{"id":8415,"date":"2023-04-12T18:31:10","date_gmt":"2023-04-12T18:31:10","guid":{"rendered":"https:\/\/www.africa-press.net\/comores\/politique\/la-mission-juice-part-explorer-les-lunes-glacees-de-jupiter-en-quete-de-vie-extraterrestre"},"modified":"2023-04-12T18:41:16","modified_gmt":"2023-04-12T18:41:16","slug":"la-mission-juice-part-explorer-les-lunes-glacees-de-jupiter-en-quete-de-vie-extraterrestre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/comores\/toutes-les-actualites\/la-mission-juice-part-explorer-les-lunes-glacees-de-jupiter-en-quete-de-vie-extraterrestre","title":{"rendered":"La mission Juice part explorer les lunes glac\u00e9es de Jupiter en qu\u00eate de vie extraterrestre"},"content":{"rendered":"

Africa-Press – Comores. <\/strong><\/span>Sous leur banquise se meuvent de vastes oce\u0301ans d\u2019eau liquide, terrains propices a\u0300 l\u2019e\u0301mergence de la vie : l\u2019exploration des lunes glace\u0301es de Jupiter, destination de la mission Juice, ouvre un nouveau chapitre dans la que\u0302te de mondes extraterrestres habitables.<\/p>\n

Ces milieux sont si e\u0301loigne\u0301s du Soleil que les astronomes les ont longtemps exclus de la zone du syste\u0300me solaire conside\u0301re\u0301e comme habitable, \u201cqui jusqu\u2019a\u0300 encore re\u0301cemment s\u2019arre\u0302tait a\u0300 Mars\u201d, explique a\u0300 l\u2019AFP l\u2019astrophysicienne Athe\u0301na Coustenis, l\u2019une des responsables scientifiques de la sonde europe\u0301enne.<\/p>\n

Les de\u0301couvertes par les sondes Galileo (1995) autour de Jupiter, et Cassini (2004) autour de Saturne, ont repousse\u0301 les frontie\u0300res de la recherche. Qui se focalise non sur ces plane\u0300tes ge\u0301antes, gazeuses donc non propices a\u0300 la vie, mais sur leurs lunes glace\u0301es : Europe et Ganyme\u0300de pour Jupiter ; Encelade et Titan pour Saturne.<\/p>\n

Leur atout majeur : abriter sous leur surface de glace des oce\u0301ans d\u2019eau liquide \u2013 seule l\u2019eau a\u0300 l\u2019e\u0301tat liquide rendant la vie possible.<\/p>\n

\u201cC\u2019est la premie\u0300re fois qu\u2019on va explorer des habitats au-dela\u0300 de la ligne de gel, la\u0300 ou\u0300 l\u2019eau liquide ne peut plus exister en surface\u201d, se fe\u0301licitait Nicolas Altobelli, responsable de Juice pour l\u2019Agence spatiale europe\u0301enne (ESA), en janvier chez Airbus a\u0300 Toulouse, ou\u0300 la sonde a e\u0301te\u0301 conc\u0327ue.<\/p>\n

La sonde Juice, exploratrice des lunes glace\u0301es de Jupiter. \u00a9 Paz Pizarro, AFP<\/p>\n

La future mission de la Nasa Europa Clipper visera Europe. Juice, elle, mise sur Ganyme\u0300de : en 2034, elle devrait se placer en orbite autour de ce satellite naturel, le plus gros du syste\u0300me solaire. C\u2019est aussi la seule lune a\u0300 posse\u0301der son propre champ magne\u0301tique, la prote\u0301geant des dangereuses radiations.<\/p>\n

Oce\u0301an \u201cgigantesque\u201d<\/b><\/p>\n

Autant de caracte\u0301ristiques sugge\u0301rant un environnement stabilise\u0301, autre condition a\u0300 l\u2019e\u0301mergence du vivant… et a\u0300 son maintien. Car \u201cle tout n\u2019est pas que la vie apparaisse, mais qu\u2019elle subsiste\u201d, souligne Athe\u0301na Coustenis, chercheuse CNRS au laboratoire Lesia de l\u2019Observatoire de Paris-PSL.<\/p>\n

Contrairement aux missions sur Mars, en que\u0302te des traces d\u2019une vie ancienne aujourd\u2019hui disparue, l\u2019exploration des lunes glace\u0301es cherche des environnements encore habitables. Ce que n\u2019est plus la plane\u0300te rouge.<\/p>\n

Image du te\u0301lescope Hubble fournie par la Nasa en de\u0301cembre 2008 et montrant Jupiter et sa lune Ganyme\u0300de. \u00a9 Nasa, AFP (archives)<\/p>\n

