{"id":962,"date":"2006-01-20T13:09:00","date_gmt":"2006-01-20T12:09:00","guid":{"rendered":"https:\/\/kids.esa.int\/pluto\/"},"modified":"2026-10-08T00:34:16","modified_gmt":"2026-10-07T22:34:16","slug":"pluto","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/pluto\/","title":{"rendered":"Pluto"},"content":{"rendered":"
\n

Pluton l\u00f6ysi vuonna 1930 24-vuotias Clyde Tombaugh, joka k\u00e4ytti erityist\u00e4 laitetta taivaskuvien vertailuun. Se osoittautui pieneksi taivaankappaleeksi, jopa pienemm\u00e4ksi kuin oma Kuumme.<\/p>\n<\/div>\n

Pluto kiert\u00e4\u00e4 elliptist\u00e4 (munanmuotoista) kiertorataa, jonka et\u00e4isyys vaihtelee 7 381 miljoonan kilometrin (49 Aurinko\u2013Maa-et\u00e4isyyden) ja 4 446 miljoonan kilometrin (30 Aurinko\u2013Maa-et\u00e4isyyden) v\u00e4lill\u00e4. Koska yksi kierto kest\u00e4\u00e4 248 vuotta, kukaan Plutolla syntynyt ei koskaan juhlisi yht\u00e4\u00e4n syntym\u00e4p\u00e4iv\u00e4\u00e4!<\/p>\n

Plutosta tiedet\u00e4\u00e4n hyvin v\u00e4h\u00e4n. Sen pinta on \u00e4\u00e4rimm\u00e4isen kylm\u00e4 (-230 astetta C) ja n\u00e4ytt\u00e4\u00e4 olevan j\u00e4\u00e4peitteen alla. Viime vuosina se on ollut melko l\u00e4hell\u00e4 Aurinkoa ja nauttinut lyhyest\u00e4 kes\u00e4st\u00e4. Pinnan j\u00e4\u00e4 on h\u00f6yrystynyt ja muodostanut ohuen ilmakeh\u00e4n. Se on kuitenkin nyt vet\u00e4ytym\u00e4ss\u00e4 aurinkokunnan kylmiin syvyyksiin, ja t\u00e4m\u00e4 ilmakeh\u00e4 j\u00e4\u00e4tyy pian uudelleen.<\/p>\n

Pluto py\u00f6rii \u201cvastaanp\u00e4in\u201d (id\u00e4st\u00e4 l\u00e4nteen) kerran 6 p\u00e4iv\u00e4ss\u00e4 ja 9 tunnissa. Sen suurimmalla kuulla, Charonilla, kest\u00e4\u00e4 yht\u00e4 kauan kiert\u00e4\u00e4 Plutoa. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 kukaan, joka asuisi Pluton toisella puolella, ei koskaan n\u00e4kisi Charonia. Hubble-avaruusteleskoopilla on \u00e4skett\u00e4in l\u00f6ydetty kaksi pienemp\u00e4\u00e4 kuuta.<\/p>\n

Monien vuosien ajan Plutoa pidettiin Aurinkoa l\u00e4himp\u00e4n\u00e4 olevana yhdeks\u00e4nten\u00e4 planeettana (vaikka se toisinaan l\u00e4hestyy Aurinkoa Neptunusta l\u00e4hemp\u00e4\u00e4). Nyky\u00e4\u00e4n sit\u00e4 pidet\u00e4\u00e4n \u201ck\u00e4\u00e4pi\u00f6planeettana\u201d. Se on my\u00f6s yksi Kuiperin vy\u00f6hykkeen suurimmista kappaleista; kyseess\u00e4 on j\u00e4\u00e4maailmoista koostuva ryhm\u00e4, joka sijaitsee Neptunuksen takana.<\/p>","protected":false},"excerpt":{"rendered":"

Pluto was discovered in 1930 by 24 year-old Clyde Tombaugh, who was using a special machine to compare photos of the sky. It turned out to be a tiny world, […]<\/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\/2006\/01\/pluto2\/17879328-2-eng-GB\/Pluto.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\/2006\/01\/Pluto2","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-962","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\/962","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=962"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/962\/revisions"}],"predecessor-version":[{"id":2105,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/962\/revisions\/2105"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=962"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=962"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=962"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=962"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=962"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=962"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=962"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=962"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=962"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=962"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}