{"id":272,"date":"2013-12-10T20:44:31","date_gmt":"2013-12-10T20:44:31","guid":{"rendered":"http:\/\/www.123fakta.com\/da\/?p=272"},"modified":"2026-03-19T10:38:54","modified_gmt":"2026-03-19T10:38:54","slug":"vart-solsystems-bildning-och-struktur","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/se\/the-formation-and-structure-of-our-solar-system","title":{"rendered":"V\u00e5rt solsystems bildning och struktur"},"content":{"rendered":"<h2>Bildandet av solsystemet<\/h2>\n<p>Den mest erk\u00e4nda teorin bakom bildandet av solsystemet bland astronomer \u00e4r den s\u00e5 kallade nebulosateorin, som f\u00f6rklarar bildandet av solsystemet p\u00e5 f\u00f6ljande s\u00e4tt:<\/p>\n<ol>\n<li><strong>Nebula:<\/strong>\u00a0Ett stort roterande moln av gas och stoft, k\u00e4nt som \"solnebulosan\", uppst\u00e5r (ca 4,5 miljarder \u00e5r sedan)<\/li>\n<li><strong>Plattans form:<\/strong>\u00a0N\u00e4r den stora nebulosan kollapsar p\u00e5 grund av sin gravitation roterar den snabbare och snabbare, vilket resulterar i att den f\u00e5r en platt \"tefatform\"<\/li>\n<li><strong>Solens bildning:<\/strong>\u00a0Det mesta av materialet i molnet dras mot centrum och bildar solen<\/li>\n<li><strong>Bildandet av planetesimaler:<\/strong>\u00a0Andra partiklar kolliderar (inuti \"tefatet\") och s\u00e4tts samman till s\u00e5 kallade \"planetesimaler\", som \u00e4r f\u00f6rem\u00e5l med en diameter p\u00e5 upp till ca 1 km<\/li>\n<li><strong>Bildandet av planeter, m\u00e5nar, etc:<\/strong>\u00a0Vissa av dessa planetesimaler blir senare asteroider, kometer, m\u00e5nar och planeter<\/li>\n<li><strong>Inre planeter:<\/strong>\u00a0Planeterna i det inre solsystemet f\u00e5r sina karakteristiska stenytor eftersom solvindarna \u00e4r s\u00e5 starka att de bl\u00e5ser bort de flesta l\u00e4ttare grund\u00e4mnen (som v\u00e4te och helium) och bara l\u00e4mnar kvar de sm\u00e5 stenplaneterna<\/li>\n<li><strong>Yttre planeter:<\/strong>\u00a0Solvindarna f\u00f6rlorar sin kraft n\u00e4r de r\u00f6r sig ut i solsystemet och l\u00e4mnar v\u00e4xterna i det yttre solsystemet som gasj\u00e4ttar som huvudsakligen best\u00e5r av v\u00e4te och helium<\/li>\n<\/ol>\n<figure id=\"attachment_7944\" aria-describedby=\"caption-attachment-7944\" style=\"width: 1270px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7944\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system.jpg\" alt=\"V\u00e5rt solsystem\" width=\"1280\" height=\"664\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system.jpg 1280w, https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system-300x156.jpg 300w, https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system-1024x531.jpg 1024w, https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system-768x398.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/our-solar-system-18x9.jpg 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><figcaption id=\"caption-attachment-7944\" class=\"wp-caption-text\">Internationella astronomiska unionen\/Martin Kornmesser<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: Detta \u00e4r v\u00e5rt solsystem<\/strong><\/em><\/p>\n<h2>Solsystemets struktur<\/h2>\n<p>H\u00e4r diskuteras de enskilda delarna av solsystemets struktur. Solsystemets struktur kan snabbt beskrivas p\u00e5 f\u00f6ljande s\u00e4tt:<\/p>\n<p><strong>Sol - Merkurius - Venus - Jorden - Mars<\/strong>\u00a0(asteroidb\u00e4lte)\u00a0<strong>- Jupiter - Saturnus - Uranus - Neptunus<\/strong>\u00a0(Kuiperb\u00e4ltet inkl. Pluto) - (Oorts moln) - (heliosf\u00e4ren)<\/p>\n<p>De enskilda delarna diskuteras mer i detalj nedan:<\/p>\n<ul>\n<li><strong>Planeterna i solsystemet:<\/strong>\u00a0V\u00e5rt solsystem best\u00e5r av 8 planeter (Merkurius, Venus, Jorden, Mars, Jupiter, Saturnus, Uranus, Neptunus) och 5 dv\u00e4rgplaneter (Ceres, Makemake, Haumea, Eris, Pluto) samt tusentals asteroider och kometer<\/li>\n<\/ul>\n<ul>\n<li><strong>Asteroider:<\/strong>\u00a0De flesta asteroider i v\u00e5rt solsystem befinner sig mellan planeterna Mars och Jupiters omloppsbanor och kallas helt enkelt f\u00f6r \"asteroidb\u00e4ltet\".\n<ul>\n<li>Experter uppskattar att asteroidb\u00e4ltet mellan Mars och Jupiter inneh\u00e5ller mer \u00e4n 750 000 asteroider med en diameter p\u00e5 1 km eller mer, samt miljontals mindre asteroider och meteoriter (stenar)<\/li>\n<li>Vissa av asteroiderna har banor som g\u00f6r att de ibland kan kollidera med jorden eller andra planeter i det inre solsystemet<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Comets:<\/strong>\u00a0Majoriteten av kometerna i solsystemet befinner sig l\u00e4ngre bort fr\u00e5n jorden \u00e4n Pluto och \u00e5terfinns i Kuiperb\u00e4ltet och Oorts moln\n<ul>\n<li>Kometer i solsystemet best\u00e5r huvudsakligen av is och sten. N\u00e4r en komet n\u00e4rmar sig solen sm\u00e4lter en del av isen i dess k\u00e4rna och f\u00f6rvandlas till gas, och det \u00e4r denna gas som utg\u00f6r kometernas karakteristiska \"svansar\"<\/li>\n<li>Kometer delas in i kortlivade och l\u00e5nglivade kometer; kortlivade kometer fullbordar sina banor p\u00e5 mindre \u00e4n 200 \u00e5r och tros h\u00e4rstamma fr\u00e5n Kuiperb\u00e4ltet, medan l\u00e5nglivade kometer fullbordar sina banor p\u00e5 \u00f6ver 200 \u00e5r och troligen kommer fr\u00e5n Oorts moln<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Det inre solsystemet:<\/strong>\u00a0De fyra planeterna n\u00e4rmast solen - Merkurius, Venus, Jorden och Mars - \u00e4r s\u00e5 kallade \"stenplaneter\" (\u00e4ven kallade bergsplaneter, jordplaneter eller terrestra planeter) eftersom de alla har fasta stenytor. Dessa planeter kallas ocks\u00e5 f\u00f6r det \"inre solsystemet\".<\/li>\n<\/ul>\n<ul>\n<li><strong>Yttre solsystemet:<\/strong>\u00a0De 4 st\u00f6rsta planeterna som befinner sig l\u00e4ngre fr\u00e5n solen \u00e4n Mars - dvs Jupiter, Saturnus, Uranus och Neptunus - \u00e4r s\u00e5 kallade \"gasj\u00e4ttar\" (\u00e4ven kallade gasplaneter eller jovianska planeter) eftersom de inte har en fast yta utan i st\u00e4llet huvudsakligen best\u00e5r av gas. Dessa planeter kallas ocks\u00e5 f\u00f6r det \"yttre solsystemet\".\n<ul>\n<li>Planeterna i det yttre solsystemet best\u00e5r huvudsakligen av v\u00e4te och helium, vilket g\u00f6r att deras sammans\u00e4ttning \u00e4r mycket lik solens. Vissa forskare tror att planeterna kan ha fasta k\u00e4rnor. Dessutom har de ringar som inneh\u00e5ller stoft, sten och is. Dessa element varierar kraftigt i storlek; fr\u00e5n dammkorn till block stora som ett hus<\/li>\n<li>Saturnus har de st\u00f6rsta och mest framtr\u00e4dande ringarna bland planeterna i v\u00e5rt solsystem - men \u00e4ven Jupiter, Uranus och Neptunus har ringar<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Magnetiska