{"id":906,"date":"2004-11-19T09:13:00","date_gmt":"2004-11-19T08:13:00","guid":{"rendered":"https:\/\/kids.esa.int\/gravity_and_weightlessness\/"},"modified":"2026-10-08T00:33:36","modified_gmt":"2026-10-07T22:33:36","slug":"gravity_and_weightlessness","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/gravity_and_weightlessness\/","title":{"rendered":"Apesanteur"},"content":{"rendered":"
\n

Dans notre vie de tous les jours, nous pouvons nous asseoir, marcher, ramasser quelque chose sur le sol ou nous allonger sur un lit. Rien de tout cela n'est possible en orbite.<\/p>\n<\/div>\n

D\u00e8s qu\u2019un vaisseau spatial atteint son orbite, tout ce qui est \u00e0 l'int\u00e9rieur semble d\u00e9pourvu de poids. Tout ce qui n'est pas fix\u00e9 flotte.<\/p>\n

Les astronautes commencent \u00e0 ressentir les effets de l'apesanteur \u00e0 l'arr\u00eat des moteurs fus\u00e9e. Imm\u00e9diatement, ils commencent \u00e0 flotter, maintenus seulement par leurs ceintures de s\u00e9curit\u00e9. L'apesanteur permet aux astronautes de sembler tr\u00e8s forts. Ils peuvent soulever des objets qui seraient bien trop lourds \u00e0 d\u00e9placer sur Terre. Mais il y a des inconv\u00e9nients.<\/p>\n

En l'absence de gravit\u00e9, le sang et les autres fluides corporels se dirigent vers la t\u00eate. Cela peut cr\u00e9er une sensation d'oppression et des maux de t\u00eate. En l'absence de gravit\u00e9 \u00e0 combattre, les os et les muscles s'affaiblissent. Pour rester en forme, les astronautes doivent faire plusieurs heures d'exercice par jour. Cela leur permet de r\u00e9cup\u00e9rer plus rapidement \u00e0 leur retour sur Terre.<\/p>\n

Dans une station spatiale ou une navette, il n'y a ni haut ni bas. Il n'y a aucune diff\u00e9rence entre un plancher et un plafond. Ceci peut troubler les astronautes le temps qu'ils s'habituent \u00e0 cette disposition curieuse.<\/p>","protected":false},"excerpt":{"rendered":"

Our everyday lives involve such activities as sitting, walking, picking up things from the ground and lying in bed. None of these activities are possible in orbit. Once a spacecraft […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2003\/03\/parabolic_flight_picture-72\/17902825-2-eng-GB\/Parabolic_Flight_picture-7.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/03\/Parabolic_Flight_picture-72","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,13,63],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-906","post","type-post","status-publish","format-standard","hentry","category-learn","category-life-in-space","category-living-in-space","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/906","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=906"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/906\/revisions"}],"predecessor-version":[{"id":2049,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/906\/revisions\/2049"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=906"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=906"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=906"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=906"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=906"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=906"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=906"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}