{"id":44661,"date":"2023-05-20T14:59:02","date_gmt":"2023-05-20T14:59:02","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/quand-les-anneaux-de-saturne-disparaitront"},"modified":"2023-05-20T18:56:41","modified_gmt":"2023-05-20T18:56:41","slug":"quand-les-anneaux-de-saturne-disparaitront","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-les-anneaux-de-saturne-disparaitront","title":{"rendered":"Quand les anneaux de Saturne dispara\u00eetront"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Nous vivons une e\u0301poque formidable ! Mais pour s\u2019en apercevoir, il faut prendre un peu de recul et se placer a\u0300 l\u2019e\u0301chelle du Syste\u0300me solaire. Alors oui, nous avons la chance car nous pouvons contempler les anneaux de Saturne dans toute leur majeste\u0301, un spectacle finalement assez bref dans l\u2019histoire du syste\u0300me solaire selon deux e\u0301tudes parues dans Sciences Advances et Icarus. Selon ces travaux, les anneaux de Saturne seraient apparus il y a 100 millions d\u2019anne\u0301es au plus to\u0302t, 400 millions au plus tard. Autrement dit, a\u0300 l\u2019e\u0301poque des dinosaures, ils n\u2019existaient peut-e\u0302tre pas encore. Et ils pourraient disparai\u0302tre d\u2019ici a\u0300 100 millions d\u2019anne\u0301es. Un demi-milliard d\u2019anne\u0301es d\u2019existence, ce n\u2019est donc pas grand-chose en comparaison des 4,5 milliards d\u2019anne\u0301es du Syste\u0300me solaire.<\/p>\n

Le blanc, c\u2019est salissant<\/b><\/p>\n

Ces e\u0301tudes se fondent notamment sur l\u2019analyse de mesures re\u0301alise\u0301es par la sonde Cassini, en orbite autour de Saturne entre 2004 et 2017, et plus exactement le cosmic dust analyser (analyseur de poussie\u0300res cosmiques). Cet instrument analysait la taille, la vitesse et la direction des poussie\u0300res en orbite autour de la plane\u0300te. C\u2019est gra\u0302ce a\u0300 lui que les chercheurs ont pu dater les anneaux. Ils sont constitue\u0301s de particules de glace a\u0300 plus de 95% en masse. C\u2019est pour cela qu\u2019ils refle\u0300tent si bien la lumie\u0300re du Soleil, et qu\u2019ils paraissent bien blanc.<\/p>\n

Mais le blanc, c\u2019est salissant. Des poussie\u0300res, forme\u0301es de grains compose\u0301s de roches, de me\u0301taux ou de mate\u0301riaux riches en carbone, assombrissent peu a\u0300 peu les anneaux en se de\u0301posant dessus. Connaissant le flux de poussie\u0300res autour de Saturne, et estimant la quantite\u0301 de\u0301pose\u0301e sur les anneaux, les chercheurs ont ainsi pu donner une fourchette pour l\u2019a\u0302ge des anneaux. Ils confortent ainsi l\u2019hypothe\u0300se d\u2019anneaux jeunes, privile\u0301gie\u0301e depuis quelques anne\u0301es de\u0301ja\u0300, sans qu\u2019il y ait consensus. Une autre hypothe\u0300se imagine en effet que les anneaux seraient aussi anciens que la plane\u0300te, mais re\u0301gulie\u0300rement recycle\u0301s, et nettoye\u0301s, lors de la dislocation des petits blocs de glace qui s\u2019agre\u0300gent dans les anneaux et finissent par se percuter. Mais l\u2019intensite\u0301 du flux de poussie\u0300res, mesure\u0301 par Cassini, laisse penser que le recyclage ne serait pas assez efficace pour nettoyer les anneaux…<\/p>\n

Les anneaux perdent plusieurs tonnes de matie\u0300re chaque seconde<\/b><\/p>\n

Les auteurs ne se sont pas borne\u0301s a\u0300 de\u0301terminer la date de naissance des anneaux. La publication dans Icarus estime que non seulement les anneaux sont jeunes, mais qu\u2019en plus ils ne vivront pas vieux. Et c\u2019est encore la faute des microme\u0301te\u0301orites qui les polluent. En heurtant les particules de glace, ils pre\u0301cipitent leur chute vers la plane\u0300te. Les anneaux perdraient ainsi plusieurs tonnes de matie\u0300re chaque seconde, selon une simulation des chercheurs, confirme\u0301e la\u0300 encore par des mesures re\u0301alise\u0301es par la sonde Cassini a\u0300 l\u2019e\u0301poque.<\/p>\n

Les anneaux pourraient ainsi disparai\u0302tre en une centaine de millions d\u2019anne\u0301es. Sur le site de l\u2019universite\u0301 de l\u2019Indiana (E\u0301tats-Unis). Paul Estrada, coauteur de l\u2019e\u0301tude d\u2019Icarus conclut : \u201cNous avons montre\u0301 que des anneaux massifs comme ceux de Saturne ne durent pas longtemps. On peut supposer que les anneaux relativement che\u0301tifs autour des autres ge\u0301antes de glace et de gaz de notre syste\u0300me solaire [Uranus et Neptune] sont des restes d\u2019anneaux qui e\u0301taient autrefois massifs comme ceux de Saturne. Peut-e\u0302tre que dans un avenir pas si lointain, astronomiquement parlant, les anneaux de saturne ressembleront davantage a\u0300 ceux clairseme\u0301s d\u2019Uranus.\u201d<\/p>\n

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

Africa-Press – Senegal. Nous vivons une e\u0301poque formidable ! Mais pour s\u2019en apercevoir, il faut prendre un peu de recul et se placer a\u0300 l\u2019e\u0301chelle du Syste\u0300me solaire. Alors oui, nous avons la chance car nous pouvons contempler les anneaux de Saturne dans toute leur majeste\u0301, un spectacle finalement assez bref dans l\u2019histoire du syste\u0300me […]<\/p>\n","protected":false},"author":82,"featured_media":44660,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[43,47,44],"class_list":["post-44661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press-2","tag-africa-press-senegal","tag-senegal-2"],"yoast_head":"\nQuand les anneaux de Saturne dispara\u00eetront - Senegal<\/title>\n<meta name=\"description\" content=\"Nous vivons une e\u0301poque formidable ! 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