{"id":3256,"date":"2026-09-21T00:09:18","date_gmt":"2026-09-20T23:09:18","guid":{"rendered":"https:\/\/www.laurensoff.com\/wordpress\/?p=3256"},"modified":"2026-09-21T09:42:14","modified_gmt":"2026-09-21T08:42:14","slug":"voyager-1-et-voyager-2-sont-deux-sondes-spatiales-jumelles-lancees-par-la-nasa-en-1977","status":"publish","type":"post","link":"https:\/\/www.laurensoff.com\/wordpress\/voyager-1-et-voyager-2-sont-deux-sondes-spatiales-jumelles-lancees-par-la-nasa-en-1977\/","title":{"rendered":"Voyager 1 et Voyager 2 sont deux sondes spatiales jumelles lanc\u00e9es par la NASA en 1977."},"content":{"rendered":"<p data-path-to-node=\"0\"><b data-path-to-node=\"0\" data-index-in-node=\"0\"><span class=\"x1xsqp64 xiy17q3 x1o6pynw x19co3pv xdj266r xjn30re xat24cr x1hb08if x2b8uid\" data-testid=\"emoji\" data-emoji-size=\"16\"><span class=\"xexx8yu xcaqkgz x18d9i69 xbwkkl7 x3jgonx x1bhl96m\">\ud83c\udf82<\/span><\/span><span class=\"citation-23\">Le <\/span><span class=\"citation-23\">50\u1d49 anniversaire<\/span><span class=\"citation-23\"> des missions Voyager aura lieu \u00e0 la fin de l&#8217;\u00e9t\u00e9 <\/span><span class=\"citation-23\">2027<\/span><span class=\"citation-23 citation-end-23\"> (Voyager 2 ayant \u00e9t\u00e9 lanc\u00e9e le 20 ao\u00fbt et Voyager 1 le 5 septembre 1977).<span class=\"x1xsqp64 xiy17q3 x1o6pynw x19co3pv xdj266r xjn30re xat24cr x1hb08if x2b8uid\" data-testid=\"emoji\" data-emoji-size=\"16\"><span class=\"xexx8yu xcaqkgz x18d9i69 xbwkkl7 x3jgonx x1bhl96m\">\ud83c\udf82<\/span><\/span><\/span>Voyager 1<\/b> et <b data-path-to-node=\"0\" data-index-in-node=\"13\">Voyager 2<\/b> sont deux sondes spatiales jumelles lanc\u00e9es par la NASA en 1977. Con\u00e7ues \u00e0 l&#8217;origine pour \u00e9tudier le syst\u00e8me solaire externe, elles sont devenues les objets fabriqu\u00e9s par l&#8217;homme les plus \u00e9loign\u00e9s de la Terre et continuent d&#8217;\u00e9mettre aujourd&#8217;hui.<\/p>\n<h3 data-path-to-node=\"1\">La mission d&#8217;origine : l&#8217;alignement des plan\u00e8tes<\/h3>\n<p data-path-to-node=\"2\">\u00c0 la fin des ann\u00e9es 1970, un alignement rare de Jupiter, Saturne, Uranus et Neptune a permis d&#8217;utiliser l&#8217;assistance gravitationnelle : chaque plan\u00e8te propulsait la sonde vers la suivante, r\u00e9duisant le temps de trajet de plusieurs d\u00e9cennies.<\/p>\n<ul data-path-to-node=\"3\">\n<li>\n<p data-path-to-node=\"3,0,0\"><b data-path-to-node=\"3,0,0\" data-index-in-node=\"0\">Voyager 2<\/b> a \u00e9t\u00e9 lanc\u00e9e en premier (20 ao\u00fbt 1977) sur une trajectoire plus lente mais permettant d&#8217;installer le &#8220;Grand Tour&#8221;. Elle reste \u00e0 ce jour la seule sonde \u00e0 avoir survol\u00e9 <b data-path-to-node=\"3,0,0\" data-index-in-node=\"177\">Uranus<\/b> (1986) et <b data-path-to-node=\"3,0,0\" data-index-in-node=\"194\">Neptune<\/b> (1989).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"3,1,0\"><b data-path-to-node=\"3,1,0\" data-index-in-node=\"0\">Voyager 1<\/b> a \u00e9t\u00e9 lanc\u00e9e peu apr\u00e8s (5 septembre 1977) sur une trajectoire plus rapide. Apr\u00e8s avoir survoll\u00e9 Jupiter et Saturne, la NASA a choisi de lui faire raser <b data-path-to-node=\"3,1,0\" data-index-in-node=\"162\">Titan<\/b>, la plus grande lune de Saturne, ce qui l&#8217;a d\u00e9vi\u00e9e du plan plan\u00e9taire vers le &#8220;haut&#8221; du syst\u00e8me solaire.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"4\">L&#8217;entr\u00e9e dans l&#8217;espace interstellaire<\/h3>\n<p data-path-to-node=\"5\">Apr\u00e8s leurs survols plan\u00e9taires, les deux sondes ont poursuivi leur route vers les confins du syst\u00e8me solaire.