{"id":20434,"date":"2026-09-06T11:14:00","date_gmt":"2026-09-06T07:14:00","guid":{"rendered":"https:\/\/eternos974.live\/?p=20434"},"modified":"2026-09-05T21:52:56","modified_gmt":"2026-09-05T17:52:56","slug":"decouverte-historique-la-plus-grande-carte-des-champs-magnetiques-cosmiques-revelee-par-le-radiotelescope-askap","status":"publish","type":"post","link":"https:\/\/eternos974.live\/index.php\/2026\/09\/06\/decouverte-historique-la-plus-grande-carte-des-champs-magnetiques-cosmiques-revelee-par-le-radiotelescope-askap\/","title":{"rendered":"D\u00e9couverte historique : La plus grande carte des champs magn\u00e9tiques cosmiques r\u00e9v\u00e9l\u00e9e par le radiot\u00e9lescope ASKAP"},"content":{"rendered":"<p>Les champs magn\u00e9tiques, ces forces invisibles qui r\u00e9gissent l&rsquo;univers, viennent d&rsquo;\u00eatre cartographi\u00e9s avec une pr\u00e9cision sans pr\u00e9c\u00e9dent gr\u00e2ce \u00e0 un radiot\u00e9lescope australien. La carte SPICE-RACS, r\u00e9alis\u00e9e par le radiot\u00e9lescope ASKAP, est aujourd&rsquo;hui la plus d\u00e9taill\u00e9e jamais produite sur ces ph\u00e9nom\u00e8nes cosmiques. Elle r\u00e9v\u00e8le des structures de la Voie lact\u00e9e et des r\u00e9gions extr\u00eamement lointaines de l&rsquo;univers, offrant aux scientifiques un outil in\u00e9dit pour explorer les myst\u00e8res de la formation des \u00e9toiles et la structuration des galaxies.<\/p>\n<p>La cl\u00e9 de cette d\u00e9couverte r\u00e9side dans l&rsquo;utilisation de la polarisation de la lumi\u00e8re. Les astronomes ont analys\u00e9 la lumi\u00e8re provenant de galaxies lointaines, qui, en traversant les champs magn\u00e9tiques, modifie sa direction d&rsquo;oscillation. Ce ph\u00e9nom\u00e8ne, d\u00e9tectable dans le domaine des ondes radio, permet de d\u00e9duire la pr\u00e9sence et l&rsquo;orientation des champs magn\u00e9tiques. Le radiot\u00e9lescope ASKAP, dot\u00e9 de 36 antennes paraboliques, a permis de cartographier pr\u00e8s de 350 000 galaxies, une avanc\u00e9e de dix fois sup\u00e9rieure aux \u00e9tudes ant\u00e9rieures. Cette m\u00e9thode, combin\u00e9e \u00e0 la vitesse d&rsquo;observation du t\u00e9lescope, a rendu possible une r\u00e9solution in\u00e9dite des structures magn\u00e9tiques.<\/p>\n<p>Les implications scientifiques sont majeures. Les champs magn\u00e9tiques, comparables \u00e0 des \u00ab batteries g\u00e9antes \u00bb, r\u00e9gulent la formation des \u00e9toiles en stockant de l&rsquo;\u00e9nergie et en ralentissant la condensation du gaz interstellaire. Cette carte offre un aper\u00e7u de leur r\u00f4le dans l&rsquo;\u00e9volution des galaxies, y compris notre propre Voie lact\u00e9e. Elle ouvre \u00e9galement la voie \u00e0 des recherches sur l&rsquo;origine des champs magn\u00e9tiques cosmiques, un myst\u00e8re qui reste l&rsquo;un des grands d\u00e9fis de l&rsquo;astrophysique. Le projet POSSUM, qui vise \u00e0 cr\u00e9er une carte encore plus pr\u00e9cise d&rsquo;ici 2030, s&rsquo;appuiera sur ces donn\u00e9es pour approfondir cette exploration.<\/p>\n<p>Les donn\u00e9es de la carte SPICE-RACS sont d\u00e9sormais accessibles en ligne, ouvrant la porte \u00e0 la communaut\u00e9 scientifique mondiale. Cette transparence favorise la collaboration internationale et stimule des d\u00e9couvertes futures. Avec l&rsquo;arriv\u00e9e de l&rsquo;observatoire SKA, la radioastronomie va conna\u00eetre une r\u00e9volution technologique, permettant d&rsquo;explorer des r\u00e9gions de l&rsquo;univers jamais observ\u00e9es. La question est d\u00e9sormais : que r\u00e9v\u00e9lera cette nouvelle g\u00e9n\u00e9ration de t\u00e9lescopes sur l&rsquo;histoire des champs magn\u00e9tiques depuis le Big Bang ?<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.numerama.com\/sciences\/2323279-cest-la-plus-grande-carte-des-champs-magnetiques-cosmiques-jamais-realisee-grace-a-un-radiotelescope-australien.html\" target=\"_blank\" rel=\"nofollow noopener\">Source 1<\/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>Une carte sans pr\u00e9c\u00e9dent des champs magn\u00e9tiques cosmiques, gr\u00e2ce au radiot\u00e9lescope ASKAP. D\u00e9couvrez ses implications pour l&rsquo;astronomie.<\/p>\n","protected":false},"author":1,"featured_media":20435,"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_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[393],"tags":[],"class_list":["post-20434","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infos"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Une carte sans pr\u00e9c\u00e9dent des champs magn\u00e9tiques cosmiques, gr\u00e2ce au radiot\u00e9lescope ASKAP. 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