{"id":95492,"date":"2025-02-22T13:26:30","date_gmt":"2025-02-22T13:26:30","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/comment-la-terre-se-prepare-face-au-risque-de-collision-dun-asteroide"},"modified":"2025-02-22T13:26:30","modified_gmt":"2025-02-22T13:26:30","slug":"comment-la-terre-se-prepare-face-au-risque-de-collision-dun-asteroide","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/comment-la-terre-se-prepare-face-au-risque-de-collision-dun-asteroide","title":{"rendered":"Comment la Terre se pr\u00e9pare face au risque de collision d&rsquo;un ast\u00e9ro\u00efde"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Depuis plusieurs anne\u0301es, les agences spatiales travaillent a\u0300 de\u0301fendre la Terre contre le risque de collision d&rsquo;un aste\u0301roi\u0308de tel que YR4, qui a une faible probabilite\u0301 de percuter notre plane\u0300te en 2032. Voici un tour d&rsquo;horizon des strate\u0301gies e\u0301tudie\u0301es.<\/p>\n<p>Estime\u0301 entre 40 et 90 me\u0300tres de large, YR4 a 3,1% de chances de frapper la Terre le 22 de\u0301cembre 2032, selon les calculs rendus publics mardi par la Nasa.<\/p>\n<p>C&rsquo;est le niveau le plus e\u0301leve\u0301 jamais enregistre\u0301 depuis le de\u0301but de la surveillance des aste\u0301roi\u0308des. Mais cette pre\u0301vision est a\u0300 prendre avec des pincettes car elle est fonde\u0301e sur des donne\u0301es pre\u0301liminaires et est amene\u0301e a\u0300 e\u0301voluer &#8211; probablement a\u0300 la baisse &#8211; dans les semaines et mois qui viennent, insistent des experts interroge\u0301s par l&rsquo;AFP.<\/p>\n<p>Me\u0302me dans le cas hypothe\u0301tique ou\u0300 la probabilite\u0301 d&rsquo;une collision grimperait a\u0300 100%, \u00ab\u00a0nous ne sommes pas sans de\u0301fense\u00a0\u00bb, souligne aupre\u0300s de l&rsquo;AFP Richard Moissl, chef du bureau de de\u0301fense plane\u0301taire de l&rsquo;Agence spatiale europe\u0301enne (ESA).<\/p>\n<p>&#8211; De\u0301vie\u0301 par un vaisseau spatial &#8211;<\/p>\n<p>Pour tester la de\u0301fense plane\u0301taire contre ce type de danger, la Nasa a de\u0301libe\u0301re\u0301ment envoye\u0301 en 2022 un vaisseau percuter Dimorphos, un aste\u0301roi\u0308de de 160 me\u0300tres de diame\u0300tre qui ne repre\u0301sentait pas de danger pour la Terre.<\/p>\n<p>La mission DART est effectivement parvenue a\u0300 de\u0301placer l&rsquo;aste\u0301roi\u0308de et une autre mission, Hera, a de\u0301colle\u0301 en octobre dernier pour e\u0301tudier les effets de l&rsquo;impact sur sa structure.<\/p>\n<p>La technique pourrait e\u0302tre utilise\u0301e pour percuter YR4 a\u0300 plusieurs reprises, en observant a\u0300 chaque fois la fac\u0327on dont cela affecte sa trajectoire, estime Bruce Betts, scientifique de l&rsquo;organisation ame\u0301ricaine Planetary Society.<\/p>\n<p>&#8211; Tracteur, ions et peinture &#8211;<\/p>\n<p>Des me\u0301thodes plus subtiles, qui ne\u0301cessitent une intervention suffisamment pre\u0301coce, ont e\u0301te\u0301 envisage\u0301es par les scientifiques.<\/p>\n<p>L&rsquo;une d&rsquo;elles, appele\u0301e \u00ab\u00a0tracteur gravitationnel\u00a0\u00bb, consiste a\u0300 envoyer un grand vaisseau a\u0300 proximite\u0301 du corps ce\u0301leste et &#8211; sans le toucher &#8211; a\u0300 utiliser l&rsquo;attraction gravitationnelle pour modifier son orbite.<\/p>\n<p>Une strate\u0301gie alternative serait de placer a\u0300 faible distance de l&rsquo;aste\u0301roi\u0308de un engin spatial e\u0301quipe\u0301 de propulseurs qui e\u0301jecteraient \u00ab\u00a0un flux constant d&rsquo;ions\u00a0\u00bb ayant aussi pour effet de de\u0301vier sa trajectoire, indique M. Moissl.<\/p>\n<p>Autre me\u0301thode douce: peindre en blanc une des faces du corps ce\u0301leste pour utiliser l'\u00a0\u00bbeffet Yarkovsky\u00a0\u00bb, une tre\u0300s faible pousse\u0301e produite par l&rsquo;e\u0301cart entre l&rsquo;absorption solaire et l&rsquo;e\u0301mission thermique par rayonnement. Ce qui la\u0300 aussi modifierait le\u0301ge\u0300rement sa trajectoire.