{"id":900,"date":"2008-12-15T09:35:00","date_gmt":"2008-12-15T08:35:00","guid":{"rendered":"https:\/\/kids.esa.int\/life_on_extrasolar_planets\/"},"modified":"2026-10-08T00:33:33","modified_gmt":"2026-10-07T22:33:33","slug":"life_on_extrasolar_planets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/life_on_extrasolar_planets\/","title":{"rendered":"El\u00e4m\u00e4 aurinkokunnan ulkopuolisilla planeetoilla"},"content":{"rendered":"
\n

Vuonna 2008 NASA:n ja ESA:n yhteinen Hubble-avaruusteleskooppi havaitsi hiilidioksidia toisen t\u00e4hden kiertoradalla olevan, Jupiterin kokoisen planeetan ilmakeh\u00e4ss\u00e4. T\u00e4t\u00e4 pidettiin t\u00e4rke\u00e4n\u00e4 askeleena etsitt\u00e4ess\u00e4 todisteita el\u00e4m\u00e4st\u00e4 muilla planeetoilla.<\/p>\n<\/div>\n

T\u00e4h\u00e4n menness\u00e4 on l\u00f6ydetty noin 300 planeettaa, jotka kiert\u00e4v\u00e4t kaukaisia t\u00e4hti\u00e4. Valitettavasti n\u00e4m\u00e4 aurinkokunnan ulkopuoliset planeetat ovat niin himmeit\u00e4 ja niin kaukana, ett\u00e4 niiden tutkiminen on eritt\u00e4in vaikeaa. Nykyaikaisten laitteiden avulla tutkijat ovat kuitenkin v\u00e4hitellen alkaneet oppia lis\u00e4\u00e4 n\u00e4ist\u00e4 vieraista maailmoista ja niiden ilmakeh\u00e4n muodostavista kaasuista.<\/p>\n

Hiilidioksidi on kaasu, jota kasvit tuottavat y\u00f6ll\u00e4 ja jota ne k\u00e4ytt\u00e4v\u00e4t kasvuunsa. El\u00e4imet ja ihmiset hengitt\u00e4v\u00e4t sit\u00e4 ulos muutaman sekunnin v\u00e4lein. Yhten\u00e4 t\u00e4rkeimmist\u00e4 kasvihuonekaasuista se sitoo l\u00e4mp\u00f6\u00e4 ja edist\u00e4\u00e4 planeetan l\u00e4mpenemist\u00e4. Hiili on my\u00f6s niin sanottujen orgaanisten yhdisteiden perusta, ja n\u00e4m\u00e4 yhdisteet kuuluvat el\u00e4m\u00e4n rakennuspalikoihin. Hubble-avaruusteleskooppi on nyt osoittanut, ett\u00e4 voimme havaita hiilidioksidia kaukaisilla planeetoilla ja arvioida, kuinka paljon sit\u00e4 on l\u00e4sn\u00e4. T\u00e4m\u00e4 on merkitt\u00e4v\u00e4 edistysaskel pitk\u00e4j\u00e4nteisess\u00e4 pyrkimyksess\u00e4 selvitt\u00e4\u00e4, mist\u00e4 n\u00e4m\u00e4 maailmat koostuvat ja voisivatko ne tukea el\u00e4m\u00e4\u00e4.<\/p>\n

HD 189733b -niminen planeetta on liian kuuma el\u00e4m\u00e4lle. Se on kuitenkin hyv\u00e4 tutkimuskohde, koska se katoaa kumppanit\u00e4htens\u00e4 taakse kerran 2,2 p\u00e4iv\u00e4ss\u00e4. Tutkimalla Maahan saapuvan valon s\u00e4\u00e4nn\u00f6llisi\u00e4 muutoksia tutkijat voivat analysoida planeetan ilmakeh\u00e4\u00e4. Siit\u00e4 on jo l\u00f6ydetty vesih\u00f6yry\u00e4 ja metaania. Uudet Hubble-havainnot osoittavat, ett\u00e4 el\u00e4m\u00e4n kannalta v\u00e4ltt\u00e4m\u00e4tt\u00f6mi\u00e4 kemiallisia aineita voidaan mitata muiden t\u00e4htien kiertoradalla olevilta planeetoilta.<\/p>","protected":false},"excerpt":{"rendered":"

In 2008, the NASA\/ESA Hubble Space Telescope discovered carbon dioxide in the atmosphere of a Jupiter-sized planet orbiting another star. This was seen as an important step in the search […]<\/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\/2008\/12\/hd_189733b2\/18246735-2-eng-GB\/HD_189733b.jpg","esa_banner_description":"HD 189733b","esa_banner_credit":"ESA, NASA, M. Kornmesser (ESA\/Hubble) and STScI","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/12\/HD_189733b2","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":[14,10,13],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-900","post","type-post","status-publish","format-standard","hentry","category-are-we-alone","category-learn","category-life-in-space"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/900","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=900"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/900\/revisions"}],"predecessor-version":[{"id":2043,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/900\/revisions\/2043"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=900"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=900"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=900"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=900"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=900"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=900"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=900"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}