{"id":1005,"date":"2004-11-15T13:50:00","date_gmt":"2004-11-15T12:50:00","guid":{"rendered":"https:\/\/kids.esa.int\/what_is_space\/"},"modified":"2026-10-08T00:34:45","modified_gmt":"2026-10-07T22:34:45","slug":"what_is_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/de\/what_is_space\/","title":{"rendered":"Was ist der Weltraum?"},"content":{"rendered":"<div class=\"lede\">\n<p>Im Weltraum kann euch niemand schreien h\u00f6ren. Warum? Weil es im Weltraum keine Luft gibt. Er ist ein luftleerer Raum. Schall kann sich nicht durch einen luftleeren Raum fortpflanzen.<\/p>\n<\/div>\n<p>\u2018Der \u2019Weltraum\u201c beginnt etwa 100 km \u00fcber der Erde, wo die Lufth\u00fclle um unseren Planeten endet. Da es keine Luft mehr gibt, die das Sonnenlicht streut und einen blauen Himmel erzeugt, erscheint der Weltraum wie eine schwarze Decke, die mit Sternen \u00fcbers\u00e4t ist.<\/p>\n<p>In der Regel sagt man, der Weltraum sei absolut leer. Das stimmt aber nicht. Die riesigen L\u00fccken zwischen den Sternen und den Planeten sind mit Unmengen von d\u00fcnn verteiltem Gas und Staub gef\u00fcllt. Sogar die leersten Stellen im Weltraum enthalten mindestens ein paar hundert Atome oder Molek\u00fcle pro Kubikmeter.<\/p>\n<p>Au\u00dferdem gibt es im Weltraum verschiedenste Arten von Strahlung, die f\u00fcr Astronauten eine Gefahr darstellen. Ein Gro\u00dfteil dieser Infrarot- und UV-Strahlung stammt von der Sonne. Sehr energiereiche R\u00f6ntgenstrahlen, Gammastrahlen sowie kosmische Strahlen (Teilchen, die sich fast mit Lichtgeschwindigkeit fortbewegen) kommen von Sternsystemen in weiter Ferne.<\/p>","protected":false},"excerpt":{"rendered":"<p>In space, no one can hear you scream. This is because there is no air in space \u2013 it is a vacuum. Sound waves cannot travel through a vacuum. &#8216;Outer [&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\/2004\/12\/earth_from_space2\/17871152-2-eng-GB\/Earth_from_space.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/Earth_from_space2","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":[10,11,19],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1005","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/posts\/1005","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/comments?post=1005"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/posts\/1005\/revisions"}],"predecessor-version":[{"id":2148,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/posts\/1005\/revisions\/2148"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/media?parent=1005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/categories?post=1005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/tags?post=1005"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/panel?post=1005"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/language?post=1005"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/age?post=1005"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/duration?post=1005"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/resource_type?post=1005"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/audience?post=1005"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/de\/wp-json\/wp\/v2\/wf_post_folders?post=1005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}