<\/p>\n<p>&#8211; Bombe atomique et lasers &#8211;<\/p>\n<p>L&rsquo;anne\u0301e dernie\u0300re, des chercheurs ame\u0301ricains ont teste\u0301 en laboratoire sur une maquette d&rsquo;aste\u0301roi\u0308de de la taille d&rsquo;une bille la possibilite\u0301 de faire exploser une bombe nucle\u0301aire a\u0300 proximite\u0301. Ce qui aurait pour effet de vaporiser sa surface et de le propulser dans la direction oppose\u0301e.<\/p>\n<p>Envoyer des armes nucle\u0301aires dans l&rsquo;espace est conside\u0301re\u0301 comme une solution de dernier ressort pour faire face a\u0300 des aste\u0301roi\u0308des d&rsquo;au moins un kilome\u0300tre de diame\u0300tre, susceptibles de de\u0301clencher une catastrophe globale comme l&rsquo;extinction des dinosaures.<\/p>\n<p>Une ide\u0301e similaire consiste a\u0300 bombarder l&rsquo;aste\u0301roi\u0308de avec des faisceaux lasers depuis un engin spatial pour vaporiser une de ses faces et le repousser.<\/p>\n<p>Des expe\u0301riences mene\u0301es en laboratoire sugge\u0300rent que cette me\u0301thode est viable mais elle ne fait pas partie des \u00ab\u00a0techniques principales\u00a0\u00bb e\u0301tudie\u0301es, selon M. Betts.<\/p>\n<p>&#8211; Et si rien ne marche ? &#8211;<\/p>\n<p>Si cela s&rsquo;ave\u0300re ne\u0301cessaire, de\u0301vier YR4 est donc \u00ab\u00a0faisable, mais cela de\u0301pend de la rapidite\u0301 avec laquelle nous agissons en tant que plane\u0300te\u00a0\u00bb, souligne M. Moissl.<\/p>\n<p>Les agences spatiales et les scientifiques e\u0301mettront des recommandations, mais la de\u0301cision finale sur la manie\u0300re de ge\u0301rer l&rsquo;objet reviendrait aux dirigeants mondiaux.<\/p>\n<p>Si toutes les options e\u0301chouent, nous aurons en tout e\u0301tat de cause une ide\u0301e assez pre\u0301cise de la zone d&rsquo;impact de l&rsquo;aste\u0301roi\u0308de qui n&rsquo;est pas un \u00ab\u00a0tueur de plane\u0300te\u00a0\u00bb et qui pourrait, au pire, menacer une ville, selon M. Moissl.<\/p>\n<p>Cela signifie que la pre\u0301paration a\u0300 l&rsquo;impact, incluant potentiellement une e\u0301vacuation si la zone est habite\u0301e, constituera la dernie\u0300re ligne de de\u0301fense.<\/p>\n<p>\u00ab\u00a0Sept ans et demi, c&rsquo;est long pour se pre\u0301parer\u00a0\u00bb, estime Moissl, rappelant qu&rsquo;il y a environ 97% de chances que l&rsquo;aste\u0301roi\u0308de manque la Terre.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Depuis plusieurs anne\u0301es, les agences spatiales travaillent a\u0300 de\u0301fendre la Terre contre le risque de collision d&rsquo;un aste\u0301roi\u0308de tel que YR4, qui a une faible probabilite\u0301 de percuter notre plane\u0300te en 2032. Voici un tour d&rsquo;horizon des strate\u0301gies e\u0301tudie\u0301es. Estime\u0301 entre 40 et 90 me\u0300tres de large, YR4 a 3,1% de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":95491,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-95492","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Comment la Terre se pr\u00e9pare face au risque de collision d&#039;un ast\u00e9ro\u00efde - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/comment-la-terre-se-prepare-face-au-risque-de-collision-dun-asteroide\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment la Terre se pr\u00e9pare face au risque de collision d&#039;un ast\u00e9ro\u00efde\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Depuis plusieurs anne\u0301es, les agences spatiales travaillent a\u0300 de\u0301fendre la Terre contre le risque de collision d&rsquo;un aste\u0301roi\u0308de tel que YR4, qui a une faible probabilite\u0301 de percuter notre plane\u0300te en 2032. Voici un tour d&rsquo;horizon des strate\u0301gies e\u0301tudie\u0301es. 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Depuis plusieurs anne\u0301es, les agences spatiales travaillent a\u0300 de\u0301fendre la Terre contre le risque de collision d&rsquo;un aste\u0301roi\u0308de tel que YR4, qui a une faible probabilite\u0301 de percuter notre plane\u0300te en 2032. Voici un tour d&rsquo;horizon des strate\u0301gies e\u0301tudie\u0301es. 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