00e7aise), \u00e0 une vitesse de 24.000 km\/h sur l\u2019ast\u00e9ro\u00efde Dimorphos, une petite&nbsp;<em>\u00ab&nbsp;lune&nbsp;\u00bb<\/em>&nbsp;qui tourne autour d\u2019un ast\u00e9ro\u00efde plus gros, Didymos, situ\u00e9 \u00e0 11&nbsp;millions de kilom\u00e8tres de la Terre.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u00ab&nbsp;La cible Dimorphos, c\u2019est la taille parfaite pour ce type de mission, parce que c\u2019est vraiment la taille d\u2019un objet qui pourrait nous poser probl\u00e8me un jour<\/em>, d\u00e9taille au&nbsp;<em>HuffPost<\/em>&nbsp;Naomi Murdoch, l\u2019une des scientifiques de la mission DART<em>. Pourquoi&nbsp;? Parce qu\u2019il y a beaucoup d\u2019ast\u00e9ro\u00efdes de cette taille qu\u2019on ne conna\u00eet pas encore et c\u2019est vraiment de l\u00e0 que pourrait venir une menace un jour.&nbsp;\u00bb&nbsp;<\/em>Rassurez-vous, Dimorphos ne repr\u00e9sente pas de menace pour la Terre&nbsp;: son orbite autour du Soleil ne passe, au plus proche, qu\u2019\u00e0 7&nbsp;millions de kilom\u00e8tres de nous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le moment de l\u2019impact entre l\u2019engin envoy\u00e9 par la Nasa et l\u2019ast\u00e9ro\u00efde s\u2019annonce spectaculaire, et pourra \u00eatre suivi en direct sur la cha\u00eene vid\u00e9o de l\u2019agence am\u00e9ricaine. Cette exp\u00e9rience grandeur nature vise \u00e0 modifier la p\u00e9riode de r\u00e9volution du petit ast\u00e9ro\u00efde autour du plus gros.&nbsp;<em>\u00ab&nbsp;En ce moment, \u00e7a prend 11h55 pour que Dimorphos fasse le tour de Didymos. On pense que l\u2019impact DART va diminuer la p\u00e9riode de 10 minutes&nbsp;\u00bb<\/em>, pr\u00e9cise Naomi Murdoch. Ramen\u00e9 au sc\u00e9nario terrestre, l\u2019objectif est de savoir si l\u2019humanit\u00e9 est capable de modifier volontairement la trajectoire d\u2019un ast\u00e9ro\u00efde qui menacerait notre plan\u00e8te.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Une mission spatiale kamikaze<\/strong><\/h5>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/static.lpnt.fr\/images\/2021\/11\/23\/22471284lpw-22471453-article-jpg_8391615_1250x625.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pour atteindre une cible si petite, le vaisseau se dirigera de fa\u00e7on autonome durant les quatre derni\u00e8res heures, comme un missile auto-guid\u00e9.&nbsp;Sa cam\u00e9ra, appel\u00e9e Draco, prendra au dernier moment les toutes premi\u00e8res images de l\u2019ast\u00e9ro\u00efde, dont on ne conna\u00eet pas encore la forme.&nbsp;\u00c0 un rythme d\u2019une image par seconde, visibles en direct sur Terre avec un (petit) d\u00e9lai de 45 secondes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trois minutes apr\u00e8s l\u2019impact, un satellite de la taille d\u2019une bo\u00eete \u00e0 chaussures, appel\u00e9 LICIACube et rel\u00e2ch\u00e9 par le vaisseau il y a quelques jours, passera \u00e0 environ 55&nbsp;km de l\u2019ast\u00e9ro\u00efde pour capturer des images. Elles seront renvoy\u00e9es vers la Terre dans les semaines et mois suivants. Mais pour avoir de v\u00e9ritables donn\u00e9es sur l\u2019impact de DART, il faudra attendre la sonde europ\u00e9enne HERA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette sonde doit d\u00e9coller en octobre&nbsp;2024 pour une arriv\u00e9e en 2026 sur Dimorphos. Objectif&nbsp;: retourner sur la&nbsp;<em>\u00ab&nbsp;sc\u00e8ne du crime&nbsp;\u00bb<\/em>&nbsp;pour \u00e9valuer les cons\u00e9quences de l\u2019impact de DART.&nbsp;<em>\u00ab&nbsp;Elle va nous donner le r\u00e9sultat d\u00e9taill\u00e9 en termes de taille du crat\u00e8re. Mais elle va aussi nous donner pour la premi\u00e8re fois, des informations d\u00e9taill\u00e9es sur la structure interne d\u2019un ast\u00e9ro\u00efde. \u00c7a n\u2019a jamais \u00e9t\u00e9 fait. Et cela gr\u00e2ce \u00e0 un radar dont l\u2019expertise est fran\u00e7aise&nbsp;\u00bb<\/em>, explique Patrick Michel, directeur de recherche au CNRS et responsable scientifique de la mission Hera \u00e0 l\u2019ESA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les scientifiques s\u2019attendent \u00e0 \u00eatre surpris par les r\u00e9sultats des investigations. Car&nbsp;<em>\u00ab&nbsp;on ignore presque tout&nbsp;\u00bb<\/em>&nbsp;de ces corps c\u00e9lestes, indique l\u2019astrophysicien.&nbsp;<em>\u00ab&nbsp;C\u2019est un nouveau monde qu\u2019on va d\u00e9couvrir&nbsp;\u00bb<\/em>. Pour lui, les ast\u00e9ro\u00efdes&nbsp;\u00ab&nbsp;<em>ne sont pas de simples cailloux ennuyeux dans l\u2019espace, mais des petits mondes g\u00e9ologiques fascinants et complexes, avec crat\u00e8res, bassins, champs de roche, \u00e9jections de particules&#8230;<\/em>&nbsp;\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais la science peine \u00e0 appr\u00e9hender ces territoires du fait qu\u2019\u00e0 leur surface, la gravit\u00e9 est tr\u00e8s faible par rapport \u00e0 celle de la Terre&nbsp;: le comportement de la mati\u00e8re y est&nbsp;<em>\u00ab&nbsp;totalement contre-intuitif, on ne peut pas se baser sur des images pour savoir comment les ast\u00e9ro\u00efdes se comportent, il faut aussi les \u2019toucher\u2019&nbsp;\u00bb<\/em>, insiste Patrick Michel.