<\/p>\n<ul data-path-to-node=\"6\">\n<li>\n<p data-path-to-node=\"6,0,0\"><b data-path-to-node=\"6,0,0\" data-index-in-node=\"0\">Voyager 1<\/b> a franchi l&#8217;h\u00e9liopause (la fronti\u00e8re o\u00f9 le vent solaire c\u00e8de la place au milieu interstellaire) en <b data-path-to-node=\"6,0,0\" data-index-in-node=\"109\">ao\u00fbt 2012<\/b>, devenant le premier objet humain \u00e0 entrer dans l&#8217;espace interstellaire.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"6,1,0\"><b data-path-to-node=\"6,1,0\" data-index-in-node=\"0\">Voyager 2<\/b> la rejoint dans l&#8217;espace interstellaire en <b data-path-to-node=\"6,1,0\" data-index-in-node=\"53\">novembre 2018<\/b>.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"7\">Le message \u00e0 bord : Le <i data-path-to-node=\"7\" data-index-in-node=\"23\">Golden Record<\/i><\/h3>\n<p data-path-to-node=\"8\">Chaque sonde emporte un disque en cuivre dor\u00e9 (<i data-path-to-node=\"8\" data-index-in-node=\"47\">Golden Record<\/i>) contenant des sons de la Terre (bruits de la nature, musiques, salutations en 55 langues) et des images cod\u00e9es, destin\u00e9 \u00e0 une \u00e9ventuelle intelligence extraterrestre qui croiserait leur route.<\/p>\n<h3 data-path-to-node=\"9\">Outils et fin de mission<\/h3>\n<p data-path-to-node=\"10\">Aliment\u00e9es par des g\u00e9n\u00e9rateurs thermo\u00e9lectriques \u00e0 radioisotope (RTG) au plutonium-238, leur puissance diminue d&#8217;ann\u00e9e en ann\u00e9e. La NASA \u00e9teint progressivement les instruments scientifiques non essentiels pour \u00e9conomiser l&#8217;\u00e9nergie et maintenir le contact radio le plus longtemps possible.<\/p>\n<p data-path-to-node=\"0\">Chaque sonde emporte le <b data-path-to-node=\"0\" data-index-in-node=\"24\">Voyager Golden Record<\/b>, un disque phonographique en cuivre plaqu\u00e9 or de 30 cm, con\u00e7u comme une &#8220;bouteille \u00e0 la mer&#8221; intergalactique destin\u00e9e \u00e0 une \u00e9ventuelle vie intelligente extraterrestre.<\/p>\n<div class=\"attachment-container search-images\">\n<figure id=\"attachment_3258\" aria-describedby=\"caption-attachment-3258\" style=\"width: 557px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-3258\" src=\"https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7.jpg\" alt=\"\" width=\"557\" height=\"557\" srcset=\"https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7.jpg 2048w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-300x300.jpg 300w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-1024x1024.jpg 1024w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-150x150.jpg 150w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-768x768.jpg 768w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-1536x1536.jpg 1536w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-600x600.jpg 600w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-100x100.jpg 100w, https:\/\/www.laurensoff.com\/wordpress\/wp-content\/uploads\/2026\/09\/licensed-image-7-560x560.jpg 560w\" sizes=\"auto, (max-width: 557px) 100vw, 557px\" \/><figcaption id=\"caption-attachment-3258\" class=\"wp-caption-text\">Vector illustration of the voyager golden record with explanation on white background. Space and solar system topic.<\/figcaption><\/figure>\n<\/div>\n<h3 data-path-to-node=\"3\">Ce que contient le disque<\/h3>\n<p data-path-to-node=\"4\">Supervis\u00e9 par l&#8217;astronome <b data-path-to-node=\"4\" data-index-in-node=\"26\">Carl Sagan<\/b>, le contenu r\u00e9sume la diversit\u00e9 de la vie et de la culture sur Terre :<\/p>\n<ul data-path-to-node=\"5\">\n<li>\n<p data-path-to-node=\"5,0,0\"><b data-path-to-node=\"5,0,0\" data-index-in-node=\"0\">115 images et sch\u00e9mas analogiques :<\/b> Des photos d&#8217;\u00eatres humains, d&#8217;animaux, de paysages, de structures d&#8217;ADN, de calculs math\u00e9matiques et d&#8217;infrastructures terrestres.