{"id":22178,"date":"2026-11-07T08:33:00","date_gmt":"2026-11-07T04:33:00","guid":{"rendered":"https:\/\/eternos974.live\/?p=22178"},"modified":"2026-11-06T21:50:22","modified_gmt":"2026-11-06T17:50:22","slug":"escapade-repasser-pres-de-la-terre-pour-rejoindre-mars","status":"publish","type":"post","link":"https:\/\/eternos974.live\/index.php\/2026\/11\/07\/escapade-repasser-pres-de-la-terre-pour-rejoindre-mars\/","title":{"rendered":"ESCAPADE : repasser pr\u00e8s de la Terre pour rejoindre Mars"},"content":{"rendered":"<p>La NASA a programm\u00e9 les passages des deux sondes ESCAPADE pr\u00e8s de la Terre les 7 et 9 novembre 2026. Chaque engin doit profiter de la gravit\u00e9 de notre plan\u00e8te et allumer son moteur au voisinage du passage pour se diriger vers Mars. Au moment de la pr\u00e9paration de cet article, les man\u0153uvres sont encore annonc\u00e9es : leur r\u00e9ussite n\u2019est pas confirm\u00e9e.<\/p>\n<p>Leur itin\u00e9raire explique pourquoi une mission lanc\u00e9e depuis longtemps peut encore revenir pr\u00e8s de la Terre. Avant de prendre cette route vers Mars, les sondes ont suivi une trajectoire d\u2019attente dans l\u2019environnement terrestre. Cette organisation a permis d\u2019adapter le voyage aux contraintes du lancement et du rendez-vous avec la plan\u00e8te rouge.<\/p>\n<p><h2>La gravit\u00e9 et le moteur travaillent ensemble<\/h2>\n<p>Une assistance gravitationnelle modifie la direction et la vitesse d\u2019une sonde par rapport au Soleil. Dans le cas d\u2019ESCAPADE, le passage pr\u00e8s de la Terre s\u2019accompagne d\u2019un allumage moteur pour apporter l\u2019impulsion suppl\u00e9mentaire n\u00e9cessaire \u00e0 la nouvelle trajectoire. Les deux op\u00e9rations font partie d\u2019un m\u00eame plan de navigation, avec un horaire et une g\u00e9om\u00e9trie pr\u00e9cis.<\/p>\n<p>L\u2019image d\u2019un trajet direct peut \u00eatre trompeuse : la Terre et Mars se d\u00e9placent, les sondes aussi, et l\u2019objectif est de rejoindre la destination l\u00e0 o\u00f9 elle se trouvera \u00e0 l\u2019arriv\u00e9e. Le trajet prend donc la forme d\u2019une courbe calcul\u00e9e, ajustable par des corrections. Comparer la vitesse \u00e0 celle d\u2019un avion peut donner un ordre d\u2019id\u00e9e, mais un nombre de Mach, d\u00e9pendant de la propagation du son dans un milieu, est mal adapt\u00e9 \u00e0 ce voyage spatial.<\/p>\n<p><h2>Deux points de vue sur l\u2019environnement martien<\/h2>\n<p>La mission doit \u00e9tudier l\u2019interaction du vent solaire avec l\u2019environnement magn\u00e9tique et le plasma de Mars. Le plasma est un gaz dont une partie des particules est \u00e9lectriquement charg\u00e9e. Les mesures coordonn\u00e9es de deux engins peuvent aider \u00e0 distinguer un changement qui se produit avec le temps d\u2019une diff\u00e9rence entre deux r\u00e9gions observ\u00e9es.<\/p>\n<p>La trajectoire d\u2019attente a d\u00e9j\u00e0 fourni l\u2019occasion de recueillir des observations dans une r\u00e9gion lointaine de la magn\u00e9toqueue terrestre. La NASA pr\u00e9voit d\u2019en pr\u00e9senter les r\u00e9sultats. La prochaine \u00e9tape op\u00e9rationnelle reste toutefois le passage pr\u00e8s de la Terre : il faut s\u00e9parer le plan de vol, le compte rendu de son ex\u00e9cution et les r\u00e9sultats scientifiques qui suivront. Le raccourci vers Mars commence ici par un retour au voisinage du point de d\u00e9part.<\/p>\n<p>Sources : <a href=\"https:\/\/science.nasa.gov\/blogs\/escapade\/2026\/11\/02\/nasas-twin-escapade-spacecraft-to-slingshot-past-earth-on-way-to-mars\/\">NASA<\/a>.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.numerama.com\/sciences\/2369433-assez-rapides-pour-faire-paris-new-york-en-10-minutes-les-sondes-escapade-foncent-enfin-vers-mars.html\" target=\"_blank\" rel=\"nofollow noopener\">Source 1<\/a><\/li>\n<li><a href=\"https:\/\/science.nasa.gov\/blogs\/escapade\/2026\/11\/02\/nasas-twin-escapade-spacecraft-to-slingshot-past-earth-on-way-to-mars\/\" target=\"_blank\" rel=\"nofollow noopener\">Source 2<\/a><\/li>\n<\/ul>\n<p>\u00c0 tr\u00e8s vite sur <a href=\"https:\/\/eternos974.live\" target=\"_blank\" rel=\"noopener\"><strong>l\u2019EternoStation<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les sondes ESCAPADE pr\u00e9parent leur passage pr\u00e8s de la Terre pour partir vers Mars. Gravit\u00e9 et allumage moteur se combinent dans une trajectoire inhabituelle.<\/p>\n","protected":false},"author":1,"featured_media":22179,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"cybocfi_hide_featured_image":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[393],"tags":[],"class_list":["post-22178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infos"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"Les sondes ESCAPADE pr\u00e9parent leur passage pr\u00e8s de la Terre pour partir vers Mars. 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