{"id":14358,"date":"2016-10-12T02:50:39","date_gmt":"2016-10-12T06:50:39","guid":{"rendered":"https:\/\/cna.ca\/fr\/?post_type=news&#038;p=14358"},"modified":"2020-03-10T13:55:04","modified_gmt":"2020-03-10T17:55:04","slug":"alimenter-le-voyage-pluton","status":"publish","type":"post","link":"https:\/\/cna.ca\/fr\/2016\/10\/12\/alimenter-le-voyage-pluton\/","title":{"rendered":"Alimenter le voyage \u00e0&nbsp;Pluton"},"content":{"rendered":"<div id=\"attachment_14233\" style=\"width: 310px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-14233\" class=\"wp-image-14233 size-medium\" src=\"https:\/\/cna.ca\/wp-content\/uploads\/2016\/08\/PLUTO-credit-is-NASA-Johns-Hopkins-University-Applied-Physics-Laboratory-Southwest-Research-Institute-300x300.jpg\" alt=\"Image Credit: NASA, Johns Hopkins University Applied Physics Laboratory, Southwest Research Institute\" width=\"300\" height=\"300\" srcset=\"https:\/\/cna.ca\/wp-content\/uploads\/2016\/08\/PLUTO-credit-is-NASA-Johns-Hopkins-University-Applied-Physics-Laboratory-Southwest-Research-Institute-300x300.jpg 300w, https:\/\/cna.ca\/wp-content\/uploads\/2016\/08\/PLUTO-credit-is-NASA-Johns-Hopkins-University-Applied-Physics-Laboratory-Southwest-Research-Institute-150x150.jpg 150w, https:\/\/cna.ca\/wp-content\/uploads\/2016\/08\/PLUTO-credit-is-NASA-Johns-Hopkins-University-Applied-Physics-Laboratory-Southwest-Research-Institute-768x768.jpg 768w, https:\/\/cna.ca\/wp-content\/uploads\/2016\/08\/PLUTO-credit-is-NASA-Johns-Hopkins-University-Applied-Physics-Laboratory-Southwest-Research-Institute-1024x1024.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-14233\" class=\"wp-caption-text\">Image Credit: NASA, Johns Hopkins University Applied Physics Laboratory, Southwest Research Institute<\/p><\/div>\n<p><strong>septembre 2016<\/strong><\/p>\n<p>La technologie nucl\u00e9aire aide \u00e0 \u00e9crire l\u2019histoire sur la plan\u00e8te glaciale de notre syst\u00e8me solaire.<\/p>\n<p>Un timbre-poste portant l\u2019inscription \u00ab\u00a0Pluton pas encore explor\u00e9\u00a0\u00bb vient d\u2019\u00eatre coll\u00e9 dans nos livres d\u2019histoire apr\u00e8s avoir voyag\u00e9 plus de 3, 2 milliards de milles, plus de 5 milliards de kilom\u00e8tres, \u00e0 Pluton et plus loin encore.<\/p>\n<p>La mission a garanti \u00e0 la <a href=\"http:\/\/www.nasa.gov\/feature\/new-horizons-pluto-stamp-earns-guinness-world-record\">NASA<\/a> une place dans le <a href=\"http:\/\/www.guinnessworldrecords.com\/world-records\/431628-farthest-distance-to-send-a-postage-stamp\">livre des records Guinness<\/a>.<\/p>\n<p>Cette r\u00e9ussite est tout un exploit. Le vaisseau spatial New Horizons de la NASA a \u00e9t\u00e9 lanc\u00e9 il y a 10 ans en 2006 pour \u00e9tudier Pluton et la Ceinture de Kuiper de proche. Le froid, l\u2019obscurit\u00e9 et la distance de presque 4 milliards de milles du soleil ont fait que l\u2019\u00e9nergie solaire, les piles et des cellules de combustible n\u2019\u00e9taient pas des options viables pour la mission.<\/p>\n<p>Pour atteindre les limites glaciales du syst\u00e8me solaire, la NASA avait besoin d\u2019une source d\u2019\u00e9nergie qui pourrait survivre les conditions extr\u00eames.<\/p>\n<p>Pour Pluton, la NASA a donc eu recours au nucl\u00e9aire.<\/p>\n<p>\u00ab\u00a0Il nous fallait une source d\u2019\u00e9nergie fiable et nous avons investi beaucoup d\u2019argent et de recherche dans ces sources d\u2019\u00e9nergie, ce qui \u00e9tait la meilleure fa\u00e7on d\u2019accomplir la mission et d\u2019avoir la plus haute fiabilit\u00e9 pour notre vaisseau spatial\u00a0\u00bb, explique le Dr Ralph McNutt du John Hopkins University Applied Physics Laboratory \u00e0 Laurel, Maryland, chercheur principal pour le <a href=\"http:\/\/www.nasa.gov\/mission_pages\/newhorizons\/multimedia\/PEPSSI.html\">Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI)<\/a> de New Horizons,.<\/p>\n<p>Cela s\u2019appelle un <a href=\"https:\/\/solarsystem.nasa.gov\/rps\/newhorizons.cfm\">g\u00e9n\u00e9rateur thermo\u00e9lectrique \u00e0 radioisotope ou RTG.<\/a> Pensez-y comme une \u00ab\u00a0pile nucl\u00e9aire\u00a0\u00bb pour alimenter le vaisseau spatial. Les RTG sont aliment\u00e9s par un isotope nomm\u00e9 plutonium-238, un \u00e9l\u00e9ment artificiel avec une demi-vie de presque un si\u00e8cle. Lorsque cet isotope se d\u00e9compose, il produit de la chaleur qui est convertie en \u00e9lectricit\u00e9. L\u2019\u00e9lectricit\u00e9 n\u00e9cessaire pour alimenter la mission Pluton est d\u2019environ 200 watts, le montant \u00e9quivalent \u00e0 deux ampoules de 100 watts.