{"id":1140,"date":"2004-11-19T09:43:00","date_gmt":"2004-11-19T08:43:00","guid":{"rendered":"https:\/\/kids.esa.int\/sailing_through_space\/"},"modified":"2026-10-09T11:30:53","modified_gmt":"2026-10-09T09:30:53","slug":"sailing_through_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/sailing_through_space\/","title":{"rendered":"At sejle gennem rummet"},"content":{"rendered":"
\n

Indtil nu har n\u00e6sten alle rummissioner anvendt raketmotorer, der drives af kemisk br\u00e6ndstof. Desv\u00e6rre er disse ikke s\u00e6rlig effektive. For eksempel udgjorde br\u00e6ndstoffet over halvdelen af opsendelsesv\u00e6gten for ESA\u2019s rumfart\u00f8j Rosetta.<\/p>\n<\/div>\n

ESA unders\u00f8ger i \u00f8jeblikket mulighederne for at reducere den m\u00e6ngde br\u00e6ndstof, der medbringes. En af id\u00e9erne er en ionmotor, der bruger en elektrisk \u2018kanon\u2019 til at skyde gas ud i rummet.<\/p>\n

Selvom motorens fremdrift er meget svag, \u00f8ger den gradvist hastigheden. Til sidst g\u00f8r den det muligt for et rumfart\u00f8j at bev\u00e6ge sig meget hurtigt.<\/p>\n

\"Artist's
Kunstnerisk fremstilling af SMART-1<\/figcaption><\/figure>\n

SMART-1 gennemf\u00f8rte en vellykket test af en ionmotor p\u00e5 vej mod M\u00e5nen. Motoren genererede 10 gange st\u00f8rre fremdrift end en almindelig raketmotor for hvert kilo br\u00e6ndstof, den forbrugte.<\/p>\n

ESA unders\u00f8ger ogs\u00e5 rumfart\u00f8jer, der bruger solsejl i stedet for motorer. Sollys, der rammer et stort, spejllignende sejl, vil kunne skubbe et rumfart\u00f8j i retning af andre planeter. Efter mange m\u00e5neder vil et s\u00e5dant rumfart\u00f8j kunne n\u00e5 en hastighed p\u00e5 360 000 km\/t.<\/p>\n

En anden m\u00e5de at spare br\u00e6ndstof og v\u00e6gt p\u00e5 er at s\u00e6nke farten ved at flyve gennem en planets \u00f8vre atmosf\u00e6re. ESA planl\u00e6gger at bygge et rumfart\u00f8j, der skal g\u00e5 i kredsl\u00f8b om Mars ved hj\u00e6lp af denne \u2018aerocapture\u2019-metode.<\/p>","protected":false},"excerpt":{"rendered":"

Until now, nearly all space missions have used rocket motors that feed on chemical fuel. Unfortunately, these are not very efficient. For example, over half the launch weight of ESA’s […]<\/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\/04\/close-up_view_of_smart-1_s_stationary_plasma_thruster2\/17900310-2-eng-GB\/Close-up_view_of_SMART-1_s_stationary_plasma_thruster.jpg","esa_banner_description":"Close-up view of SMART-1's stationary plasma thruster","esa_banner_credit":"ESA 2002. Illustration by Medialab.","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Close-up_view_of_SMART-1_s_stationary_plasma_thruster2","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":[10,44,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1140","post","type-post","status-publish","format-standard","hentry","category-learn","category-spacecraft","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1140","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=1140"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1140\/revisions"}],"predecessor-version":[{"id":4867,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1140\/revisions\/4867"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=1140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=1140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=1140"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=1140"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=1140"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=1140"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=1140"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=1140"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=1140"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=1140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}