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,1,0\"><b data-path-to-node=\"5,1,0\" data-index-in-node=\"0\">Sons de la Terre :<\/b> Des bruits naturels (vent, pluie, tonnerre, chant des oiseaux, baleines) et humains (pas, rires, battements de c\u0153ur, d\u00e9collage de fus\u00e9e).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,2,0\"><b data-path-to-node=\"5,2,0\" data-index-in-node=\"0\">Messages parl\u00e9s :<\/b> Des salutations dans <b data-path-to-node=\"5,2,0\" data-index-in-node=\"39\">55 langues humaines<\/b> (du sum\u00e9rien au chinois moderne, en passant par le fran\u00e7ais \u00ab <i data-path-to-node=\"5,2,0\" data-index-in-node=\"121\">Bonjour tout le monde<\/i> \u00bb), ainsi qu&#8217;un message du pr\u00e9sident am\u00e9ricain Jimmy Carter.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"5,3,0\"><b data-path-to-node=\"5,3,0\" data-index-in-node=\"0\">Un floril\u00e8ge musical (90 minutes) :<\/b> Un m\u00e9lange de musiques classiques (Bach, Beethoven, Mozart), de musiques traditionnelles du monde entier (P\u00e9rou, Azerba\u00efdjan, S\u00e9n\u00e9gal&#8230;) et de rock avec Chuck Berry (<i data-path-to-node=\"5,3,0\" data-index-in-node=\"203\">Johnny B. Goode<\/i>).<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"6\">La pochette de protection et son &#8220;mode d&#8217;emploi&#8221;<\/h3>\n<p data-path-to-node=\"7\">Le disque est prot\u00e9g\u00e9 par un \u00e9tui en aluminium dor\u00e9 qui contient une aiguille de lecture et des gravures expliquant comment lire le disque :<\/p>\n<ol start=\"1\" data-path-to-node=\"8\">\n<li>\n<p data-path-to-node=\"8,0,0\"><b data-path-to-node=\"8,0,0\" data-index-in-node=\"0\">La vitesse de lecture :<\/b> D\u00e9finie \u00e0 l&#8217;aide de la p\u00e9riode de transition de l&#8217;atome d&#8217;hydrog\u00e8ne (l&#8217;\u00e9l\u00e9ment le plus abondant de l&#8217;Univers), prise comme unit\u00e9 de temps universelle.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,1,0\"><b data-path-to-node=\"8,1,0\" data-index-in-node=\"0\">La carte des pulsars :<\/b> Un sch\u00e9ma indiquant la position du Soleil par rapport \u00e0 14 pulsars connus, permettant de dater le lancement et de situer la Terre dans la galaxie.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"8,2,0\"><b data-path-to-node=\"8,2,0\" data-index-in-node=\"0\">Le d\u00e9codage des images :<\/b> Des sch\u00e9mas expliquant comment convertir le signal audio du disque pour reconstituer les images visuelles.<\/p>\n<\/li>\n<\/ol>\n<p data-path-to-node=\"9\">Le disque est recouvert d&#8217;une fine couche d&#8217;Uranium-238 pur. Gr\u00e2ce \u00e0 sa demi-vie de 4,5 milliards d&#8217;ann\u00e9es, une civilisation qui intercepterait la sonde pourra analyser la d\u00e9sint\u00e9gration de l&#8217;uranium pour d\u00e9terminer pr\u00e9cis\u00e9ment depuis combien de temps la sonde voyage.<\/p>\n<p id=\"p-rc_1b6b652d7d5dd884-22\" data-path-to-node=\"0\"><span class=\"citation-23\">Le <\/span><b data-path-to-node=\"0\" data-index-in-node=\"3\"><span class=\"citation-23\">50\u1d49 anniversaire<\/span><\/b><span class=\"citation-23\"> des missions Voyager aura lieu \u00e0 la fin de l&#8217;\u00e9t\u00e9 <\/span><b data-path-to-node=\"0\" data-index-in-node=\"69\"><span class=\"citation-23\">2027<\/span><\/b><span class=\"citation-23 citation-end-23\"> (Voyager 2 ayant \u00e9t\u00e9 lanc\u00e9e le 20 ao\u00fbt et Voyager 1 le 5 septembre 1977).