{"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":"aurinkokuntamme-muodostuminen-ja-rakenne","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/fi\/the-formation-and-structure-of-our-solar-system","title":{"rendered":"Aurinkokuntamme muodostuminen ja rakenne"},"content":{"rendered":"<h2>Aurinkokunnan muodostuminen<\/h2>\n<p>T\u00e4htitieteilij\u00f6iden tunnetuin teoria aurinkokunnan muodostumisen taustalla on niin sanottu t\u00e4htisumuteoria, joka selitt\u00e4\u00e4 aurinkokunnan muodostumisen seuraavasti:<\/p>\n<ol>\n<li><strong>Nebula:<\/strong>\u00a0Syntyy suuri py\u00f6riv\u00e4 kaasu- ja p\u00f6lypilvi, joka tunnetaan nimell\u00e4 \"Auringon t\u00e4htisumu\" (noin 4,5 miljardia vuotta sitten).<\/li>\n<li><strong>Levyn muoto:<\/strong>\u00a0Kun suuri t\u00e4htisumu painovoiman vaikutuksesta romahtaa, se py\u00f6rii yh\u00e4 nopeammin ja nopeammin, jolloin se saa litte\u00e4n lautasen muodon.<\/li>\n<li><strong>Auringon muodostuminen:<\/strong>\u00a0Suurin osa pilven aineesta vedet\u00e4\u00e4n kohti keskustaa ja muodostaa auringon.<\/li>\n<li><strong>Planetesimaalien muodostuminen:<\/strong>\u00a0Muut hiukkaset t\u00f6rm\u00e4\u00e4v\u00e4t toisiinsa (lautasen sis\u00e4ll\u00e4) ja kootaan siten niin sanotuiksi planetesimaaleiksi, jotka ovat halkaisijaltaan enint\u00e4\u00e4n noin 1 km:n kokoisia kohteita.<\/li>\n<li><strong>Planeettojen, kuiden jne. muodostuminen:<\/strong>\u00a0Joistakin n\u00e4ist\u00e4 planetesimaaleista tulee my\u00f6hemmin asteroideja, komeettoja, kuita ja planeettoja.<\/li>\n<li><strong>Sis\u00e4iset planeetat:<\/strong>\u00a0Sis\u00e4isen aurinkokunnan planeetat saavat niille ominaisen kivipinnan, koska aurinkotuulet ovat niin voimakkaita, ett\u00e4 ne puhaltavat pois suurimman osan kevyemmist\u00e4 alkuaineista (kuten vedyn ja heliumin), jolloin j\u00e4ljelle j\u00e4\u00e4v\u00e4t vain pienet kiviplaneetat.<\/li>\n<li><strong>Ulkoplaneetat:<\/strong>\u00a0Aurinkotuulet menett\u00e4v\u00e4t tehoaan siirtyess\u00e4\u00e4n ulos aurinkokuntaan, jolloin kasvit j\u00e4\u00e4v\u00e4t ulommassa aurinkokunnassa kaasuj\u00e4ttil\u00e4isiksi, jotka koostuvat p\u00e4\u00e4asiassa vedyst\u00e4 ja heliumista.<\/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=\"Aurinkokuntamme\" 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\">Kansainv\u00e4linen t\u00e4htitieteellinen liitto\/Martin Kornmesser<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: T\u00e4m\u00e4 on aurinkokuntamme<\/strong><\/em><\/p>\n<h2>Aurinkokunnan rakenne<\/h2>\n<p>T\u00e4ss\u00e4 k\u00e4sitell\u00e4\u00e4n aurinkokunnan rakenteen yksitt\u00e4isi\u00e4 osia. Aurinkokunnan rakenne voidaan hahmotella nopeasti seuraavasti:<\/p>\n<p><strong>Aurinko - Merkurius - Venus - Maa - Mars<\/strong>\u00a0(asteroidivy\u00f6hyke)\u00a0<strong>- Jupiter - Saturnus - Uranus - Neptunus -<\/strong>\u00a0(Kuiperin vy\u00f6, mukaan lukien Pluto) - (Oortin pilvi) - (heliosf\u00e4\u00e4ri)<\/p>\n<p>Yksitt\u00e4isi\u00e4 osatekij\u00f6it\u00e4 k\u00e4sitell\u00e4\u00e4n yksityiskohtaisemmin j\u00e4ljemp\u00e4n\u00e4:<\/p>\n<ul>\n<li><strong>Aurinkokunnan planeetat:<\/strong>\u00a0Aurinkokuntaamme kuuluu 8 planeettaa (Merkurius, Venus, Maa, Mars, Jupiter, Saturnus, Uranus, Neptunus) ja 5 k\u00e4\u00e4pi\u00f6planeettaa (Ceres, Makemake, Haumea, Eris, Pluto) sek\u00e4 tuhansia asteroideja ja komeettoja.