{"id":26015,"date":"2022-10-15T11:52:52","date_gmt":"2022-10-15T11:52:52","guid":{"rendered":"https:\/\/www.africa-press.net\/mali\/politique\/la-mission-dart-de-la-nasa-a-reussi-a-devier-lasteroide-didymos-de-sa-trajectoire"},"modified":"2022-10-15T12:58:22","modified_gmt":"2022-10-15T12:58:22","slug":"la-mission-dart-de-la-nasa-a-reussi-a-devier-lasteroide-didymos-de-sa-trajectoire","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mali\/divers\/la-mission-dart-de-la-nasa-a-reussi-a-devier-lasteroide-didymos-de-sa-trajectoire","title":{"rendered":"La mission \u201cDart\u201d de la Nasa a r\u00e9ussi \u00e0 d\u00e9vier l\u2019ast\u00e9ro\u00efde Didymos de sa trajectoire"},"content":{"rendered":"

Africa-Press – Mali. <\/strong><\/span>La nasa confirme que son vaisseau a bien de\u0301vie\u0301 l\u2019aste\u0301roi\u0308de Dimorphos, percute\u0301 fin septembre dans un test de de\u0301fense de la Terre.<\/p>\n

L\u2019agence spatiale ame\u0301ricaine a re\u0301ussi a\u0300 de\u0301vier un aste\u0301roi\u0308de de sa trajectoire en projetant fin septembre un vaisseau contre sa surface lors d\u2019une mission test ine\u0301dite, qui doit permettre a\u0300 l\u2019humanite\u0301 d\u2019apprendre a\u0300 se prote\u0301ger d\u2019une e\u0301ventuelle menace future, a annonce\u0301 mardi la Nasa.<\/p>\n

Le vaisseau de la mission Dart avait volontairement percute\u0301 sa cible, l\u2019aste\u0301roi\u0308de Dimorphos, qui est le satellite d\u2019un aste\u0301roi\u0308de plus grand nomme\u0301 Didymos. L\u2019appareil de la Nasa est ainsi parvenu a\u0300 le de\u0301placer, en re\u0301duisant son orbite de 32 minutes, a indique\u0301 le chef de l\u2019agence spatiale, Bill Nelson, lors d\u2019une confe\u0301rence de presse.<\/p>\n

De\u0301fendre la plane\u0300te<\/p>\n

C\u2019est \u00ab un moment de\u0301cisif pour la de\u0301fense plane\u0301taire, et un moment de\u0301cisif pour l\u2019humanite\u0301 \u00bb, a-t-il salue\u0301.<\/p>\n

Cela aurait de\u0301ja\u0300 e\u0301te\u0301 \u00ab conside\u0301re\u0301 comme un e\u0301norme succe\u0300s s\u2019il (le vaisseau) avait seulement re\u0301duit l\u2019orbite d\u2019environ 10 minutes. Mais il l\u2019a en fait re\u0301duite de 32 minutes \u00bb, a-t-il ajoute\u0301. Avec cette mission, \u00ab la Nasa a prouve\u0301 que nous e\u0301tions se\u0301rieux en tant que de\u0301fenseurs de la plane\u0300te \u00bb, a-t-il affirme\u0301.<\/p>\n

Dimorphos, situe\u0301 a\u0300 quelque 11 millions de kilome\u0300tres de la Terre au moment de l\u2019impact, mesure environ 160 me\u0300tres de diame\u0300tre et ne repre\u0301sente aucun danger pour notre plane\u0300te.<\/p>\n

Il faisait jusqu\u2019ici le tour de Didymos en 11 heures et 55 minutes, une pe\u0301riode raccourcie a\u0300 11 heures et 23 minutes, a pre\u0301cise\u0301 M. Nelson.<\/p>\n

\u00ab Cela ressemble a\u0300 un sce\u0301nario de film. Mais ce n\u2019est pas Hollywood […]. Cette mission montre que la Nasa essaie d\u2019e\u0302tre pre\u0302te face a\u0300 tout ce que l\u2019univers pourrait nous envoyer \u00bb, a-t-il de\u0301clare\u0301.<\/p>\n

Un entrai\u0302nement pour la Nasa<\/p>\n

Si l\u2019objectif restait relativement modeste compare\u0301 aux sce\u0301narios catastrophe de films de science-fiction comme Armageddon, cette mission ine\u0301dite de \u00ab de\u0301fense plane\u0301taire \u00bb, nomme\u0301e Dart (fle\u0301chette, en anglais), est la premie\u0300re a\u0300 tester une telle technique. Elle permet a\u0300 la Nasa de s\u2019entrai\u0302ner au cas ou\u0300 un aste\u0301roi\u0308de menacerait un jour de frapper la Terre.<\/p>\n