<\/span><\/p>\n<p data-path-to-node=\"1\">Bien que les programmes pr\u00e9cis des festivit\u00e9s de 2027 soient en cours de finalisation par les agences spatiales, plusieurs lieux cl\u00e9s sont incontournables pour suivre ou f\u00eater cet \u00e9v\u00e9nement :<\/p>\n<h3 data-path-to-node=\"2\">1. Aux \u00c9tats-Unis (C\u0153ur historique de la mission)<\/h3>\n<ul data-path-to-node=\"3\">\n<li>\n<p data-path-to-node=\"3,0,0\"><b data-path-to-node=\"3,0,0\" data-index-in-node=\"0\">NASA Jet Propulsion Laboratory (JPL) \u2013 Pasadena, Californie :<\/b> C&#8217;est le centre de contr\u00f4le historique o\u00f9 la mission Voyager a \u00e9t\u00e9 con\u00e7ue et est toujours pilot\u00e9e. Le JPL organise traditionnellement des conf\u00e9rences d&#8217;honneur, des c\u00e9r\u00e9monies publiques et des retransmissions sp\u00e9ciales pour marquer ces jalons.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"3,1,0\"><b data-path-to-node=\"3,1,0\" data-index-in-node=\"0\">National Air and Space Museum (Smithsonian) \u2013 Washington, D.C. :<\/b> Ce mus\u00e9e conserve la maquette d&#8217;ing\u00e9nierie officielle de Voyager et la r\u00e9plique du <i data-path-to-node=\"3,1,0\" data-index-in-node=\"148\">Golden Record<\/i>. Des pr\u00e9sentations m\u00e9diatiques et documentaires (notamment avec la cha\u00eene PBS) y accompagnent ce jubil\u00e9.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"4\">2. En France et en Europe<\/h3>\n<ul data-path-to-node=\"5\">\n<li>\n<p id=\"p-rc_1b6b652d7d5dd884-23\" data-path-to-node=\"5,0,0\"><b data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"><span class=\"citation-22 citation-end-22\">La Cit\u00e9 de l&#8217;espace (Toulouse) :<\/span><\/b> <span class=\"citation-21\">Principal centre de culture scientifique spatial en Europe, la Cit\u00e9 de l&#8217;espace propose un parcours permanent (<\/span><i data-path-to-node=\"5,0,0\" data-index-in-node=\"144\"><span class=\"citation-21\">Le Quai du Syst\u00e8me solaire<\/span><\/i><span class=\"citation-21 citation-end-21\">) d\u00e9di\u00e9 aux sondes spatiales.<\/span> <span class=\"citation-20 citation-end-20\">Le site pr\u00e9pare une programmation renforc\u00e9e pour 2027 (ann\u00e9e qui marquera \u00e9galement les 30 ans de la Cit\u00e9 elle-m\u00eame) autour des grandes r\u00e9ussites de l&#8217;exploration interstellaire.<\/span><\/p>\n<\/li>\n<li>\n<p id=\"p-rc_1b6b652d7d5dd884-24\" data-path-to-node=\"5,1,0\"><b data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"><span class=\"citation-19 citation-end-19\">Le Mus\u00e9e de l&#8217;Air et de l&#8217;Espace (Le Bourget) :<\/span><\/b> <span class=\"citation-18 citation-end-18\">Ce mus\u00e9e organise r\u00e9guli\u00e8rement des \u00e9v\u00e9nements th\u00e9matiques (tables rondes, conf\u00e9rences et ateliers d&#8217;astronomie) lors des grands anniversaires spatiaux.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"6\">3. Comment participer \u00e0 distance ?<\/h3>\n<ul data-path-to-node=\"7\">\n<li>\n<p data-path-to-node=\"7,0,0\"><b data-path-to-node=\"7,0,0\" data-index-in-node=\"0\">NASA Live &amp; R\u00e9seaux sociaux :<\/b> La NASA diffusera des conf\u00e9rences en direct depuis le JPL r\u00e9unissant les derniers ing\u00e9nieurs et scientifiques encore actifs de l&#8217;\u00e9quipe d&#8217;origine.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"7,1,0\"><b data-path-to-node=\"7,1,0\" data-index-in-node=\"0\">Observatoires et clubs d&#8217;astronomie locaux :<\/b> En France, les associations r\u00e9gionales d&#8217;astronomie et les plan\u00e9tariums proposent g\u00e9n\u00e9ralement des soir\u00e9es th\u00e9matiques et des conf\u00e9rences autour du <i data-path-to-node=\"7,1,0\" data-index-in-node=\"193\">Golden Record<\/i> et de l&#8217;espace interstellaire \u00e0 ces dates cl\u00e9s.<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udf82Le 50\u1d49 anniversaire des missions Voyager aura lieu \u00e0 la fin de l&#8217;\u00e9t\u00e9 2027 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