{"id":6377,"date":"2021-06-30T13:11:31","date_gmt":"2021-06-30T13:11:31","guid":{"rendered":"https:\/\/www.africa-press.net\/cameroun\/politique\/panne-du-telescope-hubble-une-reparation-de-plus-en-plus-incertaine"},"modified":"2021-06-30T16:09:18","modified_gmt":"2021-06-30T16:09:18","slug":"panne-du-telescope-hubble-une-reparation-de-plus-en-plus-incertaine","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/panne-du-telescope-hubble-une-reparation-de-plus-en-plus-incertaine","title":{"rendered":"Panne du t\u00e9lescope Hubble : une r\u00e9paration de plus en plus incertaine"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong><a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a> &#8211; <a href=\"https:\/\/www.africa-press.net\/cameroun\">Cameroun<\/a>. <\/strong><\/span><b>Cela fait maintenant deux semaines que le t\u00e9lescope spatial Hubble est en panne. La NASA travaille d\u2019arrache-pied pour tenter de comprendre ce qui a provoqu\u00e9 l\u2019incident, survenu le 13 juin dernier. Apr\u00e8s plusieurs tentatives vaines de changement de module de m\u00e9moire, l\u2019Agence am\u00e9ricaine comptait utiliser l\u2019ordinateur de charge utile de secours. Probl\u00e8me : il s\u2019av\u00e8re que ce dernier pr\u00e9sente lui aussi des d\u00e9faillances.<\/b><\/p>\n<p>L\u2019espoir de restaurer le fonctionnement de ce t\u00e9lescope embl\u00e9matique s\u2019amenuise de jour en jour. La NASA pensait au d\u00e9part que le probl\u00e8me \u00e9tait issu du module de m\u00e9moire, mais le passage \u00e0 l\u2019un des trois modules de secours n\u2019a malheureusement pas permis de relancer l\u2019ordinateur de charge utile. Depuis, l\u2019\u00e9quipe responsable de l\u2019engin fondait tous ses espoirs sur l\u2019ordinateur de secours. Mais une s\u00e9rie de tests effectu\u00e9s la semaine derni\u00e8re a r\u00e9v\u00e9l\u00e9 qu\u2019il \u00e9tait lui aussi hors service.<\/p>\n<p>Ce mat\u00e9riel de secours avait \u00e9t\u00e9 install\u00e9 sur le t\u00e9lescope spatial en 2009, lors de la derni\u00e8re mission de maintenance ; il n\u2019avait jamais \u00e9t\u00e9 mis en service dans l\u2019espace jusqu\u2019alors. Mais la NASA n\u2019a pu que constater que cet ordinateur pr\u00e9sentait les m\u00eames erreurs que l\u2019ordinateur principal : les commandes d\u2019\u00e9criture ou de lecture de la m\u00e9moire ont \u00e9chou\u00e9. Le probl\u00e8me se situe vraisemblablement ailleurs, ce qui peut rendre plus difficile sa r\u00e9solution.<\/p>\n<p><b>L\u2019ordinateur de bord mis hors de cause<\/b><\/p>\n<p>Le vaisseau spatial embarque deux ordinateurs de charge utile (dont un ordinateur de sauvegarde), situ\u00e9s sur l\u2019unit\u00e9 Science Instrument and Command and Data Handling (SI C&amp;DH). Ces ordinateurs comportent un module de traitement central (CPM) \u2014 qui traite les commandes et contr\u00f4le les diff\u00e9rents instruments scientifiques \u2014 une interface standard, un bus de communication et un module de m\u00e9moire (sachant que trois modules m\u00e9moire de sauvegarde sont \u00e9galement disponibles). Or, les tests men\u00e9s par la NASA la semaine derni\u00e8re ont r\u00e9v\u00e9l\u00e9 que ces composants, que ce soit ceux de l\u2019ordinateur principal (qui date tout de m\u00eame des ann\u00e9es 1980) ou ceux de l\u2019ordinateur de sauvegarde, renvoyaient tous la m\u00eame erreur.