Pour confirmer que la trajectoire de l\u2019aste\u0301roi\u0308de a bien e\u0301te\u0301 alte\u0301re\u0301e, il a fallu attendre que les scientifiques analysent les donne\u0301es de te\u0301lescopes au sol. Ces derniers ont observe\u0301 la variation de l\u2019e\u0301clat lorsque le petit aste\u0301roi\u0308de passe devant et derrie\u0300re le gros.<\/p>\n

Rapidement apre\u0300s la collision, de premie\u0300res images \u2013 prises par des te\u0301lescopes au sol et le nano-satellite embarque\u0301 pour la mission LICIACube \u2013 avaient montre\u0301 un vaste nuage de poussie\u0300re autour de Dimorphos, s\u2019e\u0301tendant sur des milliers de kilome\u0300tres.<\/p>\n

Puis les te\u0301lescopes James Webb et Hubble, les plus puissants observatoires spatiaux, ont re\u0301ve\u0301le\u0301 les vues de\u0301taille\u0301es de l\u2019impact du vaisseau de la Nasa, montrant notamment le mouvement des e\u0301jectas, la matie\u0300re arrache\u0301e a\u0300 l\u2019astre.<\/p>\n

Mieux connai\u0302tre ces aste\u0301roi\u0308des<\/p>\n

Tout ceci doit permettre de mieux comprendre la composition de Dimorphos, repre\u0301sentatif d\u2019une population d\u2019aste\u0301roi\u0308des assez communs, et donc de mesurer l\u2019effet exact que cette technique \u2013 dite a\u0300 impact cine\u0301tique \u2013 peut avoir sur eux.<\/p>\n

Des images de Dimorphos, prises peu avant l\u2019impact, montrent que sa surface est grise et rocailleuse et qu\u2019il a une forme d\u2019\u0153uf.<\/p>\n

Connai\u0302tre ces de\u0301tails est important au cas ou\u0300 l\u2019humanite\u0301 se trouverait un jour oblige\u0301e de percuter un objet approchant la Terre.<\/p>\n

Le vaisseau avait voyage\u0301 durant dix mois depuis son de\u0301collage, en Californie.<\/p>\n

Pre\u0300s de 30 000 aste\u0301roi\u0308des de toutes tailles ont e\u0301te\u0301 catalogue\u0301s dans les environs de la Terre (on les appelle des ge\u0301ocroiseurs, c\u2019est-a\u0300-dire que leur orbite croise celle de notre plane\u0300te).<\/p>\n

Aujourd\u2019hui, aucun de ces aste\u0301roi\u0308des connus ne menace notre plane\u0300te pour les 100 prochaines anne\u0301es. Sauf qu\u2019ils ne sont pas encore tous recense\u0301s.<\/p>\n

Ceux d\u2019un kilome\u0300tre et plus ont quasiment tous e\u0301te\u0301 repe\u0301re\u0301s, selon les scientifiques. Mais ils estiment n\u2019avoir connaissance que de 40 % des aste\u0301roi\u0308des mesurant 140 me\u0300tres et plus, ceux capables de de\u0301vaster une re\u0301gion entie\u0300re.<\/p>\n

Pour plus d’informations et d’analyses sur la Mali<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Mali. La nasa confirme que son vaisseau a bien de\u0301vie\u0301 l\u2019aste\u0301roi\u0308de Dimorphos, percute\u0301 fin septembre dans un test de de\u0301fense de la Terre. L\u2019agence spatiale ame\u0301ricaine a re\u0301ussi a\u0300 de\u0301vier un aste\u0301roi\u0308de de sa trajectoire en projetant fin septembre un vaisseau contre sa surface lors d\u2019une mission test ine\u0301dite, qui doit permettre a\u0300 […]<\/p>\n","protected":false},"author":82,"featured_media":26014,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,17],"tags":[76,86,19],"class_list":["post-26015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-mali","tag-mali"],"yoast_head":"\nLa mission \u201cDart\u201d de la Nasa a r\u00e9ussi \u00e0 d\u00e9vier l\u2019ast\u00e9ro\u00efde Didymos de sa trajectoire - Mali<\/title>\n<meta name=\"description\" content=\"La nasa confirme que son vaisseau a bien de\u0301vie\u0301 l\u2019aste\u0301roi\u0308de Dimorphos, percute\u0301 fin 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