{"id":837,"date":"2004-12-02T15:55:00","date_gmt":"2004-12-02T14:55:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_first_rockets\/"},"modified":"2026-10-08T00:32:50","modified_gmt":"2026-10-07T22:32:50","slug":"the_first_rockets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_first_rockets\/","title":{"rendered":"Ensimm\u00e4iset raketit"},"content":{"rendered":"<div class=\"lede\">\n<p>Kaikki maapallolla \u2013 me mukaan lukien \u2013 pysyy paikallaan painovoiman ansiosta. Ilman painovoimaa me kaikki leijuisimme avaruuteen. Sanotaan, ett\u00e4 Isaac Newton l\u00f6ysi painovoiman, kun omena putosi h\u00e4nen p\u00e4\u00e4h\u00e4ns\u00e4.<\/p>\n<\/div>\n<p>P\u00e4\u00e4st\u00e4ksemme avaruuteen k\u00e4yt\u00e4mme rakettik\u00e4ytt\u00f6ist\u00e4 laukaisualustaa, jolla voimme voittaa Maan painovoiman. Ajoittain on esitetty my\u00f6s muita ideoita. Vuonna 1865 tieteiskirjailija Jules Verne ehdotti voimakkaan tykin k\u00e4ytt\u00f6\u00e4 ihmisten l\u00e4hett\u00e4miseksi Kuuhun. Viime aikoina tutkijat ovat tutkineet voimakkaiden magneettien k\u00e4ytt\u00f6\u00e4 avaruusaluksen l\u00e4hett\u00e4miseksi kiertoradalle.<\/p>\n<p>Raketteja on ollut olemassa jo kauan. Ne keksittiin Kiinassa yli 800 vuotta sitten. Ensimm\u00e4iset raketit olivat hyvin yksinkertaisia \u2013 pahviputki, joka oli t\u00e4ytetty ruudilla ja kiinnitetty ohjauspuikkoon \u2013 samanlaisia kuin nykyisin k\u00e4ytt\u00e4m\u00e4mme ilotulitteet.<\/p>\n<p>Vuonna 1232 kiinalaiset k\u00e4yttiv\u00e4t n\u00e4it\u00e4 \u2018tulinuolia\u2019 voittaakseen hy\u00f6kk\u00e4\u00e4v\u00e4n mongolien armeijan. Tieto rakettien valmistuksesta levisi pian L\u00e4hi-it\u00e4\u00e4n ja Eurooppaan, miss\u00e4 niit\u00e4 k\u00e4ytettiin my\u00f6s aseina. My\u00f6hemmin ne tulivat suosituiksi my\u00f6s n\u00e4ytt\u00e4viin ilotulitusn\u00e4yt\u00f6ksiin.<\/p>","protected":false},"excerpt":{"rendered":"<p>Everything on Earth \u2013 including us \u2013 is held down by the force of gravity. Without gravity, we would all float off into space. It is said that Isaac Newton [&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\/rockets_fireworks_cartoon2\/17907457-2-eng-GB\/Rockets_fireworks_cartoon.gif","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\/Rockets_fireworks_cartoon2","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-837","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\/837","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=837"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/837\/revisions"}],"predecessor-version":[{"id":1980,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/837\/revisions\/1980"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=837"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=837"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=837"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=837"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=837"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=837"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=837"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}