f\u00e4lt:<\/strong>\u00a0De flesta planeter i v\u00e5rt solsystem har magnetf\u00e4lt som omger dem (en s\u00e5 kallad \"magnetosf\u00e4r\"). Solen har ocks\u00e5 ett magnetf\u00e4lt (heliosf\u00e4ren) som omfattar hela v\u00e5rt solsystem<\/li>\n<\/ul>\n<ul>\n<li><strong>M\u00e5nar:<\/strong>\u00a0N\u00e4stan alla planeter i v\u00e5rt solsystem - och n\u00e5gra av m\u00e5narna - har atmosf\u00e4rer. De kemiska \u00e4mnen som finns i de enskilda atomkulorna varierar dock mycket, och atmosf\u00e4rernas beteende (p\u00e5 grund av skillnader i planeternas banor) \u00e4r ocks\u00e5 varierande. Till exempel kollapsar Plutos atmosf\u00e4r n\u00e4r Pluto kretsar l\u00e5ngt bort fr\u00e5n solen. Atmosf\u00e4ren \u00e5terh\u00e4mtar sig n\u00e4r planeten n\u00e4rmar sig solen. Detta fenomen ses fr\u00e4mst hos kometer\n<ul>\n<li>Det finns 166 k\u00e4nda m\u00e5nar i v\u00e5rt solsystem. Detta antal inkluderar dock endast m\u00e5nar av erk\u00e4nda v\u00e4xter, vilket d\u00e4rf\u00f6r utesluter Plutos m\u00e5nar, till exempel<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Kuiperb\u00e4ltet:<\/strong>\u00a0Kuiperb\u00e4ltet ligger ca 50 AU (50 x jordens avst\u00e5nd fr\u00e5n solen) fr\u00e5n solen - efter Neptunus bana - och str\u00e4cker sig 30-35 AU l\u00e4ngre ut i solsystemet. Kuiperb\u00e4ltet inneh\u00e5ller sannolikt hundratusentals isiga objekt som \u00e4r mer \u00e4n 100 km breda och \u00f6ver 1 biljon kometer (eller mer)<\/li>\n<\/ul>\n<ul>\n<li><strong>Molnet i \u00f6rat:<\/strong>\u00a0Oorts moln befinner sig ca 50.000 AU fr\u00e5n solen och kan teoretiskt str\u00e4cka sig 5.000-100.000 AU ut i solsystemet. Oorts moln inneh\u00e5ller upp till 2 biljoner isiga objekt och ett mycket stort antal kometer. Det b\u00f6r noteras att Oorts moln aldrig har observerats<\/li>\n<li><strong>Heliosf\u00e4ren:<\/strong>\u00a0Efter Oorts moln kommer solsystemets slutpunkt, heliosf\u00e4ren, som \u00e4r solens enorma droppformade magnetf\u00e4lt som omger hela solsystemet och best\u00e5r av elektriskt laddade partiklar. M\u00e5nga astronomer tror att heliosf\u00e4rens avst\u00e5nd till solen \u00e4r cirka 15 miljarder kilometer fr\u00e5n solen<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Solsystemets uppkomst Den mest erk\u00e4nda teorin bakom solsystemets uppkomst bland astronomer \u00e4r den s\u00e5 kallade nebulosateorin, som f\u00f6rklarar solsystemets uppkomst p\u00e5 f\u00f6ljande s\u00e4tt: Nebulosa: Ett stort roterande moln av gas och stoft, k\u00e4nt som \"solnebulosan\", uppst\u00e5r (f\u00f6r ca 4,5 miljarder \u00e5r sedan) Plattan ... <a title=\"V\u00e5rt solsystems bildning och struktur\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/se\/the-formation-and-structure-of-our-solar-system\" aria-label=\"L\u00e4s mer om Solsystemets uppbyggnad och struktur\">L\u00e4s mer<\/a><\/p>","protected":false},"author":1,"featured_media":7943,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[69],"tags":[120],"class_list":["post-272","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-universe","tag-adsense"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The formation and structure of the solar system<\/title>\n<meta name=\"description\" content=\"Our solar system was formed 4.5 billion years ago. 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