{"id":982,"date":"2008-10-17T09:18:00","date_gmt":"2008-10-17T07:18:00","guid":{"rendered":"https:\/\/kids.esa.int\/solving_the_mysteries_of_a_martian_moon\/"},"modified":"2026-10-08T00:34:29","modified_gmt":"2026-10-07T22:34:29","slug":"solving_the_mysteries_of_a_martian_moon","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/solving_the_mysteries_of_a_martian_moon\/","title":{"rendered":"\u00c5 l\u00f8se mysteriene rundt en m\u00e5ne rundt Mars"},"content":{"rendered":"<div class=\"lede\">\n<p>I 1877 oppdaget den amerikanske astronomen Asaph Hall to sm\u00e5 m\u00e5ner som kretset rundt planeten Mars. De fikk navnene Phobos (Frykt) og Deimos (Panikk). Mer enn 130 \u00e5r senere pr\u00f8ver forskere fortsatt \u00e5 l\u00f8se mysteriene rundt disse m\u00e5nene. Nylige n\u00e6rpasseringer av ESAs romfart\u00f8y Mars Express har imidlertid gitt ledetr\u00e5der om hva de best\u00e5r av og hvor de kommer fra.<\/p>\n<\/div>\n<p>Mars Express er det eneste romfart\u00f8yet som for tiden er i drift rundt den r\u00f8de planeten, og som befinner seg i en sv\u00e6rt elliptisk (eggformet) bane. Denne banen f\u00f8rer den tvers over Phobos\u2019 bane, slik at den kan se alle sider av den lille m\u00e5nen. (I likhet med Jordens m\u00e5ne vender Phobos alltid den samme siden mot den n\u00e6rliggende planeten.) Mellom 23. juli og 15. september 2008 gjennomf\u00f8rte Mars Express \u00e5tte forbiflyvninger av Phobos, og suste forbi i avstander fra 4 500 km til bare 93 km.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA\/ DLR (K.Willner)\/ FU Berlin (G. Neukum)\" data-detail-url=\"https:\/\/www.esa.int\/Media\/Animations\/Phobos_animation_-_Image2_422-20081013-0000-6-mov-01-PhobosSeries\" 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\/phobos_animation_-_image2_422-20081013-0000-6-mov-01-phobosseries\/4172-5-eng-GB\/Phobos_animation_-_Image2_422-20081013-0000-6-mov-01-PhobosSeries.jpg\" alt=\"\"><\/figure>\n<p>N\u00e6rbilder viser at Phobos, den st\u00f8rste m\u00e5nen, er en potetformet romstein som m\u00e5ler bare 27 km \u00d7 22 km \u00d7 19 km. Den er sv\u00e6rt m\u00f8rk \u2013 svartere enn kull \u2013 og full av kratere. Ved n\u00f8ye \u00e5 f\u00f8lge hvordan Phobos p\u00e5virker Mars Express under hver forbiflyging, har forskerne funnet ut at m\u00e5nen ikke har s\u00e6rlig h\u00f8y tetthet. Den er nesten helt sikkert en \u2018steinhaug\u2019 \u2013 best\u00e5ende av mange steinbiter som holdes sammen av tyngdekraften \u2013 snarere enn et enkelt, solid objekt.<\/p>\n<p>Forskning fra Mars Express tyder p\u00e5 at Phobos og Deimos en gang kan ha v\u00e6rt asteroider som kretset rundt Solen mellom Mars og Jupiter. Imidlertid er det forel\u00f8pig ingen som kan forklare hvordan de ble fanget inn av Mars og endte opp i \u2018normale\u2019 baner over planetens ekvator.<\/p>","protected":false},"excerpt":{"rendered":"<p>In 1877, the American astronomer Asaph Hall discovered two small moons circling the planet Mars. They were named Phobos (Fear) and Deimos (Panic). More than 130 years later, scientists are [&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\/2008\/10\/mars_moon_phobos2\/17879181-2-eng-GB\/Mars_moon_Phobos.jpg","esa_banner_description":"Mars\u2019 moon Phobos","esa_banner_credit":"ESA\/ DLR\/ FU Berlin (G. 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