{"id":189,"date":"2021-12-02T12:47:40","date_gmt":"2021-12-02T11:47:40","guid":{"rendered":"https:\/\/kids.esa.int\/spacecraft_gaia_satellite_maps_over_a_billion_stars\/"},"modified":"2026-10-08T00:25:17","modified_gmt":"2026-10-07T22:25:17","slug":"spacecraft_gaia_satellite_maps_over_a_billion_stars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/spacecraft_gaia_satellite_maps_over_a_billion_stars\/","title":{"rendered":"Gaia-satelliitti kartoittaa yli miljardi t\u00e4hte\u00e4!"},"content":{"rendered":"<div class=\"lede\">\n<p>Euroopan avaruusj\u00e4rjest\u00f6n (ESA) Gaia-satelliitti on kartoittanut taivasta 22 kuukauden ajan tarkemmin kuin koskaan aiemmin. Nyt t\u00e4htitieteilij\u00e4t ovat hy\u00f6dynt\u00e4neet n\u00e4it\u00e4 tietoja luodakseen uuden avaruuskartan, joka esitt\u00e4\u00e4 Linnunradan uskomattoman yksityiskohtaisesti!<\/p>\n<\/div>\n<p>T\u00e4m\u00e4 uusi kartta sis\u00e4lt\u00e4\u00e4 eritt\u00e4in tarkkoja mittaustietoja yli miljardista t\u00e4hdest\u00e4, mukaan lukien niiden sijainnit ja liikkeet avaruudessa. Gaia mittasi my\u00f6s joidenkin t\u00e4htien v\u00e4ri\u00e4, kirkkautta ja pintal\u00e4mp\u00f6tiloja. Se ker\u00e4si tietoja jopa joistakin galaksimme ulkopuolella sijaitsevista t\u00e4hdist\u00e4. My\u00f6s 14 000 aurinkokuntamme sis\u00e4ll\u00e4 olevaa asteroidia rekister\u00f6itiin, mik\u00e4 antoi lis\u00e4tietoa n\u00e4ist\u00e4 avaruuden outoista kivist\u00e4. Uskomatonta kyll\u00e4, Gaia merkitsi muistiin puolen miljoonan kaukaisen kvasaarin sijainnit \u2013 n\u00e4m\u00e4 ovat kirkkaita galakseja, joiden energianl\u00e4hteen\u00e4 toimivat niiden ytimiss\u00e4 sijaitsevat supermassiiviset mustat aukot!<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"4300\" data-credit=\"ESA\/Gaia\/DPAC\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Gaia_s_sky_in_colour\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/05\/gaia_s_sky_in_colour\/17897126-2-eng-GB\/Gaia_s_sky_in_colour.jpg\" alt=\"Gaia\u2019s sky in colour\"><figcaption>Gaiasta v\u00e4rillinen taivas<\/figcaption><\/figure>\n<p>Gaia-missio on selv\u00e4stikin eritt\u00e4in t\u00e4rke\u00e4, joten noin 450 tutkijaa ja ohjelmistokehitt\u00e4j\u00e4\u00e4 on ty\u00f6skennellyt satelliitin tietojen muuntamiseksi t\u00e4htikartaksi. T\u00e4htitieteilij\u00e4t ymp\u00e4ri maailmaa p\u00e4\u00e4sev\u00e4t nyt k\u00e4siksi kaikkiin n\u00e4ihin tietoihin, ja he ovat eritt\u00e4in innoissaan! Jo lyhytkin kartan tutkiminen on riitt\u00e4nyt parantamaan ymm\u00e4rryst\u00e4mme galaksimme t\u00e4htien i\u00e4st\u00e4 ja siit\u00e4, miten t\u00e4hdet liikkuvat avaruudessa, mik\u00e4 on olennaista tutkittaessa, miten t\u00e4hdet muodostuvat ja muuttuvat ajan my\u00f6t\u00e4.<\/p>\n<p>Uusia tietoja on k\u00e4ytetty my\u00f6s 75 pallomaisen t\u00e4htijoukon ja 12 k\u00e4\u00e4pi\u00f6galaksin kiertoratojen laskemiseen; n\u00e4m\u00e4 kiert\u00e4v\u00e4t Linnunradan ymp\u00e4rill\u00e4. T\u00e4m\u00e4 auttaa meit\u00e4 tutkimaan Linnunradan ja sen ymp\u00e4rist\u00f6\u00e4 sellaisena kuin se on nyt, sellaisena kuin se oli menneisyydess\u00e4, sek\u00e4 ennustamaan, millainen se on tulevaisuudessa. Miten painovoima vaikuttaa avaruudessa liikkuvien kohteiden liikkeeseen, ja kuinka suuri vaikutus salaper\u00e4isell\u00e4 pime\u00e4ll\u00e4 aineella on? Gaia-satelliitin ansiosta t\u00e4htitieteilij\u00f6ill\u00e4 on k\u00e4yt\u00f6ss\u00e4\u00e4n runsaasti uusia johtolankoja.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2560\" data-credit=\"ESA, CC BY-SA 3.0 IGO\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Cosmic_scales_covered_by_Gaia_s_second_data_release\" data-licence=\"CC BY-SA 3.0 IGO or ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/05\/cosmic_scales_covered_by_gaia_s_second_data_release\/17874260-2-eng-GB\/Cosmic_scales_covered_by_Gaia_s_second_data_release.jpg\" alt=\"Cosmic scales covered by Gaia\u2019s second data release\"><figcaption>Gaian toisessa tietojulkaisussa k\u00e4sitellyt kosmologiset mittakaavat<\/figcaption><\/figure>\n<p>ESAn tiedejohtaja G\u00fcnther Hasinger totesi, ett\u00e4 \u201cGaiasta ker\u00e4tyt havainnot m\u00e4\u00e4rittelev\u00e4t t\u00e4htitieteen perusteet uudelleen\u201d. T\u00e4m\u00e4 on todella j\u00e4nnitt\u00e4v\u00e4 aika avaruudesta kiinnostuneille! Mit\u00e4 Gaia-kartta auttaa meit\u00e4 l\u00f6yt\u00e4m\u00e4\u00e4n seuraavaksi?<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Joitakin t\u00e4hti\u00e4 mitattiin yht\u00e4 tarkasti kuin jos maapallolla oleva tarkkailija pystyisi havaitsemaan euron kolikon Kuun pinnalla!<\/p>","protected":false},"excerpt":{"rendered":"<p>A European Space Agency satellite called Gaia has spent 22 months charting the sky in more detail than ever before. Now astronomers have used this data to make a new [&hellip;]<\/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\/2018\/05\/artist_s_impression_of_gaia\/18247105-2-eng-GB\/Artist_s_impression_of_Gaia.jpg","esa_banner_description":"Artist's impression of Gaia","esa_banner_credit":"ESA\u2013D. 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