{"id":1119,"date":"2004-11-15T13:46:00","date_gmt":"2004-11-15T12:46:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_birth_of_galaxies\/"},"modified":"2026-10-08T00:36:12","modified_gmt":"2026-10-07T22:36:12","slug":"the_birth_of_galaxies","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_birth_of_galaxies\/","title":{"rendered":"Galaksien synty"},"content":{"rendered":"
\n

Emme voi n\u00e4hd\u00e4 mit\u00e4\u00e4n siit\u00e4, mit\u00e4 tapahtui maailmankaikkeuden ensimm\u00e4isten 300 000 vuoden aikana. Tutkijat yritt\u00e4v\u00e4t selvitt\u00e4\u00e4 sit\u00e4 atomihiukkasista saamansa tiedon ja tietokonemallien avulla.<\/p>\n<\/div>\n

Ainoa suora todiste itse alkur\u00e4j\u00e4hdyksest\u00e4 on heikko hehku avaruudessa. Avaruusalukset ja ilmapalloihin kiinnitetyt kaukoputket havaitsevat t\u00e4m\u00e4n ep\u00e4tasaisena kuviona, jossa kaasua on paikoin hieman l\u00e4mpim\u00e4mp\u00e4\u00e4 ja paikoin viile\u00e4mp\u00e4\u00e4 kaikkialla ymp\u00e4rill\u00e4mme. N\u00e4m\u00e4 aallot osoittavat my\u00f6s, miss\u00e4 vetypilvet olivat hieman tihe\u00e4mpi\u00e4.<\/p>\n

Miljoonien vuosien kuluessa tihe\u00e4t alueet vetiv\u00e4t puoleensa ainetta, koska niiden painovoima oli suurempi. Lopulta, noin 100 miljoonaa vuotta alkur\u00e4j\u00e4hdyksen j\u00e4lkeen, kaasu oli l\u00e4mmennyt ja tiivistynyt tarpeeksi, jotta ensimm\u00e4iset t\u00e4hdet pystyiv\u00e4t muodostumaan.<\/p>\n

Uusia t\u00e4hti\u00e4 syntyi 10 kertaa nopeammin kuin nykyisess\u00e4 maailmankaikkeudessa. Suurista t\u00e4htijoukoista muodostui pian ensimm\u00e4iset galaksit.<\/p>\n

\"Hubble's
Hubblen uusin kamera tarkkailee t\u00e4htien muodostumisen pes\u00e4kett\u00e4<\/figcaption><\/figure>\n

Hubble-avaruusteleskooppi ja tehokkaat maanp\u00e4\u00e4lliset teleskoopit ovat nyt alkaneet l\u00f6yt\u00e4\u00e4 galakseja, jotka syntyiv\u00e4t noin miljardi vuotta alkur\u00e4j\u00e4hdyksen j\u00e4lkeen. N\u00e4m\u00e4 pienet galaksit olivat paljon l\u00e4hemp\u00e4n\u00e4 toisiaan kuin galaksit ovat nyky\u00e4\u00e4n. T\u00f6rm\u00e4ykset olivat yleisi\u00e4. Aivan kuin kaksi toisiaan kohti liikkuvaa liekki\u00e4, ne sulautuivat yhteen suuremmiksi galakseiksi. My\u00f6s Linnunratamme syntyi t\u00e4ll\u00e4 tavalla.<\/p>","protected":false},"excerpt":{"rendered":"

We cannot see anything that happened during the first 300  000 years of the Universe. Scientists try to work it out from their knowledge of atomic particles and from computer […]<\/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\/05\/artist_s_impression_of_the_birth_of_our_galaxy2\/17907421-2-eng-GB\/Artist_s_impression_of_the_birth_of_our_Galaxy.jpg","esa_banner_description":"Artist's impression of the birth of our Galaxy","esa_banner_credit":"NASA and Adolf Schaller","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/05\/Artist_s_impression_of_the_birth_of_our_Galaxy2","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":[10,11,19],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1119","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1119","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=1119"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1119\/revisions"}],"predecessor-version":[{"id":4856,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/1119\/revisions\/4856"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=1119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=1119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=1119"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=1119"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=1119"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=1119"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=1119"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=1119"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=1119"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=1119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}