{"id":26150,"date":"2026-04-11T11:55:00","date_gmt":"2026-04-11T09:55:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=26150"},"modified":"2026-04-11T12:21:41","modified_gmt":"2026-04-11T10:21:41","slug":"entretien-harrison-agrusa-la-mission-mmx-est-la-premiere-dediee-a-observer-les-lunes-de-mars","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/04\/11\/entretien-harrison-agrusa-la-mission-mmx-est-la-premiere-dediee-a-observer-les-lunes-de-mars\/","title":{"rendered":"[Entretien] Harrison Agrusa : \u00ab La mission MMX est la premi\u00e8re d\u00e9di\u00e9e \u00e0 observer les lunes de Mars \u00bb"},"content":{"rendered":"
\n

La Marseillaise<\/b>\u00a0<\/b>:<\/b> Vous participez \u00e0 la mission Martian Moons Exploration (MMX) qui devrait partir cette ann\u00e9e. Quel est l\u2019objectif<\/b>\u00a0<\/b>?<\/b><\/p>\n

Harrison Agrusa<\/b>\u00a0<\/b>: <\/b>Le but principal est d\u2019\u00e9tudier comment se sont form\u00e9es les deux lunes de Mars\u00a0<\/a>: Phobos et D\u00e9imos<\/a>. Elles restent tr\u00e8s peu explor\u00e9es. Certaines missions martiennes sont pass\u00e9es \u00e0 proximit\u00e9 et ont offert de belles images. Mais c\u2019est tout ce que nous avons. Aucune mission n\u2019a jamais \u00e9t\u00e9 lanc\u00e9e sp\u00e9cialement pour les \u00e9tudier. MMX est la premi\u00e8re.<\/p>\n

Comment se seraient-elles form\u00e9es ?<\/b><\/p>\n

H.A.<\/b>\u00a0<\/b>:<\/b> Il pourrait s\u2019agir d\u2019ast\u00e9ro\u00efdes \u00ab\u00a0captur\u00e9s\u00a0\u00bb par Mars\u00a0: alors qu\u2019ils passaient \u00e0 proximit\u00e9, la plan\u00e8te les aurait attir\u00e9s suffisamment pour les faire entrer en orbite autour d\u2019elle. Je n\u2019y crois pas. Il est peu probable que deux ast\u00e9ro\u00efdes captur\u00e9s au hasard aient des orbites circulaires et dans le m\u00eame plan comme Phobos et D\u00e9imos. Il est plus probable qu\u2019elles se soient form\u00e9es \u00e0 partir d\u2019un disque de d\u00e9bris rocheux issus d\u2019un impact avec Mars.<\/p>\n

La dislocation de Phobos simul\u00e9e dans votre \u00e9tude pourrait g\u00e9n\u00e9rer un nouveau disque de d\u00e9bris
\u00e0 partir duquel elle pourrait se reformer… <\/b><\/p>\n

H.A.<\/b>\u00a0<\/b>:<\/b> Tout \u00e0 fait. Il pourrait s\u2019agir d\u2019un ph\u00e9nom\u00e8ne cyclique. Phobos serait alors une \u00e9ni\u00e8me g\u00e9n\u00e9ration de lune. Mais chaque g\u00e9n\u00e9ration serait plus petite que la pr\u00e9c\u00e9dente en raison d\u2019une perte de mati\u00e8re \u00e0 chaque fois. Il arriverait un moment o\u00f9 la lune serait si petite que les forces de mar\u00e9e exerc\u00e9es par Mars deviendraient trop faibles, la r\u00e9duction de l\u2019orbite trop lente et les dislocations successives s\u2019arr\u00eateraient.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"La Marseillaise : Vous participez à la mission Martian Moons Exploration (MMX) qui devrait partir cette année. Quel est l’objectif ?Harrison Agrusa : Le but principal est d’étudier comment se sont …","protected":false},"author":1,"featured_media":26151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[3444,151,2591,2231,1832,222,1058,353,988,2001],"news-destination":[],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-26150","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe","tag-astrophysique","tag-espace","tag-la-marseillaise-week-end","tag-mars","tag-nice","tag-region-sud-paca","tag-science","tag-sciences","tag-week-end","tag-weekend","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/26150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=26150"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/26150\/revisions"}],"predecessor-version":[{"id":26152,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/26150\/revisions\/26152"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/26151"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=26150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=26150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=26150"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=26150"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=26150"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=26150"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=26150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}