{"id":195,"date":"2021-12-02T12:44:42","date_gmt":"2021-12-02T11:44:42","guid":{"rendered":"https:\/\/kids.esa.int\/galaxies\/"},"modified":"2026-10-08T00:25:21","modified_gmt":"2026-10-07T22:25:21","slug":"galaxies","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/galaxies\/","title":{"rendered":"Galaksit"},"content":{"rendered":"
\n

L\u00e4hes kaikki t\u00e4hdet kuuluvat valtaviin ryhmiin, joita kutsutaan galakseiksi. Aurinko on yksi v\u00e4hint\u00e4\u00e4n 100 miljardista t\u00e4hdest\u00e4 meid\u00e4n galaksissamme, Linnunradassa. Ja maailmankaikkeudessa on miljardeja galakseja.<\/p>\n<\/div>\n

Mihin tahansa taivaalle katsommekin, siell\u00e4 on eri muotoisia ja kokoisia galakseja. Jotkut ovat spiraaligalakseja, joiden kaarevat k\u00e4sivarret kietoutuvat kirkkaan keskuksen ymp\u00e4rille.<\/p>\n

Joissakin galaksissa on keskell\u00e4 t\u00e4htien muodostama palkki, jonka molemmissa p\u00e4iss\u00e4 on haaroja. Toisissa galaksissa ei ole lainkaan tunnistettavaa muotoa. Suurimmat galaksit n\u00e4ytt\u00e4v\u00e4t litistyneilt\u00e4 palloilta. Niiss\u00e4 on jopa 10 miljoonaa miljoonaa t\u00e4hte\u00e4, mutta niiss\u00e4 on hyvin v\u00e4h\u00e4n kaasua tai p\u00f6ly\u00e4. L\u00e4hes kaikissa galaksissa on keskell\u00e4 supermassiivinen musta aukko.<\/p>\n

\"When
Kun galaksit t\u00f6rm\u00e4\u00e4v\u00e4t toisiinsa, kuten Antennae-galaksit osoittavat<\/figcaption><\/figure>\n

Galaksit syntyiv\u00e4t vain muutama sata miljoonaa vuotta maailmankaikkeuden syntymisen j\u00e4lkeen. Tuolloin, noin 13 miljardia vuotta sitten, galaksit olivat pieni\u00e4 ja sijaitsivat paljon l\u00e4hemp\u00e4n\u00e4 toisiaan. T\u00f6rm\u00e4ykset olivat yleisi\u00e4. Kun galaksit t\u00f6rm\u00e4siv\u00e4t toisiinsa, ne kasvoivat kooltaan ja muuttivat muotoaan.<\/p>\n

Siit\u00e4 l\u00e4htien maailmankaikkeus on laajentunut. Suurin osa galakseista liikkuu toisistaan poisp\u00e4in suurella nopeudella, lukuun ottamatta galaksijoukkoja, joissa galaksit kiert\u00e4v\u00e4t toisiaan.<\/p>","protected":false},"excerpt":{"rendered":"

Nearly all stars belong to gigantic groups known as galaxies. The Sun is one of at least 100 billion stars in our galaxy, the Milky Way. And there are billions […]<\/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\/spiral_galaxy_ngc_12322\/17874740-2-eng-GB\/Spiral_galaxy_NGC_1232.jpg","esa_banner_description":"Spiral galaxy NGC 1232","esa_banner_credit":"Spaceweek International","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Spiral_galaxy_NGC_12322","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":[10,11,21],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-195","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=195"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/195\/revisions"}],"predecessor-version":[{"id":4351,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/195\/revisions\/4351"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=195"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=195"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=195"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=195"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=195"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=195"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=195"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}