{"id":1138,"date":"2004-11-16T10:43:00","date_gmt":"2004-11-16T09:43:00","guid":{"rendered":"https:\/\/kids.esa.int\/asteroid_families\/"},"modified":"2026-10-08T00:36:26","modified_gmt":"2026-10-07T22:36:26","slug":"asteroid_families","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/asteroid_families\/","title":{"rendered":"Asteroidfamiljer"},"content":{"rendered":"
\n

Man vet nu att Ceres har en bredd p\u00e5 cirka 940 km \u2013 ungef\u00e4r en fj\u00e4rdedel av jordens m\u00e5ne. Men den st\u00e5r f\u00f6r mer \u00e4n en fj\u00e4rdedel av den totala massan hos alla asteroider.<\/p>\n<\/div>\n

Ytterligare sexton asteroider har en diameter p\u00e5 mer \u00e4n 240 km. De flesta asteroiderna best\u00e5r dock av stenar och block som bara \u00e4r n\u00e5gra meter i diameter. Om man skulle pressa ihop dem alla till ett enda objekt skulle det \u00e4nd\u00e5 vara mindre \u00e4n m\u00e5nen. Vissa asteroider \u00e4r steniga, andra best\u00e5r av metaller, s\u00e5som j\u00e4rn och nickel. De flesta \u00e4r svartbruna till f\u00e4rgen och rika p\u00e5 kol.<\/p>\n

M\u00e5nga asteroider tillh\u00f6r familjer. Varje familj har samma f\u00e4rg och verkar best\u00e5 av samma material. De r\u00f6r sig dessutom t\u00e4tt tillsammans i olika delar av huvudb\u00e4ltet. En av de st\u00f6rsta av dessa \u00e4r Flora-familjen, som har cirka 400 k\u00e4nda medlemmar.<\/p>\n

Asteroider f\u00f6rekommer \u00e4ven utanf\u00f6r huvudb\u00e4ltet. De har kastats ut fr\u00e5n sin ursprungliga bana av Jupiters starka gravitation eller genom kollisioner med andra asteroider. Vissa har blivit m\u00e5nar till den stora planeten. Hundratusentals asteroider \u2013 varav vissa \u00e4r stora \u2013 passerar n\u00e4ra jorden.<\/p>","protected":false},"excerpt":{"rendered":"

Ceres is now known to have a width of about 940 km – about one quarter (one fourth) the size of Earth’s Moon. But it accounts for more than one […]<\/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\/2002\/04\/typical_orbits_for_inner_solar_system_asteroids2\/17865268-3-eng-GB\/Typical_orbits_for_inner_solar_system_asteroids.jpg","esa_banner_description":"Typical orbits for inner solar system asteroids","esa_banner_credit":"ESA 2002. Illustration by Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/04\/Typical_orbits_for_inner_solar_system_asteroids2","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-1138","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\/sv\/wp-json\/wp\/v2\/posts\/1138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=1138"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/1138\/revisions"}],"predecessor-version":[{"id":2281,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/1138\/revisions\/2281"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=1138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=1138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=1138"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=1138"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=1138"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=1138"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=1138"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=1138"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=1138"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=1138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}