{"id":1133,"date":"2004-11-16T08:14:00","date_gmt":"2004-11-16T07:14:00","guid":{"rendered":"https:\/\/kids.esa.int\/planets_and_moons_life_on_earth\/"},"modified":"2026-10-08T00:36:23","modified_gmt":"2026-10-07T22:36:23","slug":"planets_and_moons_life_on_earth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/planets_and_moons_life_on_earth\/","title":{"rendered":"Livet p\u00e5 Jorden"},"content":{"rendered":"<div class=\"lede\">\n<p>Unders\u00f8gelser af fossiler i gamle bjergarter viser, at livet sandsynligvis opstod for omkring 4 milliarder \u00e5r siden, da Jorden var meget ung. Ingen ved, hvordan livet opstod p\u00e5 Jorden. De fleste forskere mener, at det opstod i flydende vand. Men var det i vandpytter p\u00e5 overfladen, under jorden eller p\u00e5 havbunden, hvor vulkansk aktivitet danner varme kilder?<\/p>\n<\/div>\n<p>Fors\u00f8g viser, at livets kemiske byggesten kan dannes i rummet eller p\u00e5 Jorden. Mange af dem m\u00e5 v\u00e6re kommet til Jorden med nedfaldende meteoritter og kometer. P\u00e5 en eller anden m\u00e5de fandt disse enkle \u2018organiske\u2019 kemikalier sammen og dannede mere avancerede molekyler. Derefter begyndte de at kopiere sig selv og vokse.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"264\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/09\/Dry_earth3\" 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\/2004\/09\/dry_earth3\/17868598-2-eng-GB\/Dry_earth.jpeg\" alt=\"Dry earth\"><figcaption>T\u00f8r jord<\/figcaption><\/figure>\n<p>Det, vi ved, er, at livet \u2013 n\u00e5r det f\u00f8rst er kommet i gang \u2013 er utroligt h\u00e5rdt. Der er fundet levende bakterier i det frosne Antarktis, i kogende vand og inde i klipper op til fem kilometer under jordoverfladen. Vi ved ogs\u00e5, at s\u00e5danne organismer kan overleve i \u00e5revis i rummets barske milj\u00f8.<\/p>\n<p>Da planterne blev udbredt, blev der frigivet store m\u00e6ngder ilt i luften. Jorden blev den eneste planet i vores solsystem med en iltrig atmosf\u00e6re. Ved at lede efter ilt p\u00e5 andre planeter kan vi m\u00e5ske en dag finde beviser p\u00e5 udenjordisk liv.<\/p>","protected":false},"excerpt":{"rendered":"<p>Studies of fossils in ancient rocks tell us that life probably began about 4 billion years ago, when the Earth was very young. No one knows how life began on [&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\/2003\/05\/dna_s_famous_double-helix_structure3\/17902899-2-eng-GB\/DNA_s_famous_double-helix_structure.jpg","esa_banner_description":"DNA's famous double-helix structure","esa_banner_credit":"ESA 2003. 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