{"id":182,"date":"2021-12-02T12:50:43","date_gmt":"2021-12-02T11:50:43","guid":{"rendered":"https:\/\/kids.esa.int\/planets_and_moons_exoplanets\/"},"modified":"2026-10-08T00:25:12","modified_gmt":"2026-10-07T22:25:12","slug":"planets_and_moons_exoplanets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/planets_and_moons_exoplanets\/","title":{"rendered":"Eksoplaneter"},"content":{"rendered":"<div class=\"lede\">\n<p>Den <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Planets_and_moons\/The_Solar_System_and_its_planets\" target=\"_blank\" rel=\"noopener\">Solsystemet<\/a> indeholder otte planeter, der kredser om vores stjerne, <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/The_Sun\/Our_nearest_star\" target=\"_blank\" rel=\"noopener\">Solen<\/a>. Men vidste du, at der findes mange, mange flere planeter derude i rummet, som kredser om <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Stars_and_galaxies\/Stars\" target=\"_blank\" rel=\"noopener\">stjerner<\/a> vi ser om natten? Disse kaldes planeter uden for solsystemet, eller kort sagt exoplaneter.<\/p>\n<p>Det er yderst vanskeligt at opdage exoplaneter. De befinder sig s\u00e5 langt v\u00e6k, at vi ikke blot kan kigge gennem et almindeligt teleskop og se dem. De er desuden meget sm\u00e5 og svage i forhold til de stjerner, de kredser om. Det betyder, at astronomer, der leder efter exoplaneter, er n\u00f8dt til at bruge nogle smarte teknikker!<\/p>\n<\/div>\n<p>Den f\u00f8rste metode, som astronomer brugte til at finde exoplaneter, kaldes radialhastighed, men den har et mere simpelt k\u00e6lenavn: stjernens vuggen! N\u00e5r en planet kredser om en stjerne, vil planetens <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Our_Universe\/Story_of_the_Universe\/Gravity\" target=\"_blank\" rel=\"noopener\">tyngdekraften<\/a> tr\u00e6kker i stjernen, hvilket fra vores perspektiv f\u00e5r det til at se ud, som om stjernen vakler i rummet. Effekten er lille, men ved hj\u00e6lp af meget f\u00f8lsomme instrumenter kan man muligvis opdage nogle exoplaneter, der f\u00e5r deres stjerner til at vakle!<\/p>\n<p>I dag er transitmetoden en mere udbredt detekteringsteknik. N\u00e5r en exoplanet passerer foran sin stjerne, kan den blokere en ubetydelig del af stjernens lys. Dette kaldes en transit. Set fra Jorden ser stjernen lidt svagere ud under transitten og bliver derefter lysere igen, n\u00e5r planeten ikke l\u00e6ngere blokerer for lyset. Det er et tegn p\u00e5, at der muligvis er en exoplanet til stede! Transitter er sv\u00e6re at opdage, fordi \u00e6ndringen i lysstyrken er s\u00e5 lille, men specielle teleskoper til planetjagt, s\u00e5som ESA\u2019s <a href=\"https:\/\/sci.esa.int\/web\/corot\" target=\"_blank\" rel=\"noopener\">CoRoT<\/a> har v\u00e6ret en stor succes! ESA\u2019s 2019 <a href=\"https:\/\/sci.esa.int\/web\/cheops\" target=\"_blank\" rel=\"noopener\">CHEOPS<\/a> Missionen anvender ogs\u00e5 transitmetoden.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2500\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/02\/Transiting_exoplanet\" 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\/2019\/02\/transiting_exoplanet\/19220628-1-eng-GB\/Transiting_exoplanet.jpg\" alt=\"Transiting exoplanet\"><figcaption>En exoplanet i transit<\/figcaption><\/figure>\n<p>Astrometri er en anden teknik, som vil blive anvendt af ESA\u2019s <a href=\"https:\/\/sci.esa.int\/web\/gaia\" target=\"_blank\" rel=\"noopener\">Gaia<\/a> mission. Om natten kan vi se stjerner bev\u00e6ge sig i baner hen over himlen, og vi kan forudsige deres positioner med ekstrem n\u00f8jagtighed over mange \u00e5r. Hvis en stjerne har en planet, vil dens bev\u00e6gelse afvige en smule fra det forventede \u2013 kun en ganske lille smule, men nok til, at Gaia kan registrere det!<\/p>\n<p>Dette er de vigtigste metoder til at opdage exoplaneter, selvom der ogs\u00e5 findes andre. Nogle gange er det endda muligt at bruge professionelle observatorier til at tage fotografier \u2013 selvom disse billeder virker meget enkle sammenlignet med de billeder, vi kan tage af de n\u00e6rliggende planeter i vores eget solsystem.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"4042\" data-credit=\"ESA \u2013 SJM Photography\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/10\/Children_imagine_exoplanets\" 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\/2019\/10\/children_imagine_exoplanets\/20819272-1-eng-GB\/Children_imagine_exoplanets.jpg\" alt=\"Children imagine exoplanets\"><figcaption>B\u00f8rn forestiller sig exoplaneter<\/figcaption><\/figure>\n<p>Ved hj\u00e6lp af alle disse metoder er der indtil videre blevet opdaget tusindvis af exoplaneter, og vi finder hele tiden flere. Kunne der v\u00e6re liv p\u00e5 nogen af dem? M\u00e5ske endda <a href=\"https:\/\/www.esa.int\/kids\/en\/learn\/Life_in_Space\/Are_we_alone\/Are_we_alone\" target=\"_blank\" rel=\"noopener\">intelligente v\u00e6sener<\/a> Ligesom os? Hvad synes du?<\/p>\n<p>Det er bestemt en meget sp\u00e6ndende tid at interessere sig for exoplaneter!<\/p>","protected":false},"excerpt":{"rendered":"<p>The Solar System contains eight planets orbiting our local star, the Sun. But did you know that there are many, many more planets out there in space, orbiting the stars [&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\/2019\/09\/hubble_finds_water_vapor_on_habitable-zone_exoplanet_for_the_first_time\/19700242-1-eng-GB\/Hubble_Finds_Water_Vapor_on_Habitable-Zone_Exoplanet_for_the_First_Time.jpg","esa_banner_description":"We do not yet have the technology to take detailed photos of exoplanets, but an artist created this picture of what one may look like. Copyright: ESA\/Hubble, M. Kornmesser","esa_banner_credit":"ESA\/Hubble, M. Kornmesser","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2019\/09\/Hubble_finds_water_vapor_on_habitable-zone_exoplanet_for_the_first_time","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":[10,11,12],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-182","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=182"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":4346,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/182\/revisions\/4346"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=182"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=182"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=182"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=182"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=182"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=182"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=182"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}