{"id":48055,"date":"2026-10-30T18:15:00","date_gmt":"2026-10-30T16:15:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=48055"},"modified":"2026-11-02T08:37:07","modified_gmt":"2026-11-02T06:37:07","slug":"dismoipourquoi-le-ciel-est-bleu","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/10\/30\/dismoipourquoi-le-ciel-est-bleu\/","title":{"rendered":"[#DisMoiPourquoi] Le ciel est bleu ?"},"content":{"rendered":"<div class=\"intext\"> Patrycja 10 ans, \u00e9cole Les Salins d\u2019Hy\u00e8res\n              <\/div>\n<div class=\"paragraph\">\n<p>\u00ab Le ciel est bleu d\u2019une part \u00e0 cause de la lumi\u00e8re que le soleil nous envoie et d\u2019autre part \u00e0 cause de l\u2019atmosph\u00e8re qui nous entoure. Le soleil \u00e9met de la lumi\u00e8re et dans cette lumi\u00e8re on trouve plein de couleurs : ce sont entre autres toutes les couleurs de l\u2019arc-en-ciel et aussi d\u2019autres lumi\u00e8res que l\u2019on ne peut pas voir avec nos yeux, comme les infrarouges ou les ultraviolets. Dans l\u2019espace, les rayons du soleil voyagent en ligne droite et lorsqu\u2019ils arrivent \u00e0 proximit\u00e9 de la terre, ils rencontrent l\u2019atmosph\u00e8re. L\u2019atmosph\u00e8re, c\u2019est l\u2019enveloppe gazeuse qui entoure la terre et dans laquelle on vit. On y trouve plusieurs gaz : du dioxyg\u00e8ne, du diazote, du CO2 et d\u2019autres gaz. Lorsque les rayons du soleil arrivent, ils vont interagir avec ces mol\u00e9cules de gaz et il se passe un ph\u00e9nom\u00e8ne de diffusion de la lumi\u00e8re. Une partie de la lumi\u00e8re va \u00eatre renvoy\u00e9e dans toutes les directions du ciel, un peu comme si elle \u00e9tait d\u00e9vi\u00e9e de sa trajectoire. Ce ph\u00e9nom\u00e8ne de diffusion de la lumi\u00e8re est beaucoup plus intense pour le bleu que pour des couleurs comme le rouge ou le orange. Le rouge et le orange vont continuer leur route en ligne droite, tandis que le bleu va \u00eatre renvoy\u00e9 partout dans le ciel et va illuminer le ciel en bleu.\u00a0\u00bb<\/p>\n<p><b>Marin Fouchier. Doctorant en physique \u00e0 l\u2019Institut Fresnel <\/b><\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"&laquo; Le ciel est bleu d&rsquo;une part &agrave; cause de la lumi&egrave;re que le soleil nous envoie et d&rsquo;autre part &agrave; cause de l&rsquo;atmosph&egrave;re qui nous entoure. Le soleil &eacute;met de la lumi&egrave;re et dans cette &#8230;","protected":false},"author":1,"featured_media":48056,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[918,3926,3925,20],"tags":[2543,225,2976,803,890,27,172,3291,943,198,946,4931,420,31],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-48055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil","category-accueil-merge","category-accueil-third","category-societe","tag-dismoipourquoi","tag-ciel","tag-co2","tag-ecole","tag-gaz","tag-hyeres","tag-les-petits-debrouillards","tag-les-salins","tag-lumiere","tag-orange","tag-physique","tag-relance","tag-scientifique","tag-var","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/48055","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=48055"}],"version-history":[{"count":2,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/48055\/revisions"}],"predecessor-version":[{"id":48094,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/48055\/revisions\/48094"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/48056"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=48055"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=48055"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=48055"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=48055"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=48055"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=48055"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=48055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}