{"id":5659,"date":"2022-02-02T08:32:47","date_gmt":"2022-02-02T07:32:47","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=5659"},"modified":"2022-02-02T08:32:48","modified_gmt":"2022-02-02T07:32:48","slug":"mars-en-direct-aux-imbergeres","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/02\/02\/mars-en-direct-aux-imbergeres\/","title":{"rendered":"Mars en direct aux Imberg\u00e8res"},"content":{"rendered":"\n<p><em>Peut-on vraiment rester seul sur Mars&nbsp;?<\/em> C\u2019\u00e9tait le titre d\u2019une conf\u00e9rence annonc\u00e9e par Sceaux Mag pour le mardi 25 janvier. Propos\u00e9e par le Coll\u00e8ge universitaire Jean-Fournier, elle \u00e9tait anim\u00e9e par Roland Lehoucq, chercheur en astronomie au CEA de Saclay. De quoi donner envie d\u2019aller voir aux Garages le jour venu.<\/p>\n\n\n\n<p>J\u2019ai d\u2019abord d\u00e9couvert qu\u2019un film intitul\u00e9 \u00ab&nbsp;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Seul_sur_Mars_(film)\" target=\"_blank\" rel=\"noreferrer noopener\">Seul sur Mars&nbsp;<\/a>\u00bb a \u00e9t\u00e9 diffus\u00e9 il y a quelques ann\u00e9es. Il \u00e9tait r\u00e9alis\u00e9 par Ridley Scott, avec <a href=\"https:\/\/www.youtube.com\/watch?v=Zbd5XgPnmuc\" target=\"_blank\" rel=\"noreferrer noopener\">Matt Damon dans le r\u00f4le du h\u00e9ros solitaire<\/a>, abandonn\u00e9 par les siens sur une plan\u00e8te sans vie. Botaniste de formation, il arrive \u00e0 faire pousser des pommes de terre selon des proc\u00e9d\u00e9s ing\u00e9nieux que seule la science-fiction peut mettre au point.<\/p>\n\n\n\n<p>Astucieusement le conf\u00e9rencier a repris des s\u00e9quences du film pour \u00ab&nbsp;raconter&nbsp;\u00bb la plan\u00e8te. En expliquant par exemple pourquoi le pr\u00e9texte du d\u00e9but du film (d\u00e9part des explorateurs en catastrophe en raison d\u2019une temp\u00eate) n\u2019\u00e9tait pas r\u00e9aliste. En effet, la pression atmosph\u00e9rique sur la plan\u00e8te rouge est tellement faible (1\/160<sup>e<\/sup> de ce qu\u2019elle est sur terre) que m\u00eame une temp\u00eate ne produit pas de forces suffisantes pour faire basculer une fus\u00e9e (on en est tr\u00e8s loin).<\/p>\n\n\n\n<p>L\u2019id\u00e9e n\u2019\u00e9tait \u00e9videmment pas de critiquer le film (qui ne se veut certainement pas un documentaire), mais de s\u2019appuyer sur ses images pour donner quelques \u00e9l\u00e9ments sur celle qu\u2019on appelle \u00ab&nbsp;la plan\u00e8te&nbsp;rouge&nbsp;\u00bb. Une plan\u00e8te o\u00f9 les couchers de soleil sont bleu fonc\u00e9 (parce que l\u2019atmosph\u00e8re est t\u00e9nue et tr\u00e8s charg\u00e9e de grains de poussi\u00e8re si j\u2019ai bien compris) tandis que notre \u00ab&nbsp;plan\u00e8te bleue&nbsp;\u00bb a des couchers de soleil rougeoyants&nbsp;!<\/p>\n\n\n\n<p>Le conf\u00e9rencier a ainsi abord\u00e9 divers sujets&nbsp;: la m\u00e9t\u00e9orologie sp\u00e9cifique de Mars, les caract\u00e9ristiques d\u2019un scaphandre adapt\u00e9, les endroits o\u00f9 l\u2019on peut trouver de l\u2019eau (en particulier dans la roche elle-m\u00eame), la teneur en potassium et en sodium de cette eau, le type de paysage et ce qu\u2019un g\u00e9ologue peut en tirer\u2026<\/p>\n\n\n\n<p>Un humain a de nombreux besoins quotidiens qui seraient tr\u00e8s compliqu\u00e9s \u00e0 satisfaire sur une plan\u00e8te o\u00f9 toute