<\/li>\n<\/ul>\n<ul>\n<li><strong>Asteroidit:<\/strong>\u00a0Suurin osa aurinkokuntamme asteroideista sijaitsee Mars-planeetan ja Jupiterin kiertoradan v\u00e4liss\u00e4, ja niit\u00e4 kutsutaan yksinkertaisesti \"asteroidivy\u00f6hykkeeksi\".\n<ul>\n<li>Asiantuntijat arvioivat, ett\u00e4 Marsin ja Jupiterin v\u00e4lisell\u00e4 asteroidivy\u00f6hykkeell\u00e4 on yli 750 000 halkaisijaltaan v\u00e4hint\u00e4\u00e4n 1 km:n asteroidia sek\u00e4 miljoonia pienempi\u00e4 asteroideja ja meteoriitteja (kivi\u00e4).<\/li>\n<li>Joidenkin asteroidien kiertoradat aiheuttavat toisinaan t\u00f6rm\u00e4yksi\u00e4 Maan tai muiden aurinkokunnan sis\u00e4isten planeettojen kanssa.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Komeetat:<\/strong>\u00a0Suurin osa aurinkokunnan komeetoista on kauempana Maasta kuin Pluto, ja ne sijaitsevat Kuiperin vy\u00f6hykkeell\u00e4 ja Oortin pilvess\u00e4.\n<ul>\n<li>Aurinkokunnan komeetat koostuvat p\u00e4\u00e4asiassa j\u00e4\u00e4st\u00e4 ja kivest\u00e4. Kun komeetta l\u00e4hestyy Aurinkoa, osa sen ytimess\u00e4 olevasta j\u00e4\u00e4st\u00e4 sulaa ja muuttuu kaasuksi, ja juuri t\u00e4m\u00e4 kaasu muodostaa komeettojen tyypilliset \"pyrst\u00f6t\".<\/li>\n<li>Lyhytik\u00e4iset komeetat t\u00e4ydent\u00e4v\u00e4t kiertoratansa alle 200 vuodessa ja niiden uskotaan olevan per\u00e4isin Kuiperin vy\u00f6hykkeelt\u00e4, kun taas pitk\u00e4ik\u00e4iset komeetat t\u00e4ydent\u00e4v\u00e4t kiertoratansa yli 200 vuodessa ja ovat todenn\u00e4k\u00f6isesti per\u00e4isin Oortin pilvest\u00e4.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Sisempi aurinkokunta:<\/strong>\u00a0Nelj\u00e4 Aurinkoa l\u00e4himp\u00e4n\u00e4 olevaa planeettaa - Merkurius, Venus, Maa ja Mars - ovat niin sanottuja \"kallioplaneettoja\" (joita kutsutaan my\u00f6s kiviplaneetoiksi, maanp\u00e4\u00e4llisiksi planeetoiksi tai maanp\u00e4\u00e4llisiksi planeetoiksi), koska niill\u00e4 kaikilla on kiinte\u00e4 kivipinta. N\u00e4it\u00e4 planeettoja kutsutaan my\u00f6s \"sis\u00e4iseksi aurinkokunnaksi\".<\/li>\n<\/ul>\n<ul>\n<li><strong>Ulkoinen aurinkokunta:<\/strong>\u00a0Marsia kauempana Auringosta olevat nelj\u00e4 suurinta planeettaa - Jupiter, Saturnus, Uranus ja Neptunus - ovat niin sanottuja kaasuj\u00e4ttil\u00e4isi\u00e4 (joita kutsutaan my\u00f6s kaasuplaneetoiksi tai Jovian planeetoiksi), koska niill\u00e4 ei ole kiinte\u00e4\u00e4 pintaa vaan ne koostuvat p\u00e4\u00e4asiassa kaasusta. N\u00e4it\u00e4 planeettoja kutsutaan my\u00f6s \"ulommaksi aurinkokunnaksi\".\n<ul>\n<li>Ulomman aurinkokunnan planeetat koostuvat p\u00e4\u00e4asiassa vedyst\u00e4 ja heliumista, joten niiden koostumus on hyvin samankaltainen kuin auringon. Jotkut tutkijat uskovat, ett\u00e4 planeetoilla saattaa olla kiinte\u00e4 ydin. Lis\u00e4ksi niill\u00e4 on renkaita, jotka sis\u00e4lt\u00e4v\u00e4t p\u00f6ly\u00e4, kive\u00e4 ja j\u00e4\u00e4t\u00e4. N\u00e4iden alkuaineiden koko vaihtelee suuresti; p\u00f6lyhiukkasista talon kokoisiin lohkareisiin.<\/li>\n<li>Saturnuksella on aurinkokuntamme planeetoista suurimmat ja n\u00e4kyvimm\u00e4t renkaat, mutta my\u00f6s Jupiterilla, Uranuksella ja Neptunuksella on renkaat.