{"id":33995,"date":"2023-11-23T11:02:30","date_gmt":"2023-11-23T10:02:30","guid":{"rendered":"https:\/\/www.newsendip.com\/?p=33995"},"modified":"2024-07-18T15:33:51","modified_gmt":"2024-07-18T13:33:51","slug":"la-fusee-qui-sest-ecrasee-sur-la-lune-lannee-derniere-serait-chinoise","status":"publish","type":"post","link":"https:\/\/www.newsendip.com\/fr\/la-fusee-qui-sest-ecrasee-sur-la-lune-lannee-derniere-serait-chinoise\/","title":{"rendered":"La fus\u00e9e qui s\u2019est \u00e9cras\u00e9e sur la Lune l\u2019ann\u00e9e derni\u00e8re serait chinoise"},"content":{"rendered":"

Des chercheurs de l\u2019universit\u00e9 de l\u2019Arizona ont publi\u00e9 ce mois-ci un article affirmant que l\u2019\u00e9tage sup\u00e9rieur de la fus\u00e9e chinoise Longue Marche 3C s\u2019est \u00e9cras\u00e9 sur la face cach\u00e9e de la Lune le 4 mars 2022, laissant un double crat\u00e8re de 29 m\u00e8tres de large \u00e0 la surface.<\/p>\n

\"crat\u00e8res
Les crat\u00e8res cr\u00e9\u00e9s sur la Lune par l\u2019impact de ce qui pourrait \u00eatre une fus\u00e9e chinoise | \u00a9 NASA\/GSFC\/Universit\u00e9 d\u2019\u00c9tat de l\u2019Arizona<\/figcaption><\/figure>\n

Le crash en lui m\u00eame n\u2019\u00e9tait pas une surprise, car les astronomes suivaient la trajectoire de la fus\u00e9e depuis des semaines<\/a>. Cependant, l\u2019origine de la fus\u00e9e elle-m\u00eame a fait l\u2019objet d\u2019un d\u00e9bat intense.<\/p>\n

\u00c0 l\u2019origine, les astronomes pensaient que l\u2019impact avait pu \u00eatre caus\u00e9 par une partie de la fus\u00e9e Falcon 9 de Space X qui avait lanc\u00e9 un satellite en f\u00e9vrier 2015 pour observer la Terre.<\/p>\n

Mais la taille du crat\u00e8re a conduit les chercheurs \u00e0 \u00e9carter l\u2019hypoth\u00e8se d\u2019un crash du troisi\u00e8me \u00e9tage de la fus\u00e9e Space X. La fa\u00e7on dont il se d\u00e9pla\u00e7ait et sa composition ont contraint les chercheurs \u00e0 se tourner vers d\u2019autres hypoth\u00e8ses.<\/p>\n

\u00ab\u202fDans cet article, nous pr\u00e9sentons une trajectoire et une analyse spectroscopique utilisant des observations de t\u00e9lescopes terrestres pour montrer de mani\u00e8re concluante que WEO913A est le corps de la fus\u00e9e Longue Marche 3C de la mission Chang\u2019e 5\u2011T1<\/em>\u2033, ont \u00e9crit les chercheurs, dirig\u00e9s par Tanner Campbell, doctorant au d\u00e9partement d\u2019ing\u00e9nierie a\u00e9rospatiale et m\u00e9canique de l\u2019universit\u00e9 de l\u2019Arizona, dans une \u00e9tude publi\u00e9e le 16 novembre dans la revue Planetary Science Journal<\/cite><\/a>.<\/p>\n

Les astronomes s\u2019attendaient \u00e0 ce que l\u2019objet oscille dans l\u2019espace, compte tenu des forces exerc\u00e9es par la gravit\u00e9 de la lune et de la lumi\u00e8re du soleil, mais cet objet a bascul\u00e9 d\u2019un c\u00f4t\u00e9 \u00e0 l\u2019autre de mani\u00e8re stable.<\/p>\n

Il fut donc suppos\u00e9 que la masse \u00e9tait peut-\u00eatre constitu\u00e9e des moteurs de l\u2019\u00e9tage sup\u00e9rieur, qui pesaient un peu plus d\u2019une tonne, car ils ont cr\u00e9\u00e9 un double crat\u00e8re lors de l\u2019impact, ce qui est une premi\u00e8re sur la Lune.<\/p>\n

\u00ab\u202fNous savons que dans le cas de Chang\u2019e 5\u202fT1, l\u2019impact s\u2019est produit presque \u00e0 pic et pour obtenir deux crat\u00e8res de m\u00eame taille, il faut que deux masses \u00e0 peu pr\u00e8s \u00e9gales soient \u00e9loign\u00e9es l\u2019une de l\u2019autre<\/em>\u202f\u00bb, explique M. Campbell.<\/p>\n

L\u2019ann\u00e9e derni\u00e8re, le porte-parole du minist\u00e8re chinois des affaires \u00e9trang\u00e8res, Wang Wenbin, avait ni\u00e9 que la fus\u00e9e Longue Marche avait heurt\u00e9 la Lune, affirmant que les contr\u00f4les internes montraient que l\u2019\u00e9tage sup\u00e9rieur de la fus\u00e9e Chang\u2019e\u20115 avait br\u00fbl\u00e9 en entrant dans l\u2019atmosph\u00e8re de la Terre.<\/p>\n

Mais les observateurs, y compris le commandement spatial am\u00e9ricain, pensent que M. Wang a confondu la mission Chang\u2019e\u20115, destin\u00e9e \u00e0 ramener des \u00e9chantillons lunaires sur Terre, avec la mission d\u2019essai Chang\u2019e\u20115\u202fT\u20111, qui aurait provoqu\u00e9 l\u2019impact. Jusqu\u2019\u00e0 pr\u00e9sent, la Chine n\u2019a pas r\u00e9agi \u00e0 cette derni\u00e8re \u00e9tude.<\/p>\n

Le document souligne \u00e9galement que ses conclusions mettent en \u00e9vidence la n\u00e9cessit\u00e9 croissante les d\u00e9bris de mat\u00e9riel spatial une fois qu\u2019il a rempli sa fonction.<\/p>\n","protected":false},"excerpt":{"rendered":"

Des chercheurs de l\u2019universit\u00e9 de l\u2019Arizona affirment que l\u2019\u00e9tage sup\u00e9rieur de la fus\u00e9e chinoise Longue Marche 3C s\u2019est \u00e9cras\u00e9 sur la face cach\u00e9e de la Lune l\u2019ann\u00e9e derni\u00e8re, laissant un double crat\u00e8re de 29 m\u00e8tres de large \u00e0 la surface.<\/p>\n","protected":false},"author":239,"featured_media":14158,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[412],"tags":[468,421],"class_list":["post-33995","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciences-et-sante","tag-chine","tag-vieux"],"yoast_head":"\nLa fus\u00e9e qui s'est \u00e9cras\u00e9e sur la Lune l'ann\u00e9e derni\u00e8re serait chinoise<\/title>\n<meta name=\"description\" content=\"Des chercheurs de l'universit\u00e9 de l'Arizona affirment que l'\u00e9tage 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