<\/p>\n<p>\u00ab Puisqu\u2019il est hautement improbable que tous les \u00e9l\u00e9ments mat\u00e9riels individuels aient un probl\u00e8me, l\u2019\u00e9quipe consid\u00e8re maintenant un autre mat\u00e9riel comme coupable possible, y compris l\u2019unit\u00e9 de commande\/formatage de donn\u00e9es scientifiques \u00bb, a pr\u00e9cis\u00e9 la NASA vendredi, dans un communiqu\u00e9. Cette unit\u00e9 constitue un autre module du SI C&amp;DH : l\u2019unit\u00e9 de commande envoie des instructions et des donn\u00e9es aux instruments du t\u00e9lescope et l\u2019unit\u00e9 de formatage se charge de transformer les donn\u00e9es fournies par les instruments avant de les transmettre \u00e0 la Terre.<\/p>\n<p>Le probl\u00e8me pourrait \u00e9galement provenir du r\u00e9gulateur de puissance, dont le r\u00f4le est d\u2019assurer une tension constante et r\u00e9guli\u00e8re : il est possible que les tensions fournies au mat\u00e9riel soient hors limites, ce qui pourrait expliquer les d\u00e9faillances g\u00e9n\u00e9ralis\u00e9es observ\u00e9es. Cette semaine, l\u2019\u00e9quipe va donc explorer ces deux sources possibles de dysfonctionnement. L\u00e0 encore, en cas de besoin, les deux \u00e9quipements existent en version de sauvegarde.<\/p>\n<p><b>Une perte inestimable pour la communaut\u00e9 scientifique<\/b><\/p>\n<p>Ce sera peut-\u00eatre les derni\u00e8res tentatives de la NASA pour relancer le t\u00e9lescope spatial, qui demeure \u00e0 ce jour le plus puissant du monde. Apr\u00e8s plus de trente ann\u00e9es de bons et loyaux services, Hubble va donc peut-\u00eatre bient\u00f4t tirer sa r\u00e9v\u00e9rence. Les premi\u00e8res galaxies qui se sont form\u00e9es apr\u00e8s le Big Bang, de nouvelles lunes autour de Pluton, ou encore le taux d\u2019expansion de l\u2019Univers, voil\u00e0 tout autant de d\u00e9couvertes cl\u00e9s r\u00e9alis\u00e9es gr\u00e2ce \u00e0 ce t\u00e9lescope. Apr\u00e8s tant de succ\u00e8s, la NASA esp\u00e8re qu\u2019il pourra continuer \u00e0 fonctionner jusqu\u2019\u00e0 la fin des ann\u00e9es 2020.<\/p>\n<p>\u00ab Hubble est l\u2019une des missions astrophysiques les plus importantes de la NASA. Il fonctionne depuis plus de 31 ans, et la NASA esp\u00e8re qu\u2019il durera encore de nombreuses ann\u00e9es \u00bb, a d\u00e9clar\u00e9 un porte-parole de l\u2019agence \u00e0 Business Insider. \u00ab Du point de vue de la valeur de Hubble pour la communaut\u00e9 scientifique, il s\u2019agit toujours du t\u00e9lescope le plus puissant disponible, donc l\u2019\u00e2ge n\u2019est pas un facteur de d\u00e9cision \u00bb, souligne-t-il.<\/p>\n<p>Il est certain que si Hubble cessait d\u00e9finitivement de fonctionner, ce serait une perte majeure pour toute la communaut\u00e9 des astronomes et astrophysiciens. La NASA prendra alors la d\u00e9cision de le d\u00e9sint\u00e9grer, en le guidant vers notre atmosph\u00e8re \u00e0 travers laquelle il se consumera rapidement<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Cameroun. Cela fait maintenant deux semaines que le t\u00e9lescope spatial Hubble est en panne. La NASA travaille d\u2019arrache-pied pour tenter de comprendre ce qui a provoqu\u00e9 l\u2019incident, survenu le 13 juin dernier. Apr\u00e8s plusieurs tentatives vaines de changement de module de m\u00e9moire, l\u2019Agence am\u00e9ricaine comptait utiliser l\u2019ordinateur de charge utile de secours. Probl\u00e8me [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":6375,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[36,50,49,73,74,75],"class_list":["post-6377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cameroun","tag-cameroun","tag-hubble","tag-nasa","tag-telescope-hubble"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Panne du t\u00e9lescope Hubble : une r\u00e9paration de plus en plus incertaine - Cameroun<\/title>\n<meta name=\"description\" content=\"Cela fait maintenant deux semaines que le t\u00e9lescope spatial Hubble est en panne. 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