vie a disparu depuis des milliards d\u2019ann\u00e9es (si m\u00eame <a rel=\"noreferrer noopener\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Noachien#Indications_d'une_hydrosph%C3%A8re_martienne\" target=\"_blank\">elle a peut-\u00eatre exist\u00e9 <\/a>un jour)\u00a0: trouver de l\u2019oxyg\u00e8ne \u00e0 respirer quand l\u2019atmosph\u00e8re est principalement compos\u00e9e de CO2, trouver de l\u2019eau \u00e0 boire, de quoi manger. Le film imagine comment le cosmonaute trouve des solutions \u00e0 cet effet. Dans la r\u00e9alit\u00e9 cela n\u00e9cessiterait \u00e9norm\u00e9ment d\u2019\u00e9nergie\u00a0: apporter tout ce qu\u2019il faut \u00e0 partir de la terre repr\u00e9sente un co\u00fbt faramineux.<\/p>\n\n\n\n<p>Il est possible qu\u2019on envoie un jour des hommes sur Mars, mais l\u2019objectif serait surtout symbolique.<\/p>\n\n\n\n<p>Le conf\u00e9rencier ne l\u2019a pas \u00e9voqu\u00e9, mais il existe des projets pour \u00ab\u00a0terraformer\u00a0\u00bb la plan\u00e8te Mars, en y envoyant des robots plut\u00f4t que des hommes. <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Terraformation_de_Mars\" target=\"_blank\" rel=\"noreferrer noopener\">La page Wikip\u00e9dia<\/a> sur le sujet pr\u00e9cise que les m\u00e9thodes \u00e0 utiliser sont techniquement accessibles, mais que \u00ab\u00a0les ressources \u00e9conomiques n\u00e9cessaires \u00e0 leur mise en place technique sont encore hors de port\u00e9e\u00a0\u00bb. \u00a0<\/p>\n\n\n\n<p>L\u2019heure est vite pass\u00e9e pour la vingtaine d\u2019auditeurs qui ont ensuite pos\u00e9 des questions. La conf\u00e9rence m\u2019a donn\u00e9 envie d\u2019en savoir plus sur <a href=\"http:\/\/cuf.nursit.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u2019association<\/a> organisatrice qui parvient \u00e0 programmer un th\u00e8me par semaine\u00a0: cela devrait faire l\u2019objet d\u2019un prochain article.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Peut-on vraiment rester seul sur Mars&nbsp;? C\u2019\u00e9tait le titre d\u2019une conf\u00e9rence annonc\u00e9e par Sceaux Mag pour le mardi 25 janvier. Propos\u00e9e par le Coll\u00e8ge universitaire Jean-Fournier, elle \u00e9tait anim\u00e9e par Roland Lehoucq, chercheur en astronomie au CEA de Saclay. De quoi donner envie d\u2019aller voir aux Garages le jour venu.&#8230;<\/p>\n","protected":false},"author":11,"featured_media":5661,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[55,5],"tags":[],"class_list":["post-5659","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-detente","category-des-quartiers-de-sceaux","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mars en direct aux Imberg\u00e8res - La Gazette<\/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:\/\/sceaux-lagazette.fr\/index.php\/2022\/02\/02\/mars-en-direct-aux-imbergeres\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mars en direct aux Imberg\u00e8res - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Peut-on vraiment rester seul sur Mars&nbsp;? C\u2019\u00e9tait le titre d\u2019une conf\u00e9rence annonc\u00e9e par Sceaux Mag pour le mardi 25 janvier. Propos\u00e9e par le Coll\u00e8ge universitaire Jean-Fournier, elle \u00e9tait anim\u00e9e par Roland Lehoucq, chercheur en astronomie au CEA de Saclay. 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