{"id":509,"date":"2004-11-16T10:36:00","date_gmt":"2004-11-16T09:36:00","guid":{"rendered":"https:\/\/kids.esa.int\/asteroids_the_minor_planets\/"},"modified":"2026-10-08T00:29:02","modified_gmt":"2026-10-07T22:29:02","slug":"asteroids_the_minor_planets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/asteroids_the_minor_planets\/","title":{"rendered":"Asteroider \u2013 sm\u00e5planetene"},"content":{"rendered":"<div class=\"lede\">\n<p>Asteroider er sm\u00e5, steinete himmellegemer som er rester fra planetdannelsen for 4,5 milliarder \u00e5r siden. De kalles ofte \u2018sm\u00e5planeter\u2019.<\/p>\n<\/div>\n<p>Man antar at det finnes milliarder av disse steinblokkene. De fleste av dem befinner seg i et donutformet \u2018hovedbelte\u2019 mellom Mars\u2019 og Jupiters baner. P\u00e5 den indre kanten av dette hovedbeltet tar det omtrent tre \u00e5r for asteroidene \u00e5 fullf\u00f8re en oml\u00f8psbane rundt Solen. De som befinner seg n\u00e6r den ytre grensen av hovedbeltet, bruker dobbelt s\u00e5 lang tid.<\/p>\n<p>Ordet \u2018asteroide\u2019 betyr \u2018stjernelignende\u2019. De fikk dette navnet fordi de i de fleste teleskoper kun kan ses som lyspunkter. P\u00e5 begynnelsen av 1900-tallet kalte astronomene dem \u2018himmelens skadedyr\u2019. De var synlige i s\u00e5 store mengder at de \u00f8dela fotografier av fjerne galakser og t\u00e5ker.<\/p>\n<p>Den st\u00f8rste av asteroiderne, Ceres, var den f\u00f8rste som ble oppdaget. Den ble oppdaget av Giuseppi Piazzi fra Palermo p\u00e5 Sicilia den 1. januar 1801.<\/p>\n<p>En annen sm\u00e5planet \u2013 Pallas \u2013 ble oppdaget av Wilhelm Olbers i 1802. Deretter fulgte Juno (1804) og Vesta (1807). Siden 1847 har det ikke g\u00e5tt et \u00e5r uten at minst \u00e9n asteroide er blitt oppdaget.<\/p>\n<nav class=\"related\" aria-label=\"Relatert\">\n<h2 class=\"related__heading\">Relatert<\/h2>\n<div class=\"grid related__grid\">\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/nb\/asteroider_de_smaa_planeter\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Dansk<\/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=\"\/nb\/planetoiden_-_de_kleine_planeten\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">nederlandsk<\/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=\"\/nb\/asteroiden_-_die_kleinplaneten\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Tysk<\/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=\"\/nb\/asteroider_de_smaa_planetene\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Norsk<\/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=\"\/nb\/asteroidy_czyli_planetoidy\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">polsk<\/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=\"\/nb\/asteroider_smaaplaneterna\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Svensk<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<\/div>\n<\/nav>","protected":false},"excerpt":{"rendered":"<p>Asteroids are small, rocky bodies that have been left over from the formation of the planets 4.5 billion years ago. They are often known as &#8216;minor planets&#8217;. There are thought [&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\/2001\/07\/asteroid_243_ida_and_its_newly_discovered_moon_dactyl2\/17863270-3-eng-GB\/Asteroid_243_Ida_and_its_newly_discovered_moon_Dactyl.jpg","esa_banner_description":"Asteroid 243 Ida and its newly discovered moon, Dactyl","esa_banner_credit":"NASA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2001\/07\/Asteroid_243_Ida_and_its_newly_discovered_moon_Dactyl2","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-509","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\/nb\/wp-json\/wp\/v2\/posts\/509","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=509"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/509\/revisions"}],"predecessor-version":[{"id":1652,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/509\/revisions\/1652"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=509"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=509"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=509"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=509"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=509"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=509"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=509"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}