{"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\/sv\/planets_and_moons_life_on_earth\/","title":{"rendered":"Livet p\u00e5 jorden"},"content":{"rendered":"<div class=\"lede\">\n<p>Studier av fossiler i ur\u00e5ldriga bergarter visar att livet troligen uppstod f\u00f6r cirka 4 miljarder \u00e5r sedan, n\u00e4r jorden var mycket ung. Ingen vet hur livet uppstod p\u00e5 jorden. De flesta forskare tror att det uppstod i flytande vatten. Men var det i vattenp\u00f6lar p\u00e5 ytan, under jord eller p\u00e5 havsbotten d\u00e4r vulkanisk aktivitet bildar varma k\u00e4llor?<\/p>\n<\/div>\n<p>Experiment visar att livets kemiska byggstenar kan bildas b\u00e5de i rymden och p\u00e5 jorden. M\u00e5nga av dem m\u00e5ste ha kommit till jorden med fallande meteoriter och kometer. P\u00e5 n\u00e5got s\u00e4tt f\u00f6renades dessa enkla \u2018organiska\u2019 kemikalier och bildade mer avancerade molekyler. D\u00e4refter b\u00f6rjade de kopiera sig sj\u00e4lva och v\u00e4xa.<\/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>Torr jord<\/figcaption><\/figure>\n<p>Vad vi d\u00e4remot vet \u00e4r att livet \u2013 n\u00e4r det v\u00e4l har kommit ig\u00e5ng \u2013 \u00e4r oerh\u00f6rt tufft. Levande bakterier har p\u00e5tr\u00e4ffats i den frusna Antarktis, i kokande vatten och inuti bergarter upp till fem kilometer under jordytan. Vi vet ocks\u00e5 att s\u00e5dana organismer kan \u00f6verleva i flera \u00e5r i rymdens og\u00e4stv\u00e4nliga milj\u00f6.<\/p>\n<p>N\u00e4r v\u00e4xterna b\u00f6rjade sprida sig sl\u00e4pptes stora m\u00e4ngder syre ut i luften. Jorden blev den enda planeten i v\u00e5rt solsystem med en syrerik atmosf\u00e4r. Genom att s\u00f6ka efter syre p\u00e5 andra v\u00e4rldar kanske vi en dag hittar bevis p\u00e5 utomjordiskt 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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