{"id":183,"date":"2021-12-02T12:49:55","date_gmt":"2021-12-02T11:49:55","guid":{"rendered":"https:\/\/kids.esa.int\/shooting_stars2\/"},"modified":"2026-10-08T00:25:13","modified_gmt":"2026-10-07T22:25:13","slug":"shooting_stars2","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/shooting_stars2\/","title":{"rendered":"T\u00e4htienlentoja"},"content":{"rendered":"<div class=\"lede\">\n<p>On olemassa useita satoja komeettoja, jotka viett\u00e4v\u00e4t suurimman osan elinkaarestaan aurinkokunnan sis\u00e4osan planeettojen joukossa. N\u00e4m\u00e4 komeetat j\u00e4tt\u00e4v\u00e4t j\u00e4lkeens\u00e4 lukuisia kaasu- ja p\u00f6lyj\u00e4lki\u00e4.<\/p>\n<\/div>\n<p>Hiekanjyvien kokoiset p\u00f6lyhiukkaset t\u00f6rm\u00e4\u00e4v\u00e4t toisinaan Maata ymp\u00e4r\u00f6iv\u00e4\u00e4n ohueen ilmakeh\u00e4\u00e4n, jossa ne kuumenevat eritt\u00e4in nopeasti. Kun p\u00f6lyhiukkaset palavat loppuun, ne j\u00e4tt\u00e4v\u00e4t kirkkaita valojuovia y\u00f6taivaalle. N\u00e4it\u00e4 juovia kutsutaan meteoreiksi, ja niit\u00e4 kutsutaan usein lempinimill\u00e4 \u2018t\u00e4hdenlento\u2019 tai \u2018putoava t\u00e4hti\u2019.<\/p>\n<p>Selke\u00e4n\u00e4 y\u00f6n\u00e4, jos tuijottaa taivasta tarpeeksi kauan, voi n\u00e4hd\u00e4 yhden t\u00e4llaisista meteoreista eli t\u00e4hdenlennosta. Tiettyin\u00e4 aikoina vuodesta Maa kulkee komeetan j\u00e4tt\u00e4m\u00e4n j\u00e4ljen l\u00e4pi. T\u00e4ll\u00f6in t\u00e4hdenlentojen m\u00e4\u00e4r\u00e4 kasvaa jopa sataan tunnissa. T\u00e4t\u00e4 kutsutaan \u2018meteorisateeksi\u2019.<\/p>\n<p>Harvinaisissa tapauksissa meteoriparvet ovat tunnetusti valaisseet koko taivaan. Vuoden 1966 Leonidien meteoriparven n\u00e4hneet ihmiset olivat h\u00e4mm\u00e4styneit\u00e4 n\u00e4hdess\u00e4\u00e4n 40 t\u00e4hdenlentoa sekunnissa!<\/p>\n<nav class=\"related\" aria-label=\"Aiheeseen liittyv\u00e4t\">\n<h2 class=\"related__heading\">Aiheeseen liittyv\u00e4t<\/h2>\n<div class=\"grid related__grid\">\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/stjerneskud\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Tanska<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/vallende_sterren\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">hollanti<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/sternschnuppen\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">saksa<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/stjerneskudd\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">norja<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/spadajace_gwiazdy\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">puola<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/fallande_stjaernor\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">ruotsi<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<\/div>\n<\/nav>","protected":false},"excerpt":{"rendered":"<p>There are several hundred comets that spend most of their lives among the planets of the inner Solar System. These comets leave many trails of gas and dust behind them. [&hellip;]<\/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\/2003\/04\/different_views_of_a_leonid_fireball_in_19662\/17881733-2-eng-GB\/Different_views_of_a_Leonid_fireball_in_1966.jpg","esa_banner_description":"Different views of a Leonid fireball in 1966","esa_banner_credit":"New Mexico State University Observatory, A. Scott Murrell","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Different_views_of_a_Leonid_fireball_in_19662","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-183","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\/183","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=183"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/183\/revisions"}],"predecessor-version":[{"id":1326,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/183\/revisions\/1326"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=183"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=183"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=183"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=183"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=183"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=183"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=183"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}