{"id":176643,"date":"2026-05-13T05:47:10","date_gmt":"2026-05-13T05:47:10","guid":{"rendered":"https:\/\/www.europesays.com\/ee\/176643\/"},"modified":"2026-05-13T05:47:10","modified_gmt":"2026-05-13T05:47:10","slug":"maast-vahegi-vaiksemailt-planeetidelt-ei-ole-suuremat-lootust-elu-leida-universum","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ee\/176643\/","title":{"rendered":"Maast v\u00e4hegi v\u00e4iksemailt planeetidelt ei ole suuremat lootust elu leida | Universum"},"content":{"rendered":"

Kui suur peab planeet olema, et selle peal v\u00f5iks loota elu teket ja p\u00fcsi?<\/p>\n

Arvatavasti on elu tekkeks ja p\u00fcsimaj\u00e4\u00e4miseks soodne, kui planeeti \u00fcmbritseb atmosf\u00e4\u00e4r. Atmosf\u00e4\u00e4r kaitseb esimesi \u00f5rnakesi elusolendeid t\u00e4helt tulvava ultraviolettkiirguse eest.<\/p>\n

Ameerika teadlased on n\u00fc\u00fcd teema \u00fcle p\u00f5hjalikult j\u00e4rele m\u00f5elnud ja j\u00f5udnud j\u00e4reldusele, et k\u00f5ige v\u00e4iksem planeet, mis v\u00f5iks atmosf\u00e4\u00e4ri poolest eluks sobilik olla, on ainult natuke Maakerast v\u00e4iksem.<\/p>\n

Mida v\u00e4iksem on planeet, seda v\u00e4iksemad on tal paratamatult ka mass ja k\u00fclget\u00f5mbej\u00f5ud, mist\u00f5ttu on v\u00e4iksem ka niinimetatud paokiirus, mis v\u00f5imaldab planeedi juurest lahkuda.<\/p>\n

See aga t\u00e4hendab, et suure energiaga atmosf\u00e4\u00e4riosakesed pagevad planeedilt avakosmosse selle v\u00f5rra suurema t\u00f5en\u00e4osusega.<\/p>\n

Kuid on veel \u00fcks asjaolu, mis v\u00e4iksemail planeetidel atmosf\u00e4\u00e4ril h\u00e4sti p\u00fcsida ei lase. V\u00e4iksemail planeetidel on pindala ja ruumala suhe nimelt suurem kui suurematel planeetidel.<\/p>\n

Seet\u00f5ttu jahtub nende sisemus kiiremini kui suuremate planeetide sisemus. Ja seet\u00f5ttu v\u00e4heneb ka planeedi vulkaaniline aktiivsus.<\/p>\n

<\/p>\n

Kui aga vulkaanid kustuvad, ei aita vulkaanidest erituvad gaasid enam atmosf\u00e4\u00e4ri alal hoida, mist\u00f5ttu v\u00f5ib atmosf\u00e4\u00e4r peagi kaduda.<\/p>\n

Michelle Hill Stanfordi \u00dclikoolist ja ta kolleegid kirjutavad v\u00f5rguvaramusse arXiv<\/a> \u00fcles pandud artiklis, et nende koostatud arvutimudelis ilmnes v\u00e4ga selge piir 0,7 ja 0,8 Maa l\u00e4bim\u00f5\u00f5duga planeetide vahel.<\/p>\n

Kui planeedi l\u00e4bim\u00f5\u00f5t on suurem kui 0,8 Maa l\u00e4bim\u00f5\u00f5tu, siis p\u00fcsib atmosf\u00e4\u00e4r ta \u00fcmber t\u00f5en\u00e4oliselt miljardeid aastaid. Kui aga l\u00e4bim\u00f5\u00f5t j\u00e4\u00e4b alla 0,7 Maa l\u00e4bim\u00f5\u00f5du, siis kaob atmosf\u00e4\u00e4r emat\u00e4helt saabuva ultraviolettkiirguse toimel pigem varem kui hiljem.<\/p>\n

N\u00e4iteks 0,6 Maa l\u00e4bim\u00f5\u00f5duga planeet suudaks atmosf\u00e4\u00e4ri hoida keskeltl\u00e4bi umbes 400 miljonit aastat, poole Maa l\u00e4bim\u00f5\u00f5duga planeet j\u00e4\u00e4ks atmosf\u00e4\u00e4rist lagedaks aga k\u00f5igest 30 miljoni aastaga.<\/p>\n

Nii l\u00fchikeste ajavahemike jooksul ei saaks elu arvatavasti veel nii tugevalt juurduda, et suudaks atmosf\u00e4\u00e4ri kadudes p\u00fcsima j\u00e4\u00e4da.<\/p>\n

Hill ja ta kaaslased tunnistavad, et teatud erakordsete olude korral v\u00f5ib atmosf\u00e4\u00e4r ka v\u00e4iksemate planeetide \u00fcmber pikemaks ajaks alles j\u00e4\u00e4da. Kuid need erakordsed olud on v\u00e4ga haruldased.<\/p>\n

Praktiline j\u00e4reldus on see, et kui soovime leida maav\u00e4lise elu m\u00e4rke, siis tasub neid otsida planeetidelt, mille l\u00e4bim\u00f5\u00f5t on suurem kui 0,8 Maa l\u00e4bim\u00f5\u00f5tu.<\/p>\n

Teadusuudised on Vikerraadios eetris esmasp\u00e4evast reedeni ca kell 8.35 ja laup\u00e4eval ca kell 8.25.<\/p>\n","protected":false},"excerpt":{"rendered":"Kui suur peab planeet olema, et selle peal v\u00f5iks loota elu teket ja p\u00fcsi? Arvatavasti on elu tekkeks…\n","protected":false},"author":2,"featured_media":176644,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[12],"tags":[26,27,37,33,35,79693,59800,34,36,31,32,21,28,29,19,25,23,24,22,20,30,79694],"class_list":["post-176643","post","type-post","status-publish","format-standard","has-post-thumbnail","category-eesti","tag-breaking-news","tag-breakingnews","tag-ee","tag-eesti","tag-eesti-keel","tag-eksoplaneet","tag-elu-teke","tag-estonia","tag-estonian","tag-featured-news","tag-featurednews","tag-headlines","tag-latest-news","tag-latestnews","tag-news","tag-populaarseimad-lood","tag-top-stories","tag-topstories","tag-uldised-uudised","tag-uudised","tag-viimased-uudised","tag-vulkaan"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ee\/116565694738513054","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/176643","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/comments?post=176643"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/176643\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media\/176644"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media?parent=176643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/categories?post=176643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/tags?post=176643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}