{"id":667,"date":"2011-07-05T08:31:00","date_gmt":"2011-07-05T06:31:00","guid":{"rendered":"https:\/\/kids.esa.int\/spacewalks\/"},"modified":"2026-10-08T00:30:56","modified_gmt":"2026-10-07T22:30:56","slug":"spacewalks","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/spacewalks\/","title":{"rendered":"Avaruusk\u00e4velyt"},"content":{"rendered":"
\n

Kuvittele, ett\u00e4 k\u00e4velet avaruudessa ja liid\u00e4t Maan ymp\u00e4ri yli 27 000 km\/h:n vauhdilla! Juuri t\u00e4m\u00e4n ovat kokeneet sadat avaruusk\u00e4velij\u00e4t viimeisten 50 vuoden aikana. Avaruusk\u00e4velyt (viralliselta nimelt\u00e4\u00e4n Extravehicular Activity eli EVA) ovat olennainen osa avaruusty\u00f6t\u00e4. Niit\u00e4 k\u00e4ytet\u00e4\u00e4n uusien laitteiden ja kokeiden asentamiseen sek\u00e4 korjaust\u00f6iden suorittamiseen. Kansainv\u00e4lisen avaruusaseman rakentamiseen ja yll\u00e4pitoon on tarvittu l\u00e4hes 1 000 tuntia avaruusk\u00e4velyj\u00e4 vuodesta 1998 l\u00e4htien.<\/p>\n<\/div>\n

Avaruusk\u00e4velij\u00e4t pukeutuvat suojapukuihin, kun he astuvat ilmanpaineettomaan avaruuteen. N\u00e4iss\u00e4 puvuissa on useita eri kerroksia, jotka pit\u00e4v\u00e4t k\u00e4ytt\u00e4j\u00e4n ruumiinl\u00e4mm\u00f6n sopivana, mahdollistavat hengitt\u00e4misen ja suojaavat haitalliselta s\u00e4teilylt\u00e4. Pukujen sis\u00e4ll\u00e4 hapen paine on alhaisempi kuin avaruusasemalla. T\u00e4m\u00e4n vuoksi astronauttien on vietett\u00e4v\u00e4 noin nelj\u00e4 tuntia happea hengitt\u00e4en ilmalukossa, ennen kuin he voivat astua ulos.<\/p>\n

ISS:ll\u00e4 on varastoituna kaksi erilaista painepukua. Amerikkalaisessa puvussa on kaksi osaa: kova yl\u00e4vartalo-osa ja joustava alavartalo-osa. N\u00e4m\u00e4 osat yhdistyv\u00e4t vy\u00f6t\u00e4r\u00f6ll\u00e4. Astronautin jalat ty\u00f6nnet\u00e4\u00e4n housuihin, mink\u00e4 j\u00e4lkeen k\u00e4det ja yl\u00e4vartalo asetetaan yl\u00e4osaan. Ven\u00e4l\u00e4isess\u00e4 puvussa on kova yl\u00e4osa, jossa on takaluukku ja johon on sijoitettu my\u00f6s elossapitoj\u00e4rjestelm\u00e4. T\u00e4m\u00e4n ansiosta puku on helpompi pukea yhdell\u00e4 k\u00e4dell\u00e4. Molemmissa puvuissa on erilliset k\u00e4sineet ja kyp\u00e4r\u00e4t.<\/p>\n

Avaruusk\u00e4velij\u00f6it\u00e4 kuljetetaan usein paikasta toiseen robottivarren p\u00e4\u00e4ss\u00e4. Liikkumista helpottavat my\u00f6s erityiset kaiteet. Jotta he eiv\u00e4t leijuisi pois ja katoaisi avaruuteen, heid\u00e4t on kiinnitetty avaruusasemaan ohuilla naruilla. Avaruusk\u00e4velyt voivat kest\u00e4\u00e4 useita tunteja. Enn\u00e4tys on Susan Helmsin ja James Vossin hallussa: he viettiv\u00e4t maaliskuussa 2001 l\u00e4hes 9 tuntia avaruudessa.<\/p>","protected":false},"excerpt":{"rendered":"

Imagine walking in space and flying around the Earth at more than 27,000 km\/h! This is what hundreds of spacewalkers have experienced in the last 50 years. Spacewalks (officially known […]<\/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\/2010\/10\/esa_astronaut_christer_fuglesang2\/17910714-2-eng-GB\/ESA_astronaut_Christer_Fuglesang.jpg","esa_banner_description":"","esa_banner_credit":"NASA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/10\/ESA_astronaut_Christer_Fuglesang2","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-667","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\/667","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=667"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/667\/revisions"}],"predecessor-version":[{"id":1810,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/667\/revisions\/1810"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=667"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=667"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=667"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=667"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=667"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=667"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=667"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=667"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=667"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=667"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}