{"id":923,"date":"2004-11-16T10:04:00","date_gmt":"2004-11-16T09:04:00","guid":{"rendered":"https:\/\/kids.esa.int\/exploring_asteroids\/"},"modified":"2026-10-08T00:33:49","modified_gmt":"2026-10-07T22:33:49","slug":"exploring_asteroids","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/exploring_asteroids\/","title":{"rendered":"Utforskning av asteroider"},"content":{"rendered":"
\n

De flesta asteroider \u00e4r s\u00e5 sm\u00e5 och ligger s\u00e5 l\u00e5ngt bort att vi bara kan se dem som sm\u00e5 ljuspunkter. De uppt\u00e4cks genom att de r\u00f6r sig framf\u00f6r natt himlens \u2018fasta stj\u00e4rnor\u2019. Vi l\u00e4r oss mer om dem genom att anv\u00e4nda stora teleskop f\u00f6r att studera det ljus de reflekterar.<\/p>\n<\/div>\n

Men inte ens rymdteleskopet Hubble kan avsl\u00f6ja s\u00e4rskilt mycket om dem. En av de mest intressanta asteroiderna \u00e4r den metallrika Vesta. Hubbles bilder visar en ganska rund himlakropp med en stor nedslagskrater.<\/p>\n

Vissa asteroider som passerar n\u00e4ra jorden har unders\u00f6kts med hj\u00e4lp av radar. Radarekon registreras av stora radioteleskop och anv\u00e4nds f\u00f6r att fastst\u00e4lla deras form och storlek.<\/p>\n

Ett f\u00e5tal asteroider har unders\u00f6kts mer ing\u00e5ende av rymdfarkoster som bes\u00f6kt dem. Bilderna visar objekt med m\u00e5nga kratrar, vilket tyder p\u00e5 att de har utsatts f\u00f6r kollisioner under miljarder \u00e5r. \u00c5r 2000 blev NEAR Shoemaker den f\u00f6rsta rymdsonden som gick in i omloppsbana runt en asteroid. Rymdsonden avslutade sin livstid med en historisk landning p\u00e5 Eros, en av de st\u00f6rsta asteroiderna n\u00e4ra jorden.<\/p>\n

ESA:s rymdsond Rosetta har dessutom flugit f\u00f6rbi tv\u00e5 asteroider i huvudb\u00e4ltet \u2013 Steins och Lutetia \u2013 p\u00e5 sin v\u00e4g mot en komet. Lutetia, med en diameter p\u00e5 cirka 130 km, var den st\u00f6rsta asteroid som hittills bes\u00f6kts av en rymdsond. ESA unders\u00f6ker ocks\u00e5 olika s\u00e4tt att avleda en asteroid som \u00e4r p\u00e5 v\u00e4g mot jorden.<\/p>","protected":false},"excerpt":{"rendered":"

Most asteroids are so small and so far away that we can only see them as tiny points of light. They are found through their movement in front of the […]<\/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\/asteroids_come_in_many_shapes_and_sizes2\/17886580-2-eng-GB\/Asteroids_come_in_many_shapes_and_sizes.jpg","esa_banner_description":"Asteroids come in many shapes and sizes","esa_banner_credit":"courtesy Observatoire de Paris","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Asteroids_come_in_many_shapes_and_sizes2","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-923","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\/923","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=923"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/923\/revisions"}],"predecessor-version":[{"id":2066,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/923\/revisions\/2066"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=923"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=923"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=923"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=923"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=923"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=923"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=923"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}