<\/p>\n<p>En exploration spatiale, quelques secondes peuvent faire toute la diff\u00e9rence.<\/p>\n<p>\u00ab\u00a0Le trajet autour du soleil prend 250 ans pour Pluton, et il faut savoir exactement o\u00f9 se trouve Pluton\u00a0\u00bb, explique McNutt. \u00ab\u00a0Nous avons fait une erreur de calcul de 85 secondes au rapprochement le plus critique (en juillet 2015), de qui \u00e9tait vraiment pas mal, mais il faut r\u00e9aliser que nous voyageons \u00e0 14 kilom\u00e8tres par seconde. Multiplie cela par 100 secondes et c\u2019est presque 1 400 kilom\u00e8tres, un peu plus que le radius de Pluton\u00a0\u00bb.<\/p>\n<p>Pour ne pas manquer la chance de prendre une photo de la plan\u00e8te naine, l\u2019\u00e9quipe de scientifiques a donn\u00e9 instruction \u00e0 l\u2019appareil photo de prendre des photos d\u2019une portion d\u2019espace plus large, pour ne pas manquer Pluton et ses lunes alors que le vaisseau spatial passait.<\/p>\n<p>Depuis la d\u00e9couverte de la miniplan\u00e8te il y a presque <a href=\"http:\/\/jemesouviens.biz\/18-fevrier-1930-decouverte-de-pluton\/\">100 ans, <\/a>en 1930, on savait peu de Pluton. En 2015, des images envoy\u00e9es par New Horizons ont soulev\u00e9 de nouvelles questions concernant notre syst\u00e8me solaire. Les images envoy\u00e9es ont r\u00e9v\u00e9l\u00e9 de l\u2019activit\u00e9 ressemblant \u00e0 des glaciers, parmi bien d\u2019autres choses, ce qui a fourni de nouvelles informations sur l\u2019histoire de notre syst\u00e8me solaire.<\/p>\n<p>Le record du monde Guinness, attribu\u00e9 pour le voyage le plus long d\u2019un timbre-poste, fix\u00e9 sur le vaisseau spatial par les ing\u00e9nieurs avant le d\u00e9collage, a \u00e9t\u00e9 battu au m\u00eame moment o\u00f9 la NASA c\u00e9l\u00e9brait 40 ans de robots sur <a href=\"http:\/\/mars.nasa.gov\/msl\/mission\/technology\/technologiesofbroadbenefit\/power\/\">Mars<\/a>. Bient\u00f4t, la NASA va lancer Mars2020 comme premi\u00e8re \u00e9tape dans l\u2019espoir de ramener des \u00e9chantillons de terre de la plan\u00e8te rouge, \u00ab r\u00e9ussite spatiale \u00bb potentielle rendue possible gr\u00e2ce \u00e0 l\u2019\u00e9nergie nucl\u00e9aire.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>septembre 2016 La technologie nucl\u00e9aire aide \u00e0 \u00e9crire l\u2019histoire sur la plan\u00e8te glaciale de notre syst\u00e8me solaire. Un timbre-poste portant l\u2019inscription \u00ab\u00a0Pluton pas encore explor\u00e9\u00a0\u00bb vient d\u2019\u00eatre coll\u00e9 dans nos livres d\u2019histoire apr\u00e8s avoir voyag\u00e9 plus de 3, 2 milliards de milles, plus de 5 milliards de kilom\u00e8tres, \u00e0 Pluton et plus loin encore. La [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":14927,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[244],"tags":[],"topic":[],"class_list":["post-14358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contenu-vedette"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alimenter le voyage \u00e0 Pluton - Association nucl\u00e9aire canadienne<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cna.ca\/fr\/2016\/10\/12\/alimenter-le-voyage-pluton\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alimenter le voyage \u00e0 Pluton - Association nucl\u00e9aire canadienne\" \/>\n<meta property=\"og:description\" content=\"septembre 2016 La technologie nucl\u00e9aire aide \u00e0 \u00e9crire l\u2019histoire sur la plan\u00e8te glaciale de notre syst\u00e8me solaire. Un timbre-poste portant l\u2019inscription \u00ab\u00a0Pluton pas encore explor\u00e9\u00a0\u00bb vient d\u2019\u00eatre coll\u00e9 dans nos livres d\u2019histoire apr\u00e8s avoir voyag\u00e9 plus de 3, 2 milliards de milles, plus de 5 milliards de kilom\u00e8tres, \u00e0 Pluton et plus loin encore. 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Un timbre-poste portant l\u2019inscription \u00ab\u00a0Pluton pas encore explor\u00e9\u00a0\u00bb vient d\u2019\u00eatre coll\u00e9 dans nos livres d\u2019histoire apr\u00e8s avoir voyag\u00e9 plus de 3, 2 milliards de milles, plus de 5 milliards de kilom\u00e8tres, \u00e0 Pluton et plus loin encore. 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