{"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\/da\/asteroids_the_minor_planets\/","title":{"rendered":"Asteroider \u2013 de sm\u00e5 planeter"},"content":{"rendered":"<div class=\"lede\">\n<p>Asteroider er sm\u00e5, stenede himmellegemer, der er tilbage fra planeternes dannelse for 4,5 milliarder \u00e5r siden. De kaldes ofte for \u2018sm\u00e5planeter\u2019.<\/p>\n<\/div>\n<p>Man ansl\u00e5r, at der findes milliarder af disse klippestykker. De fleste af dem befinder sig i et donutformet \u2018hovedb\u00e6lte\u2019 mellem Mars\u2019 og Jupiters baner. P\u00e5 den indre kant af dette hovedb\u00e6lte tager det asteroiderne cirka tre \u00e5r at kredse om Solen. For dem, der befinder sig t\u00e6t p\u00e5 hovedb\u00e6ltets ydre gr\u00e6nse, tager det dobbelt s\u00e5 lang tid.<\/p>\n<p>Ordet \u2018asteroide\u2019 betyder \u2018stjernelignende\u2019. De fik dette navn, fordi de i de fleste teleskoper kun kan ses som lyspunkter. I begyndelsen af det 20. \u00e5rhundrede kaldte astronomerne dem for \u2018himlens skadedyr\u2019. De var synlige i s\u00e5 stort antal, at de \u00f8delagde fotografier af fjerne galakser og t\u00e5ger.<\/p>\n<p>Den st\u00f8rste af asteroiderne, Ceres, var den f\u00f8rste, der blev opdaget. Den blev opdaget af Giuseppi Piazzi fra Palermo p\u00e5 Sicilien den 1. januar 1801.<\/p>\n<p>En anden lille planet \u2013 Pallas \u2013 blev opdaget af Wilhelm Olbers i 1802. Herefter fulgte Juno (1804) og Vesta (1807). Siden 1847 er der ikke g\u00e5et et eneste \u00e5r uden, at der er blevet opdaget mindst \u00e9n asteroide.<\/p>\n<nav class=\"related\" aria-label=\"Relateret\">\n<h2 class=\"related__heading\">Relateret<\/h2>\n<div class=\"grid related__grid\">\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/da\/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=\"\/da\/planetoiden_-_de_kleine_planeten\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">hollandsk<\/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=\"\/da\/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=\"\/da\/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=\"\/da\/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=\"\/da\/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\/da\/wp-json\/wp\/v2\/posts\/509","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=509"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/509\/revisions"}],"predecessor-version":[{"id":1652,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/509\/revisions\/1652"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=509"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=509"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=509"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=509"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=509"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=509"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=509"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}