{"id":623,"date":"2013-10-02T11:25:00","date_gmt":"2013-10-02T09:25:00","guid":{"rendered":"https:\/\/kids.esa.int\/europe_prepares_to_map_a_billion_stars\/"},"modified":"2026-10-08T00:30:23","modified_gmt":"2026-10-07T22:30:23","slug":"europe_prepares_to_map_a_billion_stars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/europe_prepares_to_map_a_billion_stars\/","title":{"rendered":"Europa f\u00f6rbereder sig f\u00f6r att kartl\u00e4gga en miljard stj\u00e4rnor"},"content":{"rendered":"<div class=\"lede\">\n<p>Den mest kraftfulla stj\u00e4rnkartl\u00e4ggaren som n\u00e5gonsin byggts kommer att skjutas upp fr\u00e5n Europas rymdbas i Franska Guyana den 19 december. En Sojuz-raket kommer att skicka det 2 ton tunga rymdobservatoriet, k\u00e4nt som Gaia, 1,5 miljoner km fr\u00e5n jorden. D\u00e4rifr\u00e5n kommer den under de kommande fem \u00e5ren att genomf\u00f6ra en inventering av cirka en miljard stj\u00e4rnor i v\u00e5r galax, Vintergatan.<\/p>\n<\/div>\n<p>Gaia kommer att skicka tillbaka de mest exakta uppgifterna som n\u00e5gonsin samlats in om dessa stj\u00e4rnors positioner, r\u00f6relser och ljusstyrka. Var och en av de utvalda stj\u00e4rnorna kommer att observeras cirka 70 g\u00e5nger under det fem\u00e5riga uppdraget. Det inneb\u00e4r i genomsnitt 40 miljoner observationer per dag! Positionerna f\u00f6r de ljusare objekten (som \u00e4nd\u00e5 \u00e4r 4 000 g\u00e5nger svagare \u00e4n vad som kan ses med blotta \u00f6gat) kommer att kartl\u00e4ggas med en noggrannhet som kan j\u00e4mf\u00f6ras med att m\u00e4ta bredden p\u00e5 ett m\u00e4nniskoh\u00e5r fr\u00e5n ett avst\u00e5nd p\u00e5 1 000 km.<\/p>\n<p>F\u00f6r att uppn\u00e5 denna enast\u00e5ende precision \u00e4r Gaia utrustad med ett extremt k\u00e4nsligt \u201c\u00f6ga\u201d \u2013 den st\u00f6rsta digitalkameran som n\u00e5gonsin skickats upp i rymden. Detta g\u00f6r det m\u00f6jligt f\u00f6r Gaia att uppt\u00e4cka objekt som \u00e4r en miljon g\u00e5nger svagare \u00e4n vad v\u00e5ra \u00f6gon kan se. Den \u00e4r dessutom utrustad med tv\u00e5 optiska teleskop och tre vetenskapliga instrument, samt en 10 meter bred \u201ckjol\u201d som fungerar som solskydd och genererar solenergi.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1500\" data-credit=\"ESA\/Herschel\/PACS\/SPIRE\/J.Fritz, U.Gent\/XMM-Newton\/EPIC\/W. Pietsch, MPE\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2011\/12\/Andromeda_Galaxy_in_infrared_and_X-rays2\" 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\/2011\/12\/andromeda_galaxy_in_infrared_and_x-rays2\/17896053-2-eng-GB\/Andromeda_Galaxy_in_infrared_and_X-rays.jpg\" alt=\"Andromeda Galaxy in infrared and X-rays\"><figcaption>Andromedagalaxen i infrar\u00f6tt ljus och r\u00f6ntgenstr\u00e5lning<\/figcaption><\/figure>\n<p>Gaias huvuduppgift kommer att vara att skapa en 3D-karta \u00f6ver galaxen. Men man f\u00f6rv\u00e4ntar sig ocks\u00e5 att den ska uppt\u00e4cka hundratusentals asteroider och kometer i v\u00e5rt solsystem, tiotusentals \u2018misslyckade\u2019 stj\u00e4rnor, s\u00e5 kallade bruna dv\u00e4rgar, 20 000 exploderande stj\u00e4rnor, s\u00e5 kallade supernovor, och hundratusentals aktiva galaxer, s\u00e5 kallade kvasarer.<\/p>\n<p>Gaia kommer ocks\u00e5 att uppt\u00e4cka minst 7 000 planeter som kretsar kring avl\u00e4gsna stj\u00e4rnor. Detta kommer att ske genom att man uppt\u00e4cker sm\u00e5 r\u00f6relser i en stj\u00e4rnas position n\u00e4r en n\u00e4rliggande planet drar i stj\u00e4rnan. Vid uppdragets slut kommer den att ha skickat tillbaka 1 petabyte (1 miljon gigabyte) data, vilket r\u00e4cker f\u00f6r att fylla 200 000 DVD-skivor.<\/p>","protected":false},"excerpt":{"rendered":"<p>The most powerful star mapper ever built will be launched from Europe\u2019s spaceport in French Guiana on 19 December. A Soyuz rocket will send the 2 tonne space observatory, known [&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\/2013\/10\/artist_s_impression_of_gaia\/17906940-2-eng-GB\/Artist_s_impression_of_Gaia.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2013\/10\/Artist_s_impression_of_Gaia","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-623","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\/sv\/wp-json\/wp\/v2\/posts\/623","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=623"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/623\/revisions"}],"predecessor-version":[{"id":4590,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/623\/revisions\/4590"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=623"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=623"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=623"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=623"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=623"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=623"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=623"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=623"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=623"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=623"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}