{"id":924,"date":"2006-01-20T13:14:00","date_gmt":"2006-01-20T12:14:00","guid":{"rendered":"https:\/\/kids.esa.int\/venus\/"},"modified":"2026-10-08T00:33:50","modified_gmt":"2026-10-07T22:33:50","slug":"venus","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/venus\/","title":{"rendered":"Venus"},"content":{"rendered":"
\n

Venus on Auringosta laskettuna toinen planeetta, joten se on taivaalla aina melko l\u00e4hell\u00e4 Aurinkoa. Se n\u00e4kyy kirkkaana aamu- tai iltat\u00e4hden\u00e4 \u2013 se on Kuun j\u00e4lkeen y\u00f6taivaan kirkkain kohde. Kaukoputkella voidaan havaita, ett\u00e4 se k\u00e4y l\u00e4pi vaiheita aivan kuten Kuu.<\/p>\n<\/div>\n

Venus on niin kirkas, koska se on pilvien peitossa, jotka heijastavat suuren osan siihen saapuvasta auringonvalosta. Keltahtavat pilvet koostuvat rikkist\u00e4 ja rikkihaposta.<\/p>\n

Joissakin suhteissa Venus on Maan kaksoisplaneetta. Se on suunnilleen saman kokoinen ja koostuu samoista kiviaineksista. Se on my\u00f6s l\u00e4hemp\u00e4n\u00e4 meit\u00e4 kuin mik\u00e4\u00e4n muu planeetta. Se on kuitenkin peitetty paksulla hiilidioksidipitoisella ilmakeh\u00e4ll\u00e4 \u2013 kaasulla, jota me hengit\u00e4mme ulos. T\u00e4m\u00e4 ilmakeh\u00e4 on niin tihe\u00e4, ett\u00e4 sen l\u00e4pi k\u00e4veleminen olisi kuin kahlaamista vedess\u00e4.<\/p>\n

Hiilidioksidi pid\u00e4tt\u00e4\u00e4 suurimman osan auringon l\u00e4mm\u00f6st\u00e4. Pilvikerrokset toimivat my\u00f6s peitteen\u00e4. Tuloksena on \u201ckarkuun karannut kasvihuoneilmi\u00f6\u201d, joka on saanut planeetan l\u00e4mp\u00f6tilan kohoamaan 465 \u00b0C:een, mik\u00e4 on tarpeeksi kuumaa lyijyn sulattamiseen. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 Venus on jopa kuumempi kuin Merkurius.<\/p>\n

Ilman erityist\u00e4 suojausta Venukseen saapuva vierailija kuolisi v\u00e4litt\u00f6m\u00e4sti \u2013 valtava ilmanpaine murskaisi h\u00e4net, ilmakeh\u00e4 tukahduttaisi h\u00e4net, polttava kuumuus paistaisi h\u00e4net karrelle ja happo liuottaisi h\u00e4net.<\/p>\n

Venuksen pinta on kartoitettu tutkalla. Kartat paljastavat tuhansia tulivuoria ja t\u00f6rm\u00e4yskraattereita. Siell\u00e4 on kaksi p\u00e4\u00e4asiallista yl\u00e4nk\u00f6aluetta, joista toisessa sijaitsee vuorijono, joka on korkeampi kuin Mount Everest.<\/p>\n

Kymmeni\u00e4 avaruusluotaimia on vieraillut Venuksessa, mutta monia mysteerej\u00e4 on edelleen j\u00e4ljell\u00e4. ESA:n Venus Express on kiert\u00e4nyt planeettaa l\u00e4hes polaarisella kiertoradalla saapumisestaan l\u00e4htien huhtikuussa 2006. Suurin osa sen mittalaitteista on tutkinut tihe\u00e4\u00e4 ilmakeh\u00e4\u00e4 ja nopeasti liikkuvia pilvi\u00e4 tai selvitt\u00e4nyt, miten Aurinko vaikuttaa planeettaan. Sen infrapunasensori on kuitenkin pystynyt kartoittamaan my\u00f6s osan pinnasta ja osoittamaan, ett\u00e4 Maan naapurilla saattaa olla aktiivisia tulivuoria.<\/p>","protected":false},"excerpt":{"rendered":"

Venus is the second planet from the Sun, so it is always fairly close to the Sun in the sky. It appears as a brilliant morning or evening \u201cstar\u201d \u2013 […]<\/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\/2002\/01\/venus_in_ultraviolet_light2\/17863345-3-eng-GB\/Venus_in_ultraviolet_light.jpg","esa_banner_description":"Venus in ultraviolet light","esa_banner_credit":"L. Esposito (University of Colorado, Boulder), and NASA\/ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/01\/Venus_in_ultraviolet_light2","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":[10,11,12],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-924","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/924","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=924"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/924\/revisions"}],"predecessor-version":[{"id":2067,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/924\/revisions\/2067"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=924"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=924"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=924"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=924"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=924"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=924"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=924"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=924"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=924"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}