{"id":661,"date":"2008-07-04T09:36:00","date_gmt":"2008-07-04T07:36:00","guid":{"rendered":"https:\/\/kids.esa.int\/can_et_hear_the_sounds_of_earth\/"},"modified":"2026-10-08T00:30:51","modified_gmt":"2026-10-07T22:30:51","slug":"can_et_hear_the_sounds_of_earth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/can_et_hear_the_sounds_of_earth\/","title":{"rendered":"Kan ET h\u00f8re lydene fra Jorden?"},"content":{"rendered":"<div class=\"lede\">\n<p>ESA\u2019s fire Cluster-rumfart\u00f8jer har opdaget, at Jorden og andre planeter har en m\u00e5de at r\u00e5be \u201cJeg er her!\u201d til resten af galaksen. Beskederne fra planeterne kan dog kun opfanges og forst\u00e5s ved hj\u00e6lp af store radioteleskoper. En fremmed race, der opfanger Jordens naturlige radiosignaler, vil h\u00f8re en r\u00e6kke pip og fl\u00f8jt, lidt ligesom n\u00e5r man lytter til R2-D2, robotten fra Star Wars.<\/p>\n<\/div>\n<p>Selv de mest moderne teleskoper er i dag ikke kraftige nok til at opdage planeter p\u00e5 st\u00f8rrelse med Jorden omkring fjerne stjerner. Det samme problem st\u00e5r fremmede astronomer over for \u2013 at lede efter Jorden ville v\u00e6re som at lede efter en n\u00e5l i en h\u00f8stak. Men vores planets radioudbrud \u2013 som er 10.000 gange st\u00e6rkere end det kraftigste milit\u00e6re radarsignal \u2013 afsl\u00f8rer tydeligt Jordens tilstedev\u00e6relse.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/Media\/Animations\/Auroral-2HQ\" 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\/media\/animations\/auroral-2hq\/9257-5-eng-GB\/Auroral-2HQ.jpg\" alt=\"\"><\/figure>\n<p>Forskere har siden 1970\u2019erne vidst, at planeter med magnetfelter (herunder Jorden, Jupiter og Saturn) udsender st\u00e6rke radiosignaler. Signalerne genereres h\u00f8jt over hver planet af de samme solpartikler, som f\u00e5r nordlys til at lyse op p\u00e5 himlen nedenunder. Indtil nu havde astronomer antaget, at disse radiob\u00f8lger bev\u00e6gede sig ud i rummet i en stadig bredere kegle, ligesom lyset fra en lommelygte. Takket v\u00e6re Cluster ved vi nu, at dette ikke er sandt.<\/p>\n<p>Efterh\u00e5nden som radiob\u00f8lgerne skyllet hen over hvert rumfart\u00f8j efter tur, kunne forskerne beregne deres st\u00f8rrelse og placering. Det viser sig, at signalerne bev\u00e6ger sig gennem rummet i en smal str\u00e5le. Det g\u00f8r det meget nemmere at fastsl\u00e5 pr\u00e6cis, hvor de kommer fra. I fremtiden kan vi m\u00e5ske finde fremmede verdener ved at lytte efter deres pip og fl\u00f8jt.<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA\u2019s four Cluster spacecraft have found that Earth and other planets have a way of shouting \u201cI\u2019m here!\u201d to the rest of the Galaxy. However, the messages from the planets [&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\/2002\/08\/the_cluster_constellation\/17863826-3-eng-GB\/The_Cluster_constellation.jpg","esa_banner_description":"The Cluster constellation","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/08\/The_Cluster_constellation","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":[14,10,13],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-661","post","type-post","status-publish","format-standard","hentry","category-are-we-alone","category-learn","category-life-in-space"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/661","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=661"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/661\/revisions"}],"predecessor-version":[{"id":4616,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/661\/revisions\/4616"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=661"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=661"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=661"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=661"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=661"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=661"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=661"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=661"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}