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Magneettikent\u00e4t:<\/strong>\u00a0Useimpia aurinkokuntamme planeettoja ymp\u00e4r\u00f6i magneettikentt\u00e4 (ns. magnetosf\u00e4\u00e4ri). My\u00f6s auringolla on magneettikentt\u00e4 (heliosf\u00e4\u00e4ri), joka kattaa koko aurinkokuntamme.<\/li>\n<\/ul>\n<ul>\n<li><strong>Kuut:<\/strong>\u00a0L\u00e4hes kaikilla aurinkokuntamme planeetoilla - ja joillakin kuilla - on ilmakeh\u00e4. Yksitt\u00e4isiss\u00e4 atomipalloissa olevat kemialliset aineet vaihtelevat kuitenkin paljon, ja ilmakehien k\u00e4ytt\u00e4ytyminen (planeettojen kiertoratojen eroista johtuen) on my\u00f6s moninaista. Esimerkiksi Pluton ilmakeh\u00e4 romahtaa, kun Pluto kiert\u00e4\u00e4 kaukana auringosta. Ilmakeh\u00e4 palautuu, kun planeetta l\u00e4hestyy Aurinkoa. T\u00e4m\u00e4 ilmi\u00f6 on useimmiten n\u00e4ht\u00e4viss\u00e4 komeetoissa\n<ul>\n<li>Aurinkokunnassamme on 166 tunnettua kuuta. T\u00e4m\u00e4 luku sis\u00e4lt\u00e4\u00e4 kuitenkin vain tunnustettujen kasvien kuut, joten esimerkiksi Pluton kuut j\u00e4\u00e4v\u00e4t pois.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li><strong>Kuiperin vy\u00f6:<\/strong>\u00a0Kuiperin vy\u00f6hyke sijaitsee noin 50 AU:n (50 kertaa Maan et\u00e4isyys Auringosta) p\u00e4\u00e4ss\u00e4 Auringosta - Neptunuksen kiertorataa seuraten - ja ulottuu 30-35 AU:n p\u00e4\u00e4h\u00e4n aurinkokuntaan. Kuiperin vy\u00f6ll\u00e4 on todenn\u00e4k\u00f6isesti satojatuhansia yli 100 km leveit\u00e4 j\u00e4isi\u00e4 kohteita ja yli 1 biljoona komeettaa (tai enemm\u00e4n).<\/li>\n<\/ul>\n<ul>\n<li><strong>Korvapilvi:<\/strong>\u00a0Oortin pilvi sijaitsee noin 50 000 AU:n p\u00e4\u00e4ss\u00e4 auringosta, ja se voi teoriassa ulottua 5 000-100 000 AU:n p\u00e4\u00e4h\u00e4n aurinkokunnasta. Oortin pilvi sis\u00e4lt\u00e4\u00e4 jopa 2 biljoonaa j\u00e4ist\u00e4 kohdetta ja eritt\u00e4in suuren m\u00e4\u00e4r\u00e4n komeettoja. On huomattava, ett\u00e4 Oortin pilve\u00e4 ei ole koskaan havaittu.<\/li>\n<li><strong>Heliosf\u00e4\u00e4ri:<\/strong>\u00a0Oortin pilven j\u00e4lkeen seuraa aurinkokunnan p\u00e4\u00e4, \"heliosf\u00e4\u00e4ri\", joka on auringon valtava pisaranmuotoinen magneettikentt\u00e4, joka ymp\u00e4r\u00f6i koko aurinkokuntaa ja koostuu s\u00e4hk\u00f6isesti varatuista hiukkasista. Monet t\u00e4htitieteilij\u00e4t uskovat, ett\u00e4 heliosf\u00e4\u00e4rin et\u00e4isyys auringosta on noin 15 miljardia kilometri\u00e4 auringosta<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Aurinkokunnan muodostuminen T\u00e4htitieteilij\u00f6iden tunnetuin teoria aurinkokunnan muodostumisesta on niin sanottu t\u00e4htisumuteoria, joka selitt\u00e4\u00e4 aurinkokunnan muodostumisen seuraavasti: Sumu: Aurinkosumuksi kutsuttu suuri py\u00f6riv\u00e4 kaasu- ja p\u00f6lypilvi syntyy (noin 4,5 miljardia vuotta sitten) Levy ... <a title=\"Aurinkokuntamme muodostuminen ja rakenne\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/fi\/the-formation-and-structure-of-our-solar-system\" aria-label=\"Lue lis\u00e4\u00e4 aiheesta Aurinkokuntamme muodostuminen ja rakenne\">Lue lis\u00e4\u00e4<\/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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