{"id":1101,"date":"2005-12-09T13:07:00","date_gmt":"2005-12-09T12:07:00","guid":{"rendered":"https:\/\/kids.esa.int\/moons_and_rings\/"},"modified":"2026-10-08T00:36:01","modified_gmt":"2026-10-07T22:36:01","slug":"moons_and_rings","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/moons_and_rings\/","title":{"rendered":"M\u00e5ner og ringe"},"content":{"rendered":"
\n

Alle planeterne kredser om Solen mod uret \u2013 set ovenfra fra Jordens nordpol. Deres \u00e5r \u2013 den tid, det tager dem at fuldf\u00f8re en oml\u00f8bsbane \u2013 varierer afh\u00e6ngigt af deres afstand til Solen. Et \u00e5r p\u00e5 Merkur varer kun 88 jorddage, s\u00e5 en person, der er f\u00f8dt der, ville have fire gange s\u00e5 mange f\u00f8dselsdage som os her p\u00e5 Jorden. Til geng\u00e6ld svarer et \u00e5r p\u00e5 Pluto til 248 af vores \u00e5r. En person, der er f\u00f8dt p\u00e5 Pluto, ville aldrig fejre en f\u00f8dselsdag!<\/p>\n<\/div>\n

Venus og Merkur har ingen naturlige m\u00e5ner, men de \u00f8vrige syv planeter har alle m\u00e5ner, der kredser om dem. Det samlede antal, der hidtil er registreret, er 138. De fleste af m\u00e5nerne er meget sm\u00e5 og sv\u00e6re at se, selv med store teleskoper. I \u00f8jeblikket er Jupiter rekordindehaver med 63 kendte m\u00e5ner. Blandt disse er der fire m\u00e5ner p\u00e5 st\u00f8rrelse med planeter \u2013 Ganymedes (den st\u00f8rste m\u00e5ne i solsystemet), Callisto, Europa og Io.<\/p>\n

De andre gasgiganter har med deres st\u00e6rke tyngdekraft ogs\u00e5 tiltrukket et stort antal m\u00e5ner: Saturn har 31, Uranus 27 og Neptun 13. B\u00e5de Jorden og Pluto har \u00e9n stor m\u00e5ne i kredsl\u00f8b om sig.<\/p>\n

De fire st\u00f8rste planeter \u2013 Jupiter, Saturn, Uranus og Neptun \u2013 har ogs\u00e5 ringe. De best\u00e5r af is- og stenstykker, der varierer i st\u00f8rrelse fra bjerge til cigaretr\u00f8g. Ringene kan v\u00e6re rester fra en m\u00e5ne, der gik i stykker, eller stykker, der er br\u00e6kket af n\u00e6rliggende m\u00e5ner.<\/p>","protected":false},"excerpt":{"rendered":"

All of the planets travel around the Sun in a counter-clockwise direction \u2013 as seen from above Earth\u2019s north pole. Their year – the time they take to complete 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\/2005\/04\/jupiter_s_moon_europa2\/17905460-2-eng-GB\/Jupiter_s_moon_Europa.jpg","esa_banner_description":"Jupiter's moon, Europa","esa_banner_credit":"NASA\/DLR","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/04\/Jupiter_s_moon_Europa2","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":[10,11,12],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1101","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1101","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=1101"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1101\/revisions"}],"predecessor-version":[{"id":2244,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1101\/revisions\/2244"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=1101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=1101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=1101"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=1101"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=1101"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=1101"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=1101"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=1101"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=1101"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=1101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}