{"id":1101,"date":"2005-12-09T13:07:00","date_gmt":"2005-12-09T12:07:00","guid":{"rendered":"https:\/\/kids.esa.int\/moons_and_rings\/"},"modified":"2026-10-08T00:36:01","modified_gmt":"2026-10-07T22:36:01","slug":"moons_and_rings","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/moons_and_rings\/","title":{"rendered":"Kuut ja renkaat"},"content":{"rendered":"
\n

Kaikki planeetat kiert\u00e4v\u00e4t Aurinkoa vastap\u00e4iv\u00e4\u00e4n \u2013 katsottuna ylh\u00e4\u00e4lt\u00e4 Maan pohjoisnavalta. Niiden vuosi \u2013 eli aika, jonka ne tarvitsevat yhden kierroksen suorittamiseen \u2013 vaihtelee niiden et\u00e4isyyden mukaan Auringosta. Vuosi Merkuriuksella kest\u00e4\u00e4 vain 88 maap\u00e4iv\u00e4\u00e4, joten siell\u00e4 syntynyt henkil\u00f6 juhlisi nelj\u00e4 kertaa niin monta syntym\u00e4p\u00e4iv\u00e4\u00e4 kuin me Maassa. Sen sijaan vuosi Plutolla vastaa 248 maavuottamme. Plutolla syntynyt henkil\u00f6 ei juhlisi koskaan syntym\u00e4p\u00e4iv\u00e4\u00e4!<\/p>\n<\/div>\n

Venuksella ja Merkuriuksella ei ole luonnollisia satelliitteja, mutta kaikkien seitsem\u00e4n muun planeetan ymp\u00e4rill\u00e4 kiert\u00e4\u00e4 kuita. T\u00e4h\u00e4n menness\u00e4 on kirjattu yhteens\u00e4 138 kuuta. Suurin osa kuista on hyvin pieni\u00e4 ja vaikeasti havaittavissa jopa suurilla kaukoputkilla. T\u00e4ll\u00e4 hetkell\u00e4 enn\u00e4tyksen haltija on Jupiter, jolla on 63 tunnettua kuuta. Niihin kuuluu nelj\u00e4 planeetan kokoista kuuta \u2013 Ganymede (aurinkokunnan suurin kuu), Callisto, Europa ja Io.<\/p>\n

My\u00f6s muiden kaasuj\u00e4ttil\u00e4isten voimakas painovoima on houkutellut suuren m\u00e4\u00e4r\u00e4n kuita: Saturnuksella on 31, Uranuksella 27 ja Neptunuksella 13. Sek\u00e4 Maata ett\u00e4 Plutoa kiert\u00e4\u00e4 yksi suuri kuu.<\/p>\n

Nelj\u00e4ll\u00e4 suurimmalla planeetalla \u2013 Jupiterilla, Saturnuksella, Uranuksella ja Neptunuksella \u2013 on my\u00f6s renkaat. Ne koostuvat j\u00e4\u00e4- ja kivenpalasista, joiden koko vaihtelee vuorten kokoisista savukkeen savun kokoisiksi. Renkaat voivat olla hajonneen kuun j\u00e4\u00e4nteit\u00e4 tai palasia, jotka ovat irronneet l\u00e4heisist\u00e4 kuista.<\/p>","protected":false},"excerpt":{"rendered":"

All of the planets travel around the Sun in a counter-clockwise direction \u2013 as seen from above Earth\u2019s north pole. Their year – the time they take to complete one […]<\/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\/2005\/04\/jupiter_s_moon_europa2\/17905460-2-eng-GB\/Jupiter_s_moon_Europa.jpg","esa_banner_description":"Jupiter's moon, Europa","esa_banner_credit":"NASA\/DLR","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/04\/Jupiter_s_moon_Europa2","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-1101","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\/1101","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=1101"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1101\/revisions"}],"predecessor-version":[{"id":2244,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1101\/revisions\/2244"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1101"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1101"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1101"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1101"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1101"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1101"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1101"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}