{"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\/fi\/gravity_and_weightlessness\/","title":{"rendered":"Painovoima ja painottomuus"},"content":{"rendered":"<div class=\"lede\">\n<p>Jokap\u00e4iv\u00e4iseen el\u00e4m\u00e4\u00e4mme kuuluu esimerkiksi istumista, k\u00e4vely\u00e4, esineiden nostamista maasta ja s\u00e4ngyss\u00e4 makoilua. Mik\u00e4\u00e4n n\u00e4ist\u00e4 toiminnoista ei ole mahdollista kiertoradalla.<\/p>\n<\/div>\n<p>Kun avaruusalus saavuttaa kiertoradan, sen sis\u00e4ll\u00e4 kaikki n\u00e4ytt\u00e4\u00e4 olevan painottomassa tilassa. Mik\u00e4 tahansa (tai kuka tahansa), jota ei ole kiinnitetty paikoilleen, leijuu ilmassa.<\/p>\n<p>Astronautit tuntevat painottomuuden vaikutuksen ensimm\u00e4isen kerran, kun rakettimoottorit sammutetaan. Heti sen j\u00e4lkeen he alkavat leijua, ja vain turvavy\u00f6t pit\u00e4v\u00e4t heid\u00e4t paikoillaan. Painottomuuden ansiosta astronautit vaikuttavat eritt\u00e4in vahvoilta. He pystyv\u00e4t nostamaan esineit\u00e4, jotka olisivat maapallolla aivan liian painavia siirrett\u00e4viksi. Mutta siin\u00e4 on my\u00f6s joitakin haittoja.<\/p>\n<p>Ilman painovoiman vaikutusta veri ja muut kehon nesteet alkavat virrata kohti p\u00e4\u00e4t\u00e4. T\u00e4m\u00e4 voi aiheuttaa tukkoisuuden tunnetta ja p\u00e4\u00e4ns\u00e4rky\u00e4. Kun painovoimaa ei ole vastustamaan, luut ja lihakset voivat heikenty\u00e4. Pysy\u00e4kseen kunnossa heid\u00e4n on harjoiteltava useita tunteja p\u00e4ivitt\u00e4in. N\u00e4in he toipuvat nopeammin palatessaan Maahan.<\/p>\n<p>Sukkulassa tai avaruusasemalla ei ole yl\u00e4- eik\u00e4 alapuolta. Lattian ja katon v\u00e4lill\u00e4 ei ole eroa. T\u00e4m\u00e4 voi aiheuttaa astronautille pahoinvointia, kunnes he tottuvat t\u00e4h\u00e4n outoon tilanteeseen.<\/p>","protected":false},"excerpt":{"rendered":"<p>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 [&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\/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\/fi\/wp-json\/wp\/v2\/posts\/906","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=906"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/906\/revisions"}],"predecessor-version":[{"id":2049,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/906\/revisions\/2049"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=906"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=906"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=906"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=906"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=906"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=906"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=906"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}