{"id":56789,"date":"2026-05-18T08:47:55","date_gmt":"2026-05-18T06:47:55","guid":{"rendered":"https:\/\/www.leblogdescoutheillas.com\/?p=56789"},"modified":"2026-05-19T07:50:14","modified_gmt":"2026-05-19T05:50:14","slug":"lunivers-fait-des-progres","status":"publish","type":"post","link":"https:\/\/www.leblogdescoutheillas.com\/?p=56789","title":{"rendered":"L’Univers fait des progr\u00e8s"},"content":{"rendered":"


\nAttention, ne vous y trompez pas, ceci n\u2019est pas un article de vulgarisation, c\u2019est juste le recueil de quelques faits av\u00e9r\u00e9s qui vous permettront de briller en soci\u00e9t\u00e9 (mais pas bien longtemps).<\/em><\/span><\/p>\n

Il y a cinquante ans :<\/strong>
\n\u2014 on avait calcul\u00e9 que l\u2019Univers avait 13 milliards d\u2019ann\u00e9es.
\n\u2014 on estimait le nombre de galaxies \u00e0 une bonne centaine de milliards.
\n\u2014 on pensait que toute la mati\u00e8re contenue dans l\u2019Univers\u00a0\u00e9tait constitu\u00e9e d\u2019atomes, mol\u00e9cules, protons, neutrons, quarks, gluons, photons… et que tout \u00e7a n\u2019avait plus de secret pour nous.<\/p>\n

Mais aujourd\u2019hui\u00a0:<\/strong>
\n\u2014 on donne \u00e0 l\u2019Univers un \u00e2ge de 13,8 milliards d\u2019ann\u00e9es, \u00e0 plus ou moins 20 millions d\u2019ann\u00e9es pr\u00e8s.
\n\u2014 on compte\u00a0toujours les galaxies et on en est \u00e0 pr\u00e8s de deux mille milliards.
\n\u2014 on sait que tout le fatras bien connu des \u00e9lectrons et compagnie ne repr\u00e9sente que 5% de la mati\u00e8re contenue dans l\u2019Univers, le reste \u00e9tant de la mati\u00e8re noire pour un petit tiers, dont on ne sait pas grand chose, et de l\u2019\u00e9nergie noire pour deux gros tiers, dont on sait encore moins.<\/p>\n

Comme quoi, il y a quarante ans, on \u00e9tait tr\u00e8s con, mais qu’aujourd\u2019hui, \u00e7a va beaucoup mieux.
\nMais ne la ramenez pas trop : consid\u00e9rez juste une instant votre place dans l’univers :<\/p>\n

\"\"<\/p>\n

De temps en temps, il n’est pas mauvais de rappeler les ordres de grandeur et de remettre les choses (et vous avec) \u00e0 leur vraie place.<\/em><\/strong><\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Attention, ne vous y trompez pas, ceci n\u2019est pas un article de vulgarisation, c\u2019est juste le recueil de quelques faits av\u00e9r\u00e9s qui vous permettront de briller en soci\u00e9t\u00e9 (mais pas bien longtemps). Il y a cinquante ans : \u2014 on avait calcul\u00e9 que l\u2019Univers avait 13 milliards d\u2019ann\u00e9es. \u2014 on estimait le nombre de galaxies … Continuer la lecture de L’Univers fait des progr\u00e8s<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[6],"tags":[1863],"class_list":["post-56789","post","type-post","status-publish","format-standard","hentry","category-news","tag-rediffusion"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/posts\/56789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=56789"}],"version-history":[{"count":9,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/posts\/56789\/revisions"}],"predecessor-version":[{"id":56839,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=\/wp\/v2\/posts\/56789\/revisions\/56839"}],"wp:attachment":[{"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=56789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=56789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leblogdescoutheillas.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=56789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}