L\u2019habitabilite\u0301 requiert aussi une source d\u2019e\u0301nergie. Sous les tempe\u0301ratures glaciales du syste\u0300me jovien, elle ne provient pas du Soleil, mais de la gravite\u0301 que Jupiter exerce sur ses satellites : des \u201ceffets de mare\u0301e\u201d semblables a\u0300 ce qui se passe sur Terre avec sa lune.<\/p>\n

Ce phe\u0301nome\u0300ne permet de \u201cdissiper la chaleur a\u0300 l\u2019inte\u0301rieur des lunes et de maintenir l\u2019eau a\u0300 l\u2019e\u0301tat liquide\u201d, de\u0301crypte Francis Rocard, plane\u0301tologue au Centre national d\u2019e\u0301tudes spatiales (Cnes).<\/p>\n

L\u2019oce\u0301an de Ganyme\u0300de est \u201cgigantesque\u201d, de\u0301crit Carole Larigauderie, cheffe du projet Juice au Cnes. Pie\u0301ge\u0301 entre deux e\u0301paisses couches de glace, il serait profond de plusieurs dizaines de kilome\u0300tres. \u201cSur Terre, on arrive a\u0300 trouver des formes de vie au fond des abysses\u201d, remarque-t-elle. Certains e\u0301cosyste\u0300mes terrestres sont en effet capables de se maintenir sans lumie\u0300re et grouillent de micro-organismes comme des bacte\u0301ries ou des arche\u0301es.<\/p>\n

Missions comple\u0301mentaires<\/b><\/p>\n

Un tel e\u0301cosyste\u0300me a besoin de nutriments pour se maintenir. \u201cToute la question est donc de savoir si l\u2019oce\u0301an de Ganyme\u0300de en contient\u201d, selon Athe\u0301na Coustenis. Il faudrait par exemple que l\u2019oce\u0301an puisse absorber des composants de\u0301pose\u0301s a\u0300 la surface, pour e\u0302tre ensuite dissous dans l\u2019eau, poursuit l\u2019astrophysicienne.<\/p>\n

Les instruments de Juice inspecteront cet oce\u0301an sous toutes ses coutures pour e\u0301valuer sa profondeur, sa distance de la surface et, espe\u0300re-t-on, sa composition.<\/p>\n

Vue artistique fournie par la Nasa et l\u2019ESA en 2015, repre\u0301sentant Ganyme\u0300de orbitant autour de Jupiter. \u00a9 Nasa \/ ESA, AFP (archives)<\/p>\n

L\u2019engin orbitera environ huit mois autour de Ganyme\u0300de, dont il pourra s\u2019approcher jusqu\u2019a\u0300 200 km d\u2019altitude, a\u0300 l\u2019abri des radiations.<\/p>\n

De\u0301nue\u0301e de magne\u0301tosphe\u0300re, sa s\u0153ur Europe est moins hospitalie\u0300re pour un engin spatial : la sonde ame\u0301ricaine Europa Clipper, qui atteindra sa destination en me\u0302me temps que Juice, ne pourra que survoler sa cible. Les donne\u0301es re\u0301colte\u0301es par les deux missions seront ne\u0301anmoins comple\u0301mentaires, soulignent les scientifiques.<\/p>\n

S\u2019il s\u2019ave\u0300re que Ganyme\u0300de coche toutes les cases pour he\u0301berger la vie, la \u201csuite logique\u201d serait d\u2019y envoyer un atterrisseur, avance Cyril Cavel, responsable scientifique Airbus. \u201cC\u0327a fait partie du re\u0302ve\u201d, bien qu\u2019il n\u2019y ait pas de projet a\u0300 ce stade.<\/p>\n

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

Africa-Press – Comores. Sous leur banquise se meuvent de vastes oce\u0301ans d\u2019eau liquide, terrains propices a\u0300 l\u2019e\u0301mergence de la vie : l\u2019exploration des lunes glace\u0301es de Jupiter, destination de la mission Juice, ouvre un nouveau chapitre dans la que\u0302te de mondes extraterrestres habitables. Ces milieux sont si e\u0301loigne\u0301s du Soleil que les astronomes les ont […]<\/p>\n","protected":false},"author":82,"featured_media":8414,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,53,45],"class_list":["post-8415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-comores","tag-comores"],"yoast_head":"\nLa mission Juice part explorer les lunes glac\u00e9es de Jupiter en qu\u00eate de vie extraterrestre - Comores<\/title>\n<meta name=\"description\" content=\"Sous leur banquise se meuvent de vastes oce\u0301ans d\u2019eau liquide, terrains propices a\u0300 l\u2019e\u0301mergence de la vie : l\u2019explorati ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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