{"id":194,"date":"2021-12-02T12:44:57","date_gmt":"2021-12-02T11:44:57","guid":{"rendered":"https:\/\/kids.esa.int\/meteors2\/"},"modified":"2026-10-08T00:25:20","modified_gmt":"2026-10-07T22:25:20","slug":"meteors2","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/meteors2\/","title":{"rendered":"Meteorit"},"content":{"rendered":"
\n

Aurinkokunta on t\u00e4ynn\u00e4 planeettojen muodostumisen j\u00e4ljilt\u00e4 j\u00e4\u00e4nytt\u00e4 ainetta. Avaruudessa liikkuvia pieni\u00e4 kivenpalasia kutsutaan meteoroideiksi. Jos ne tunkeutuvat planeetan ilmakeh\u00e4\u00e4n ja palavat siell\u00e4, niit\u00e4 pidet\u00e4\u00e4n meteoreina. Joskus suuremmat kivenpalaset s\u00e4ilyv\u00e4t riitt\u00e4v\u00e4n kauan, jotta ne t\u00f6rm\u00e4\u00e4v\u00e4t planeetan pintaan. Maan pinnalla olevia avaruuskivi\u00e4 kutsutaan meteoriiteiksi.<\/p>\n<\/div>\n

Meteorit (joita kutsutaan usein \u201ct\u00e4hdenlennoksi\u201d) ovat hyvin yleinen ilmi\u00f6. Jokainen, joka tuijottaa kirkasta y\u00f6taivasta, n\u00e4kee lopulta n\u00e4it\u00e4 lyhyit\u00e4 valojuovia. Meteorit syntyv\u00e4t, kun meteoriitit tunkeutuvat yl\u00e4ilmakeh\u00e4\u00e4n noin 15 km\/s:n nopeudella! Meteoriittien valojuovat kest\u00e4v\u00e4t yleens\u00e4 alle sekunnin. Kitka ohuessa ilmassa noin 100 km:n korkeudessa saa meteoriitit hehkumaan, kun ne kuumenevat ja tuhoutuvat.<\/p>\n

Meteoreja voi n\u00e4hd\u00e4 milloin tahansa, mutta paras aika niiden havainnointiin on s\u00e4\u00e4nn\u00f6llisesti toistuvien meteorisateiden aikana. T\u00e4llaiset meteorisateet esiintyv\u00e4t vuosittain suunnilleen samoina p\u00e4ivin\u00e4, kun Maa kulkee ohikulkevan komeetan j\u00e4tt\u00e4m\u00e4n p\u00f6lyvirran l\u00e4pi.<\/p>\n

P\u00e4\u00e4suihkuja on noin 20, vaikka vain harvat niist\u00e4 tuottavat jopa 50 meteoria minuutissa. Toisinaan taivas t\u00e4yttyy t\u00e4hdenlennosta. Tunnetuimmat \u201cmeteorimyrskyt\u201d liittyv\u00e4t Leonidien meteorimyrskyyn, joka tapahtuu vuosittain 14.\u201320. marraskuuta. Myrsky on ollut aiemmin niin voimakas, ett\u00e4 se on muistuttanut lumisadetta!<\/p>\n

Jotkut meteorit ovat liian himmeit\u00e4 n\u00e4ky\u00e4kseen edes y\u00f6ll\u00e4, mutta ne voidaan havaita tutkalla. My\u00f6s muilla planeetoilla esiintyy meteoriparvia. Marsissa meteoriitit palavat yleens\u00e4 ohuessa ilmakeh\u00e4ss\u00e4 ja muodostavat meteoreja. Kuussa ei kuitenkaan ole ilmaa, joten meteoriitit osuvat maahan ja r\u00e4j\u00e4ht\u00e4v\u00e4t palamatta loppuun.<\/p>","protected":false},"excerpt":{"rendered":"

The Solar System is full of material left over from the formation of the planets. Small chunks of rock that travel through space are known as meteoroids. If they enter […]<\/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\/2013\/07\/meteor_shower\/17904232-2-eng-GB\/Meteor_shower.jpg","esa_banner_description":"Meteor shower","esa_banner_credit":"Night Sky Nation","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2013\/07\/Meteor_shower","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":[46,10,11],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-194","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/194","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=194"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/194\/revisions"}],"predecessor-version":[{"id":1337,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/194\/revisions\/1337"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=194"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=194"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=194"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=194"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=194"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=194"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=194"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}