La com\u00e8te 3I\/ATLAS a \u00e9t\u00e9 d\u00e9couverte l’ann\u00e9e derni\u00e8re, croisant dans l’espace du syst\u00e8me solaire, et certains ont pr\u00e9tendu qu’il s’agissait d’un vaisseau spatial contr\u00f4l\u00e9 par des extraterrestres. Toutefois, gr\u00e2ce aux r\u00e9centes observations du JWST, il semble que l’objet spatial ait des origines moins myst\u00e9rieuses. <\/p>\n
Les r\u00e9sultats sugg\u00e8rent que 3I\/ATLAS a commenc\u00e9 sa vie dans une partie froide et lointaine de la Voie lact\u00e9e. Avec des estimations de 10 \u00e0 12 milliards d’ann\u00e9es, l’\u00e2ge de la com\u00e8te est plus de deux fois sup\u00e9rieur \u00e0 celui de la Terre et du syst\u00e8me solaire. L’\u00e2ge de la com\u00e8te 3I\/ATLAS est \u00e9galement proche de celui de la Voie lact\u00e9e (13,6 milliards d’ann\u00e9es) et de l’univers lui-m\u00eame (13,8 milliards d’ann\u00e9es). <\/p>\n
Comment le JWST a fait la d\u00e9couverte<\/p>\n
L’instrument extra-terrestre JWST a recueilli ces nouvelles donn\u00e9es lors d’un survol de la com\u00e8te \u00e0 la fin de l’ann\u00e9e 2025. Il a \u00e9tudi\u00e9 la composition du gaz qui s’est form\u00e9 sur la com\u00e8te lorsque le soleil l’a chauff\u00e9e, provoquant la sublimation de la glace \u00e0 sa surface. <\/p>\n
Selon les estimations pr\u00e9c\u00e9dentes, l’\u00e2ge de 3I\/ATLAS se situe entre 3 et 11 milliards d’ann\u00e9es. Cependant, selon le chercheur Romain Maggiolo, \u00ab\u00a0ils montrent que la composition isotopique de 3I\/ATLAS est tr\u00e8s diff\u00e9rente de celle des com\u00e8tes du syst\u00e8me solaire et sugg\u00e8rent qu’elle s’est probablement form\u00e9e il y a 10 \u00e0 12 milliards d’ann\u00e9es\u00a0\u00bb <\/p>\n
\u00c0 propos de la com\u00e8te 3I\/ATLAS<\/p>\n
On estime que la com\u00e8te mesure 440 m et 5,6 km de large. Les relev\u00e9s du t\u00e9lescope spatial Hubble indiquent qu’elle est entr\u00e9e dans le syst\u00e8me solaire \u00e0 une vitesse d’environ 137 000 mph (221 000 km\/h). 3I\/ATLAS s’est approch\u00e9 au plus pr\u00e8s de la Terre \u00e0 270 millions de kilom\u00e8tres (168 millions de miles), le 19 d\u00e9cembre 2025.<\/p>\n","protected":false},"excerpt":{"rendered":"La com\u00e8te 3I\/ATLAS a \u00e9t\u00e9 d\u00e9couverte l’ann\u00e9e derni\u00e8re, croisant dans l’espace du syst\u00e8me solaire, et certains ont pr\u00e9tendu…\n","protected":false},"author":2,"featured_media":40305,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[70],"tags":[14417,20316,20303,20310,3485,12,13,18,17,20315,19037,20298,20301,20300,20318,20317,20299,10677,20314,1289,20296,20297,20304,1285,20306,20307,12371,20302,20308,1287,20311,3825,20309,1286,73,71,20305,75,72,20312,3073,76,74,20313,1288,19952],"class_list":{"0":"post-40304","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sciences-et-technologies","8":"tag-3i-atlas","9":"tag-age-de-lunivers","10":"tag-age-de-la-comete","11":"tag-analyse-isotopique","12":"tag-astrophysique","13":"tag-be","14":"tag-be-fr","15":"tag-belgique","16":"tag-belgium","17":"tag-chimie-cosmique","18":"tag-comete-interstellaire","19":"tag-comete-la-plus-ancienne","20":"tag-debut-de-lunivers","21":"tag-decouverte-de-lespace","22":"tag-decouverte-de-lespace-par-google","23":"tag-decouverte-de-la-nasa","24":"tag-espace-profond","25":"tag-exploration-spatiale","26":"tag-formation-des-galaxies","27":"tag-informations-sur-des-ordinateurs-portatifs","28":"tag-james-webb-telescope","29":"tag-jwst","30":"tag-nasa-jwst","31":"tag-nouvelles","32":"tag-nouvelles-de-lastronomie","33":"tag-nouvelles-de-la-technologie","34":"tag-objet-interstellaire","35":"tag-origines-cosmiques","36":"tag-passionnes-de-lespace","37":"tag-rapport","38":"tag-rapports-de-deuterium","39":"tag-recherche-scientifique","40":"tag-revendications-de-vaisseaux-spatiaux-extraterrestres","41":"tag-revues","42":"tag-science","43":"tag-science-and-technology","44":"tag-science-de-lespace","45":"tag-sciences","46":"tag-sciences-et-technologies","47":"tag-survol-de-comete","48":"tag-systeme-solaire","49":"tag-technologies","50":"tag-technology","51":"tag-telescope-hubble","52":"tag-test","53":"tag-voie-lactee"},"share_on_mastodon":{"url":"","error":"Validation failed: Text character limit of 500 exceeded"},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/40304","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/comments?post=40304"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/40304\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media\/40305"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media?parent=40304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/categories?post=40304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/tags?post=40304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}