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Remonter aux origines du Syst\u00e8me solaire<\/strong><\/h5>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn-s-www.ledauphine.com\/images\/A26FA9E7-9DD8-4F37-9267-1659091EDF81\/NW_raw\/fotolia-1658397347.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Les syst\u00e8mes binaires, comme Didymos et son satellite Dimorphos, repr\u00e9sentent environ 15% des ast\u00e9ro\u00efdes connus et n\u2019ont jusqu\u2019ici pas \u00e9t\u00e9 explor\u00e9s. Forme, masse, composition chimique, structure interne, r\u00e9sistance au choc, forme du crat\u00e8re caus\u00e9 par DART&nbsp;: les instruments de HERA devraient livrer les secrets de Dimorphos. En fin de mission, un micro-satellite ira m\u00eame se poser \u00e0 sa surface, pour mesurer la mani\u00e8re dont il rebondit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u00ab\u00a0Aujourd\u2019hui, nous sommes dans une \u00e8re o\u00f9 toutes les surfaces solides du Syst\u00e8me solaire ont des crat\u00e8res. Pour retrouver le sc\u00e9nario originel, nous devons comprendre ce qui se passe quand deux corps entrent en collision\u00a0\u00bb<\/em>. Pas en laboratoire, mais \u00e0 \u00e9chelle r\u00e9elle gr\u00e2ce au couple DART-HERA, esp\u00e8rent les scientifiques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>HUFFINGTONPOST via CONGO PUB Online<\/strong><\/em><\/p>\n<div class='epvc-post-count'><span class='epvc-eye'><\/span>  <span class=\"epvc-count\"> 393<\/span><span class='epvc-label'> Vues<\/span><\/div>","protected":false},"excerpt":{"rendered":"<p>Dans la nuit de lundi \u00e0 mardi, la mission DART de la Nasa tentera de d\u00e9vier la trajectoire de l\u2019ast\u00e9ro\u00efde \u00ab\u00a0Dimorphos\u00a0\u00bb. ESPACE &#8211; C\u2019est un sc\u00e9nario digne des films\u00a0Armaggedon\u00a0et\u00a0Don\u2019t Look&hellip;<\/p>\n","protected":false},"author":1,"featured_media":14333,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[61],"tags":[1124],"class_list":["post-14332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-et-tech","tag-mission-dart"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te - Congo Pub Online<\/title>\n<meta name=\"description\" content=\"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/congopubonline.com\/?p=14332\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te\" \/>\n<meta property=\"og:description\" content=\"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te\" \/>\n<meta property=\"og:url\" content=\"https:\/\/congopubonline.com\/?p=14332\" \/>\n<meta property=\"og:site_name\" content=\"Congo Pub Online\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/web.facebook.com\/Congopubonline\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-26T07:48:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-09-27T15:19:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/congopubonline.com\/wp-content\/uploads\/2022\/09\/dart-09-20222.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1060\" \/>\n\t<meta property=\"og:image:height\" content=\"523\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin9775\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@CONGOPUBOnline\" \/>\n<meta name=\"twitter:site\" content=\"@CONGOPUBOnline\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin9775\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332\"},\"author\":{\"name\":\"admin9775\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/#\\\/schema\\\/person\\\/d2f3a940be2e9c1a0e4f8831e203f3cc\"},\"headline\":\"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te\",\"datePublished\":\"2022-09-26T07:48:50+00:00\",\"dateModified\":\"2022-09-27T15:19:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332\"},\"wordCount\":987,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/congopubonline.com\\\/wp-content\\\/uploads\\\/2022\\\/09\\\/dart-09-20222.jpg\",\"keywords\":[\"Mission DART\"],\"articleSection\":[\"Science et Technologie\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/congopubonline.com\\\/?p=14332#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332\",\"url\":\"https:\\\/\\\/congopubonline.com\\\/?p=14332\",\"name\":\"Mission DART\u00a0: la Nasa va percuter un ast\u00e9ro\u00efde pour sauver la plan\u00e8te - 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