{"id":439,"date":"2017-06-21T12:26:00","date_gmt":"2017-06-21T10:26:00","guid":{"rendered":"https:\/\/kids.esa.int\/evidence_found_that_comets_helped_to_make_earth_s_atmosphere\/"},"modified":"2026-10-08T00:28:13","modified_gmt":"2026-10-07T22:28:13","slug":"evidence_found_that_comets_helped_to_make_earth_s_atmosphere","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/evidence_found_that_comets_helped_to_make_earth_s_atmosphere\/","title":{"rendered":"Fynd tyder p\u00e5 att kometer bidrog till att bilda jordens atmosf\u00e4r!"},"content":{"rendered":"
\n

\u00c5r 2016 fullbordade ESA:s rymdsond Rosetta ett otroligt uppdrag: att flyga till en komet, studera den fr\u00e5n omloppsbana och skicka ner en robotlandare! Man fann d\u00e5 bevis f\u00f6r att kometer kraschade in i jorden f\u00f6r l\u00e4nge sedan och bidrog till att skapa v\u00e5r atmosf\u00e4r!<\/p>\n<\/div>\n

F\u00f6r att g\u00f6ra denna viktiga uppt\u00e4ckt var forskarna tvungna att agera som detektiver. Vi vet att jordens atmosf\u00e4r inneh\u00e5ller sm\u00e5 m\u00e4ngder av en gas som kallas xenon. Det finns m\u00e5nga olika typer av xenon i v\u00e5r atmosf\u00e4r, och varje typ bildas p\u00e5 ett n\u00e5got annorlunda s\u00e4tt. Detta ger ett slags \u201cfingeravtryck\u201d som kan anv\u00e4ndas f\u00f6r att skilja mellan olika blandningar av xenontyper.<\/p>\n

\"A
En n\u00e4rbild av kometen<\/figcaption><\/figure>\n

Forskare har uppt\u00e4ckt xenon i Mars tunna atmosf\u00e4r, i asteroider, p\u00e5 Jupiter och i partiklar fr\u00e5n solen. Men jordens xenon har ett annat \u201cfingeravtryck\u201d \u00e4n dessa! Det inneb\u00e4r att det xenon vi har h\u00e4r p\u00e5 jorden m\u00e5ste ha sitt ursprung n\u00e5gon annanstans \u00e4n det xenon som finns p\u00e5 andra platser i solsystemet.<\/p>\n

Xenonet p\u00e5 jorden \u00e4r mycket gammalt, och med tiden har sammans\u00e4ttningen f\u00f6r\u00e4ndrats. Forskarna anv\u00e4nde datormodeller f\u00f6r att f\u00f6ruts\u00e4ga hur xenonet p\u00e5 jorden skulle ha sett ut f\u00f6r omkring fyra och en halv miljard \u00e5r sedan, n\u00e4r v\u00e5r planet bildades. Detta leder oss tillbaka till ESA:s rymdsond Rosetta. N\u00e4r den unders\u00f6kte kometen, gissa vad den uppt\u00e4ckte? Xenon med n\u00e4stan samma \u201cfingeravtryck\u201d som xenonet p\u00e5 den forntida jorden!<\/p>\n

\"Comets
Kometer kan ha bidragit till att bilda jordens atmosf\u00e4r f\u00f6r miljarder \u00e5r sedan<\/figcaption><\/figure>\n

Detta \u00e4r ett starkt bevis p\u00e5 att kometer f\u00f6r l\u00e4nge sedan kolliderade med jorden och f\u00f6rde med sig xenon. Men \u00e4ven om kometernas xenon liknar det som fanns p\u00e5 den tidiga jorden \u00e4r det inte exakt detsamma. De bevis som Rosetta har hittat tyder faktiskt p\u00e5 att kometer bidrog med cirka 22% till jordens forntida xenon, medan resten troligen kom fr\u00e5n asteroider.<\/p>\n

Och om kometer f\u00f6rde med sig xenon, skulle de d\u00e5 ha kunnat f\u00f6ra med sig andra saker ocks\u00e5? Kanske f\u00f6rde kometer med sig aminosyror \u2013 en av livets byggstenar!<\/p>\n

\"Have
Har du sett v\u00e5ra serier om Rosetta?<\/figcaption><\/figure>\n

Tack vare de data som ESA:s rymdsond Rosetta har skickat tillbaka kommer vi allt n\u00e4rmare svaren p\u00e5 alla dessa fr\u00e5gor \u2013 och \u00e4nnu fler!<\/p>\n

Rolig fakta:<\/b> Det officiella namnet p\u00e5 den komet som Rosetta unders\u00f6kte \u00e4r 67P\/Churyumov-Gerasimenko. Rosetta fl\u00f6g otroligt n\u00e4ra kometen f\u00f6r att samla in xenon \u2013 bara 5 km ovanf\u00f6r dess yta!<\/p>","protected":false},"excerpt":{"rendered":"

In 2016, an ESA probe called Rosetta completed an incredible mission: flying to a comet, studying it from orbit, and sending down a robotic lander! They then found evidence that […]<\/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\/2017\/06\/rosetta_at_comet\/17873224-2-eng-GB\/Rosetta_at_Comet.jpg","esa_banner_description":"Rosetta and its lander have made amazing discoveries","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/06\/Rosetta_at_Comet","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-439","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=439"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/439\/revisions"}],"predecessor-version":[{"id":4475,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/439\/revisions\/4475"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=439"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=439"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=439"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=439"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=439"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=439"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=439"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}