{"id":10924,"date":"2023-12-29T16:27:51","date_gmt":"2023-12-29T16:27:51","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/dieu-du-chaos-la-nasa-scrute-lasteroide-apophis-en-approche-de-la-terre"},"modified":"2023-12-29T17:46:10","modified_gmt":"2023-12-29T17:46:10","slug":"dieu-du-chaos-la-nasa-scrute-lasteroide-apophis-en-approche-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/dieu-du-chaos-la-nasa-scrute-lasteroide-apophis-en-approche-de-la-terre","title":{"rendered":"\u201cDieu du Chaos\u201d : la Nasa scrute l\u2019ast\u00e9ro\u00efde Apophis, en approche de la Terre"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Un vaisseau spatial de la Nasa, re\u0301cemment revenu d\u2019une mission sur l\u2019aste\u0301roi\u0308de Bennu, a e\u0301te\u0301 relance\u0301 pour e\u0301tudier son confre\u0300re Apophis, du nom du dieu e\u0301gyptien du Chaos, alors que ce dernier se rapproche de l\u2019orbite terrestre. Le corps rocheux devrait passer, le 13 avril 2029, a\u0300 moins de 32 000 km de la surface du globe.<\/p>\n

Son nom n\u2019est pas des plus rassurants. Alors que l\u2019aste\u0301roi\u0308de baptise\u0301 Apophis, du nom du dieu e\u0301gyptien du Chaos, s\u2019approche de l\u2019orbite terrestre, un engin spatial de la Nasa, re\u0301cemment revenu de l\u2019espace, a e\u0301te\u0301 relance\u0301 pour une mission d\u2019e\u0301tude de ce rocher d\u2019environ 370 me\u0300tres de diame\u0300tre, a annonce\u0301 vendredi 22 de\u0301cembre l\u2019agence spatiale ame\u0301ricaine.<\/p>\n

Le rendez-vous est fixe\u0301 au 13 avril 2029. Il reste donc un peu plus de cinq ans avant que le corps rocheux d\u2019environ 40 a\u0300 50 millions de tonnes ne s\u2019approche de la plane\u0300te bleue, a\u0300 une distance infe\u0301rieure a\u0300 celle qui nous se\u0301pare de certains satellites artificiels. Un survol extre\u0302mement rapproche\u0301 qui, comme le rappelle la Nasa, ne s\u2019est jamais produit dans l\u2019histoire depuis que l\u2019humanite\u0301 est en mesure d\u2019observer et d\u2019enregistrer ce type de phe\u0301nome\u0300nes astronomiques.<\/p>\n

Si dans la mythologie e\u0301gyptienne, Apophis, dieu a\u0300 forme de serpent et incarnation des te\u0301ne\u0300bres et de la fin du monde, cherche a\u0300 ane\u0301antir la cre\u0301ation divine, l\u2019aste\u0301roi\u0308de qui porte son nom n\u2019a cependant pas pareil projet pour la Terre. Mais son passage, pre\u0301vu a\u0300 moins de 32 000 km de la surface du globe pourrait le rendre visible a\u0300 l\u2019\u0153il nu dans l\u2019he\u0301misphe\u0300re oriental (couvrant le continent asiatique, l\u2019oce\u0301an Indien, l\u2019Australie, la plupart du continent africain et du continent europe\u0301en, une partie de l\u2019oce\u0301an Pacifique et de l\u2019Antarctique).<\/p>\n

Expliquer l\u2019avant, anticiper l\u2019apre\u0300s<\/b><\/p>\n

Apre\u0300s un voyage de sept ans et de 4 milliards de kilome\u0300tres, le vaisseau spatial OSIRIS-REx \u2013 qui a rapporte\u0301 en septembre dernier un e\u0301chantillon de l\u2019aste\u0301roi\u0308de Bennu \u2013 disposait encore de carburant et est ainsi reparti en mission vers Apophis. Cou\u0302t de la prolongation de la mission: 200 milliards de dollars.<\/p>\n

Plusieurs autres destinations avaient e\u0301te\u0301 envisage\u0301es, a\u0300 l\u2019instar de Ve\u0301nus, mais c\u2019est Apophis qui a e\u0301te\u0301 retenu. Un aste\u0301roi\u0308de de type \u201cS\u201d, compose\u0301 de mate\u0301riaux silicate\u0301s et de nickel-fer, qui se distingue des aste\u0301roi\u0308des de type \u201cC\u201d, riches en carbone comme l\u2019est Bennu. Le vaisseau spatial a e\u0301te\u0301 rebaptise\u0301 pour l\u2019occasion OSIRIS-APEX (Origins, Spectral Interpretation, Resource Identification, and Security \u2013 Apophis Explorer).<\/p>\n

Le 13 avril 2029, Apophis longera la Terre et sera alors accompagne\u0301 en permanence par le vaisseau qui s\u2019approchera jusqu\u2019a\u0300 25 me\u0300tres de sa surface pour en extraire un maximum d\u2019informations, afin d\u2019e\u0301tudier notamment \u201ccomment la surface se modifie en interagissant avec la gravite\u0301 terrestre\u201d, a annonce\u0301 Amy Simon, responsable scientifique de la mission au Goddard Space Flight Center de la Nasa a\u0300 Greenbelt, dans le Maryland.<\/p>\n

