{"id":836,"date":"2004-12-02T15:57:00","date_gmt":"2004-12-02T14:57:00","guid":{"rendered":"https:\/\/kids.esa.int\/how_does_a_rocket_work\/"},"modified":"2026-10-08T00:32:49","modified_gmt":"2026-10-07T22:32:49","slug":"how_does_a_rocket_work","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/how_does_a_rocket_work\/","title":{"rendered":"Miten raketti toimii?"},"content":{"rendered":"<div class=\"lede\">\n<p>Oletko huomannut, mit\u00e4 tapahtuu, kun p\u00e4\u00e4st\u00e4t ilman pois ilmapallosta? Ilma virtaa yhteen suuntaan ja ilmapallo liikkuu vastakkaiseen suuntaan. Raketit toimivat suurin piirtein samalla tavalla. Moottorin suuttimesta suurella nopeudella ulosvirtaavat pakokaasut ty\u00f6nt\u00e4v\u00e4t rakettia eteenp\u00e4in.<\/p>\n<\/div>\n<p>Useimmat nykyaikaiset kantoraketit, kuten eurooppalainen Ariane 5, ovat eritt\u00e4in monimutkaisia ja painavat laukaisun hetkell\u00e4 satoja tonneja. Suurin osa t\u00e4st\u00e4 painosta on polttoainetta, kuten nestem\u00e4ist\u00e4 vety\u00e4 ja nestem\u00e4ist\u00e4 happea.<\/p>\n<p>Raketit tarvitsevat valtavasti polttoainetta voittaakseen Maan painovoiman. Vasta kun ne saavuttavat 28 000 km\/h:n nopeuden, ne liikkuvat riitt\u00e4v\u00e4n nopeasti p\u00e4\u00e4st\u00e4kseen kiertoradalle.<\/p>\n<p>Useimmat raketit koostuvat kahdesta tai kolmesta vaiheesta. Kun vaihe on kuluttanut kaiken polttoaineensa, se irrotetaan raketista ylim\u00e4\u00e4r\u00e4isen painon poistamiseksi. Sen j\u00e4lkeen se putoaa takaisin (yleens\u00e4 mereen ja kauas asutuista alueista) tai palaa loppuun ilmakeh\u00e4ss\u00e4.<\/p>\n<p>Suuret kantoraketit saavat usein lis\u00e4vauhtia ensimm\u00e4iseen vaiheeseen kiinnitetyist\u00e4 raketeista. N\u00e4m\u00e4 voivat k\u00e4ytt\u00e4\u00e4 kiinte\u00e4\u00e4 tai nestem\u00e4ist\u00e4 polttoainetta. My\u00f6s ne heitet\u00e4\u00e4n yleens\u00e4 pois.<\/p>","protected":false},"excerpt":{"rendered":"<p>Have you noticed what happens if you let the air out of a balloon? The air goes one way and the balloon moves in the opposite direction. Rockets work in [&hellip;]<\/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\/2004\/12\/balloons2\/17894905-2-eng-GB\/balloons.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\/2004\/12\/balloons2","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":[10,41,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-836","post","type-post","status-publish","format-standard","hentry","category-learn","category-rockets-technology","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=836"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/836\/revisions"}],"predecessor-version":[{"id":1979,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/836\/revisions\/1979"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=836"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=836"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=836"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=836"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=836"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=836"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=836"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}