{"id":580,"date":"2005-12-09T12:29:00","date_gmt":"2005-12-09T11:29:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_solar_system_and_its_planets\/"},"modified":"2026-10-08T00:29:52","modified_gmt":"2026-10-07T22:29:52","slug":"the_solar_system_and_its_planets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_solar_system_and_its_planets\/","title":{"rendered":"Aurinkokunta ja sen planeetat"},"content":{"rendered":"
\n

Aurinkokunta koostuu Auringosta ja kaikista sen ymp\u00e4rill\u00e4 liikkuvista pienemmist\u00e4 kappaleista. Aurinkoa lukuun ottamatta aurinkokunnan suurimmat kappaleet ovat kahdeksan p\u00e4\u00e4planeettaa. Auringon l\u00e4himp\u00e4n\u00e4 ovat nelj\u00e4 melko pient\u00e4, kivist\u00e4 planeettaa \u2013 Merkurius, Venus, Maa ja Mars.<\/p>\n<\/div>\n

Marsin takana sijaitsee asteroidivy\u00f6hyke \u2013 alue, jolla on miljoonia kivisi\u00e4 kappaleita. N\u00e4m\u00e4 ovat j\u00e4\u00e4nteit\u00e4 planeettojen muodostumisesta 4,5 miljardia vuotta sitten.<\/p>\n

Asteroidivy\u00f6hykkeen toisella puolella sijaitsevat nelj\u00e4 kaasuj\u00e4ttil\u00e4ist\u00e4 \u2013 Jupiter, Saturnus, Uranus ja Neptunus. N\u00e4m\u00e4 planeetat ovat paljon Maata suurempia, mutta kokonsa suhteen hyvin kevyit\u00e4. Ne koostuvat p\u00e4\u00e4osin vedyst\u00e4 ja heliumista.<\/p>\n

Viel\u00e4 \u00e4skett\u00e4in kaukaisin tunnettu planeetta oli j\u00e4inen maailma nimelt\u00e4 Pluto. Pluto on kuitenkin kooltaan huomattavasti pienempi kuin Maan Kuu, ja monet t\u00e4htitieteilij\u00e4t katsovat, ett\u00e4 se on liian pieni ollakseen todellinen planeetta.<\/p>\n

Vuonna 2005 l\u00f6ydettiin aivan kaukaa Auringosta Eris-niminen kappale, joka on v\u00e4hint\u00e4\u00e4n yht\u00e4 suuri kuin Pluto. Viime vuosina Pluton takaa on l\u00f6ydetty yli 1 000 Erisin kaltaista j\u00e4\u00e4maailmaa. Niit\u00e4 kutsutaan Kuiperin vy\u00f6hykkeen kappaleiksi. Vuonna 2006 Kansainv\u00e4linen t\u00e4htitieteellinen liitto p\u00e4\u00e4tti, ett\u00e4 Pluto ja Eris on luokiteltava \u201ck\u00e4\u00e4pi\u00f6planeetoiksi\u201d.<\/p>\n

Viel\u00e4 kauempana sijaitsevat Oortin pilven komeetat. Ne ovat niin kaukana, etteiv\u00e4t ne n\u00e4y edes suurimmilla kaukoputkilla. Ajoittain jokin n\u00e4ist\u00e4 komeetoista irtoaa paikaltaan ja suuntaa kohti Aurinkoa. Silloin se tulee n\u00e4kyviin y\u00f6taivaalla.<\/p>","protected":false},"excerpt":{"rendered":"

The Solar System is made up of the Sun and all of the smaller objects that move around it. Apart from the Sun, the largest members of the Solar System […]<\/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\/2014\/08\/explore_our_universe_poster\/17899681-2-eng-GB\/Explore_our_Universe_poster.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\/2014\/08\/Explore_our_Universe_poster","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-580","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\/580","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=580"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/580\/revisions"}],"predecessor-version":[{"id":1723,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/580\/revisions\/1723"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=580"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=580"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=580"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=580"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=580"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=580"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=580"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}