{"id":1060,"date":"2007-07-12T13:03:00","date_gmt":"2007-07-12T11:03:00","guid":{"rendered":"https:\/\/kids.esa.int\/scientists_find_an_extrasolar_sauna\/"},"modified":"2026-10-08T00:35:27","modified_gmt":"2026-10-07T22:35:27","slug":"scientists_find_an_extrasolar_sauna","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/scientists_find_an_extrasolar_sauna\/","title":{"rendered":"Tutkijat l\u00f6yt\u00e4v\u00e4t aurinkokunnan ulkopuolisen saunan"},"content":{"rendered":"<div class=\"lede\">\n<p>Maapallon ohi lent\u00e4v\u00e4 avaruusolento tuskin voisi olla huomaamatta, ett\u00e4 sininen planeettamme on suurelta osin merien peitossa. Maapallo on kuitenkin ainoa vedell\u00e4 peitetty maailma aurinkokunnassamme. Koska vedell\u00e4 peitetyt planeetat n\u00e4ytt\u00e4v\u00e4t olevan varsin harvinaisia, ei ole yll\u00e4tt\u00e4v\u00e4\u00e4, ett\u00e4 tutkijat ovat innoissaan siit\u00e4, ett\u00e4 kaukaisen t\u00e4hden kiertoradalla olevalta planeetalta on ensimm\u00e4ist\u00e4 kertaa l\u00f6ydetty vett\u00e4 sis\u00e4lt\u00e4v\u00e4 ilmakeh\u00e4.<\/p>\n<\/div>\n<p>T\u00e4llaisia \u2018aurinkokunnan ulkopuolisia\u2019 planeettoja tunnetaan yli 200, mutta vain hyvin harvat niist\u00e4 on kuvattu tai havaittu suoraan. Onneksi osa n\u00e4ist\u00e4 \u2018n\u00e4kym\u00e4tt\u00f6mist\u00e4\u2019 planeetoista voidaan havaita, kun ne kulkevat t\u00e4htens\u00e4 edest\u00e4. N\u00e4in l\u00f6ydettiin vuonna 2005 kaasuj\u00e4ttil\u00e4inen, joka tunnetaan nimell\u00e4 HD 189733b. T\u00e4m\u00e4 Jupiterin kaltainen planeetta aiheutti emot\u00e4hden valon liev\u00e4n himmenemisen.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA (C.Carreau)\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/07\/Transiting_exoplanet_HD_189733b_in_the_infrared2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/07\/transiting_exoplanet_hd_189733b_in_the_infrared2\/17867266-3-eng-GB\/Transiting_exoplanet_HD_189733b_in_the_infrared.jpg\" alt=\"Transiting exoplanet HD 189733b, in the infrared\"><figcaption>Kiert\u00e4v\u00e4 eksoplaneetta HD 189733b infrapunakuvassa<\/figcaption><\/figure>\n<p>Siit\u00e4 l\u00e4htien eurooppalaiset ja amerikkalaiset tutkijat ovat tehneet lis\u00e4tutkimuksia HD 189733b:st\u00e4. He mittasivat NASA:n Spitzer-avaruusteleskoopin avulla t\u00e4hdest\u00e4 tulevaa infrapunas\u00e4teily\u00e4. Kun planeetta liikkui hitaasti t\u00e4hden kiekon poikki, sen ulompi ilmakeh\u00e4 peitti yhden valon aallonpituuden muita aallonpituuksia enemm\u00e4n. Ainoa selitys t\u00e4lle himmenemismallille on vesih\u00f6yryn esiintyminen planeetan ilmakeh\u00e4ss\u00e4.<\/p>\n<p>Valitettavasti t\u00e4ll\u00e4 j\u00e4ttil\u00e4isplaneetalla ei ole kivist\u00e4 pintaa, jolle meret voisivat muodostua. Se kiert\u00e4\u00e4 my\u00f6s t\u00e4hti\u00e4\u00e4n eritt\u00e4in l\u00e4hell\u00e4. Ilmakeh\u00e4n l\u00e4mp\u00f6tilan ollessa yli 700 \u00b0C se on aivan liian kuuma, jotta siell\u00e4 voisi sataa. H\u00f6yryisell\u00e4 HD 189733b:ll\u00e4 ei l\u00e4hes varmasti ole el\u00e4m\u00e4\u00e4. N\u00e4m\u00e4 tulokset her\u00e4tt\u00e4v\u00e4t kuitenkin toiveita siit\u00e4, ett\u00e4 l\u00e4hitulevaisuudessa l\u00f6ydet\u00e4\u00e4n vett\u00e4 sis\u00e4lt\u00e4vi\u00e4, Maan kaltaisia planeettoja.<\/p>","protected":false},"excerpt":{"rendered":"<p>An alien flying past the Earth could hardly fail to notice that our blue planet is largely covered by oceans. However, Earth is the only water-covered world in our Solar [&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\/2007\/07\/transiting_exoplanet_hd_189733b2\/17903269-2-eng-GB\/Transiting_exoplanet_HD_189733b.jpg","esa_banner_description":"Transiting exoplanet HD 189733b","esa_banner_credit":"ESA - C.Carreau","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/07\/Transiting_exoplanet_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-1060","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\/1060","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=1060"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1060\/revisions"}],"predecessor-version":[{"id":4828,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1060\/revisions\/4828"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1060"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1060"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1060"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1060"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1060"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1060"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1060"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}