{"id":391,"date":"2018-05-07T12:06:00","date_gmt":"2018-05-07T10:06:00","guid":{"rendered":"https:\/\/kids.esa.int\/mystery_of_the_missing_matter\/"},"modified":"2026-10-08T00:27:38","modified_gmt":"2026-10-07T22:27:38","slug":"mystery_of_the_missing_matter","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/mystery_of_the_missing_matter\/","title":{"rendered":"Kadonneen aineen mysteeri"},"content":{"rendered":"<div class=\"lede\">\n<p>Tiesitk\u00f6, ett\u00e4 maailmankaikkeudesta n\u00e4ytt\u00e4\u00e4 puuttuvan osan aineesta? Olet ehk\u00e4 kuullut pime\u00e4st\u00e4 aineesta, joka on hyvin salaper\u00e4ist\u00e4 ja jota tutkijat eiv\u00e4t ole viel\u00e4 l\u00f6yt\u00e4neet. Kuitenkin my\u00f6s tavallinen aine, josta koostuvat meille tutut asiat \u2013 t\u00e4hdet, planeetat ja kaikki, mit\u00e4 voimme n\u00e4hd\u00e4, koskettaa tai haistaa \u2013 voi olla salaper\u00e4ist\u00e4! Tutkimalla l\u00e4heisi\u00e4 galakseja olemme havainneet, ett\u00e4 joissakin niist\u00e4 on kolme kertaa v\u00e4hemm\u00e4n ainetta kuin odottaisimme. Omassa galaksissamme \u2013 Linnunradassa \u2013 on alle puolet siit\u00e4 aineesta, mit\u00e4 siin\u00e4 pit\u00e4isi olla! Miss\u00e4 t\u00e4m\u00e4 puuttuva aine on?<\/p>\n<\/div>\n<p>T\u00e4htitieteilij\u00e4t ovat k\u00e4ytt\u00e4neet paljon aikaa ja vaivaa yritt\u00e4ess\u00e4\u00e4n j\u00e4ljitt\u00e4\u00e4 kadonneen aineen. Sen sijaan, ett\u00e4 se sijaitsisi galaksien p\u00e4\u00e4osassa, jossa suurin osa t\u00e4hdist\u00e4 on, er\u00e4\u00e4lle tutkijaryhm\u00e4lle tuli ajatus: ehk\u00e4 t\u00e4m\u00e4 aine sijaitsee galaksien haloeissa. Haloja ovat galakseja ymp\u00e4r\u00f6iv\u00e4t kuuman kaasun alueet. Haloja on vaikea havaita, ja t\u00e4htitieteilij\u00e4t pystyv\u00e4t yleens\u00e4 vain kurkistamaan niiden sis\u00e4\u00e4n, eiv\u00e4tk\u00e4 n\u00e4e kovin kauas. Voisivatko galaksien halot olla t\u00e4ydellinen piilopaikka maailmankaikkeuden kadonneelle aineelle?<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2500\" data-credit=\"ESA-C. Carreau\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/XMM-Newton\" 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\/xmm-newton\/17879070-2-eng-GB\/XMM-Newton.jpg\" alt=\"XMM-Newton\"><figcaption>XMM-Newton<\/figcaption><\/figure>\n<p>T\u00e4htitieteilij\u00f6iden ryhm\u00e4 on k\u00e4ytt\u00e4nyt ESA:n XMM-Newton-nimist\u00e4 avaruusteleskooppia tutkiakseen galaksien haloja aiempaa syvemm\u00e4lt\u00e4 aineen etsimiseksi. XMM-Newton on r\u00f6ntgenteleskooppi, mik\u00e4 tarkoittaa, ett\u00e4 se ei n\u00e4e tavallista valoa, jonka silm\u00e4mme havaitsevat, vaan se havaitsee r\u00f6ntgens\u00e4teily\u00e4. Galaksien haloiden tutkiminen r\u00f6ntgens\u00e4teiden avulla mahdollistaa tarkemmat havainnot!<\/p>\n<p>Tutkimusryhm\u00e4 tarkasteli kuutta spiraaligalaksia etsien vihjeit\u00e4 aineen mahdollisesta esiintymisest\u00e4. Tarkistettuaan tiedot he olivat valmiita julkistamaan tuloksensa: l\u00e4hes kolme nelj\u00e4sosaa odotetusta aineesta puuttui edelleen!<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"3774\" data-credit=\"ESA\/XMM-Newton; J-T. Li (University of Michigan, USA); Sloan Digital Sky Survey (SDSS)\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Searching_galactic_haloes_for_missing_matter\" 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\/searching_galactic_haloes_for_missing_matter\/17907606-2-eng-GB\/Searching_galactic_haloes_for_missing_matter.jpg\" alt=\"Searching galactic haloes for \u2018missing\u2019 matter\"><figcaption>\u2018Kadonneen\u2019 aineen etsiminen galaksien halosta<\/figcaption><\/figure>\n<p>Miss\u00e4 se siis voisi olla? Teorioita on muutamia. Ehk\u00e4 se on tallennettuna johonkin kaasun muotoon, jota on vaikea havaita. Se voisi sijaita avaruuden osassa, jota emme ole viel\u00e4 tutkineet. Tai ehk\u00e4 aine onkin siell\u00e4 halojen sis\u00e4ll\u00e4, mutta sen r\u00f6ntgens\u00e4teily on niin heikkoa, ettei edes XMM-Newton pysty havaitsemaan sit\u00e4.<\/p>\n<p>Tutkijat ovat innokkaita jatkamaan tutkimuksia. Ehk\u00e4 jonain p\u00e4iv\u00e4n\u00e4 saamme ratkaistua kadonneen aineen mysteerin!<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> ESAn tuleva Advanced Telescope for High-ENergy Astrophysics -teleskooppi tutkii galaksien ulko-osia etsiess\u00e4\u00e4n kadonnutta ainetta.<\/p>","protected":false},"excerpt":{"rendered":"<p>Did you know that the Universe seems to be missing some matter? You may have heard of dark matter, which is very mysterious and has yet to be found by [&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\/anatomy_of_the_milky_way\/17882733-2-eng-GB\/Anatomy_of_the_Milky_Way.jpg","esa_banner_description":"Anatomy of the Milky Way","esa_banner_credit":"NASA\/JPL-Caltech; right: ESA; layout: ESA\/ATG medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/05\/Anatomy_of_the_Milky_Way","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-391","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/391","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=391"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/391\/revisions"}],"predecessor-version":[{"id":4438,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/391\/revisions\/4438"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=391"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=391"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=391"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=391"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=391"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=391"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=391"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=391"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}