Ainsi que l\u2019explique la Nasa, \u201cla rencontre rapproche\u0301e d\u2019Apophis avec la Terre modifiera l\u2019orbite de l\u2019aste\u0301roi\u0308de et la dure\u0301e de sa journe\u0301e de 30,6 heures\u201d. Cette rencontre pourrait alors provoquer des tremblements de terre et des glissements de terrain a\u0300 la surface de l\u2019aste\u0301roi\u0308de, qui permettront dans ce cas de remuer de la matie\u0300re.<\/p>\n

\u201cNous savons que les forces de mare\u0301e et l\u2019accumulation de de\u0301bris sont des processus fondamentaux qui pourraient jouer un ro\u0302le dans la formation des plane\u0300tes\u201d, explique Dani Mendoza DellaGiustina, chercheuse principale de la mission d\u2019OSIRIS-APEX a\u0300 l\u2019universite\u0301 de Tucson, en Arizona. \u201cIls pourraient nous e\u0301clairer sur la fac\u0327on dont nous sommes passe\u0301s des de\u0301bris du syste\u0300me solaire primitif a\u0300 des plane\u0300tes a\u0300 part entie\u0300re\u201d.<\/p>\n

Alors que la plupart des aste\u0301roi\u0308des potentiellement dangereux connus (dont l\u2019orbite s\u2019approche a\u0300 moins de 4,6 millions de kilome\u0300tres de la Terre) sont e\u0301galement de type \u201cS\u201d, l\u2019exploration d\u2019Apophis pourrait contribuer a\u0300 la recherche en matie\u0300re de de\u0301fense plane\u0301taire, priorite\u0301 absolue pour la Nasa.<\/p>\n

L\u2019hypothe\u0300se d\u2019une collision avec la Terre e\u0301carte\u0301e<\/b><\/p>\n

La de\u0301couverte \u2013 en 2004 a\u0300 l\u2019observatoire de Kitt Peak (Arizona) \u2013 du gigantesque ae\u0301rolithe \u201cDieu du Chaos\u201d, a d\u2019abord suscite\u0301 l\u2019inquie\u0301tude, et nourrit encore aujourd\u2019hui quelques the\u0301ories disse\u0301mine\u0301es c\u0327a\u0300-et-la\u0300 sur les re\u0301seaux sociaux concernant une pre\u0301tendue collision avec la Terre. \u201cApophis arrive, c\u2019est pour c\u0327a qu\u2019ils construisent leurs bunkers\u201d, peut-on notamment lire d\u2019un utilisateur de X (ex-Twitter).<\/p>\n

Dans les premiers temps de son e\u0301tude, l\u2019aste\u0301roi\u0308de avait e\u0301te\u0301 classe\u0301 au niveau 4 sur l\u2019e\u0301chelle de Turin (servant a\u0300 cate\u0301goriser de 0 a\u0300 10 les risques d\u2019impacts d\u2019objets ge\u0301ocroiseurs, tels les aste\u0301roi\u0308des ou les come\u0300tes), ce qui en faisait un cas unique.<\/p>\n

Mais en de\u0301cembre 2004, quelques mois seulement apre\u0300s la de\u0301couverte de l\u2019aste\u0301roi\u0308de, la communaute\u0301 scientifique avait de\u0301montre\u0301 qu\u2019il e\u0301tait finalement tre\u0300s improbable que celui-ci ne vienne jouer les trouble-fe\u0302te.<\/p>\n

Plus encore, en juin 2021, le passage d\u2019Apophis a\u0300 seulement 17 millions de kilome\u0300tres de la Terre a permis d\u2019e\u0301carter de\u0301finitivement l\u2019hypothe\u0300se d\u2019une collision, la Nasa assurant que son orbite permettait avec certitude d\u2019exclure tout impact pour au moins les cent prochaines anne\u0301es au minimum.<\/p>\n

Balayant un de\u0301nouement fac\u0327on \u201cDon\u2019t Look Up\u201d, le Centre d\u2019e\u0301tude des objets proches de la Terre de la Nasa a me\u0302me officiellement raye\u0301 Apophis de la liste des corps ce\u0301lestes a\u0300 risque.<\/p>\n

Apre\u0300s le passage de l\u2019aste\u0301roi\u0308de pre\u0300s de la Terre, OSIRIS-APEX ope\u0300rera a\u0300 proximite\u0301 de celui-ci pendant les 18 mois suivants pour e\u0301tudier notamment les changements cause\u0301s a\u0300 Apophis par sa proximite\u0301 avec la Terre.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. Un vaisseau spatial de la Nasa, re\u0301cemment revenu d\u2019une mission sur l\u2019aste\u0301roi\u0308de Bennu, a e\u0301te\u0301 relance\u0301 pour e\u0301tudier son confre\u0300re Apophis, du nom du dieu e\u0301gyptien du Chaos, alors que ce dernier se rapproche de l\u2019orbite terrestre. Le corps rocheux devrait passer, le 13 avril 2029, a\u0300 moins de […]<\/p>\n","protected":false},"author":82,"featured_media":10923,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10924","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\n\u201cDieu du Chaos\u201d : la Nasa scrute l\u2019ast\u00e9ro\u00efde Apophis, en approche de la Terre - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Un vaisseau spatial de la Nasa, re\u0301cemment revenu d\u2019une mission sur l\u2019aste\u0301roi\u0308de Bennu, a e\u0301te\u0301 relance\u0301 pour e\u0301tudier ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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