{"id":14549,"date":"2010-10-01T08:54:11","date_gmt":"2010-10-01T05:54:11","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=14549"},"modified":"2010-10-01T08:58:30","modified_gmt":"2010-10-01T05:58:30","slug":"stirea-cu-exoplaneta-gliese-581g-unde-ar-putea-locui-extraterestri-un-mare-fas","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/stirea-cu-exoplaneta-gliese-581g-unde-ar-putea-locui-extraterestri-un-mare-fas\/","title":{"rendered":"\u015etirea cu exoplaneta Gliese 581g unde ar putea locui extratere\u015ftri…un mare f\u00e2s"},"content":{"rendered":"

\"Gliese<\/a>Mul\u0163i dintre noi au auzit de aceast\u0103 \u015ftire, ce a f\u0103cut \u00eenconjorul lumii:<\/p>\n

Astronomii americani au descoperit o exoplanet\u0103 cu dimensiune apropiat\u0103 de a P\u0103m\u00e2ntului \u015fi care ar prezenta condi\u0163ii pentru a sus\u0163ine via\u0163a, potrivit France Presse. Botezat\u0103 Gliese 581g, exoplaneta are o temperatur\u0103 care permite p\u0103strarea apei \u00een stare lichid\u0103 la suprafa\u0163a scoar\u0163ei sau \u00een apropiere de aceasta, au explicat cercet\u0103torii. O exoplanet\u0103 este o planet\u0103 care orbiteaz\u0103 \u00een jurul unei stele, alta dec\u00e2t Soarele, arat\u0103 AFP.<\/p>\n

Dac\u0103 descoperirea oamenilor de \u015ftiin\u0163\u0103 va fi confirmat\u0103 prin alte m\u0103sur\u0103tori, Gliese 581g ar fi cea mai asem\u0103n\u0103toare cu planeta pe care tr\u0103im, dintre toate exoplanetele descoperite p\u00e2n\u0103 \u00een prezent. Steaua sa, Gliese 581, se afl\u0103 \u00een galaxia noastr\u0103, Calea Lactee, la aproximativ 20 de ani-lumin\u0103 de P\u0103m\u00e2nt.<\/p>\n

„Faptul c\u0103 am putut descoperi aceast\u0103 planet\u0103 at\u00e2t de repede \u015fi aproape de sistemul nostru solar demonstreaz\u0103 c\u0103 astfel de exoplanete ar fi numeroase”, a declarat Steven Vogt, profesor de astronomie \u015fi astrofizic\u0103 la Universitatea California din Santa Cruz \u015fi unul dintre coautorii studiului.<\/p>\n

Gliese 581g are o mas\u0103 de 3,1 p\u00e2n\u0103 la 4,3 ori mai mare dec\u00e2t cea a Terrei, iar raza sa este de 1,2 – 1,5 ori mai mare ca a planetei noastre, a ar\u0103tat Paul Buttler, de la Departamentul pentru Magnetism Terestru al Carnegie Institution din Washington.<\/p>\n

Gliese 581g pare s\u0103 fie o planet\u0103 st\u00e2ncoas\u0103, cu o gravita\u0163ie la suprafa\u0163a scoar\u0163ei asemenea P\u0103m\u00e2ntului \u015fi care orbiteaz\u0103 steaua \u00een 36,6 de zile.<\/p>\n

Potrivit astronomilor, o exoplanet\u0103 este „poten\u0163ial locuibil\u0103” c\u00e2nd permite existen\u0163a vie\u0163ii. Cu toate acestea, nu \u00eenseamn\u0103 c\u0103 oamenii ar putea locui aici. Printre cele mai importante caracteristici care ar face o planet\u0103 locuibil\u0103 se num\u0103r\u0103 prezen\u0163a apei \u00een stare lichid\u0103 \u015fi a unei atmosfere, au mai explicat oamenii de \u015ftiin\u0163\u0103.<\/p>\n

Din primele estim\u0103ri f\u0103cute de ace\u015ftia, temperatura care se \u00eenregistreaz\u0103 la suprafa\u0163a Gliese 581g, care nu este expus\u0103 \u00een permanen\u0163\u0103 stelei sale \u015fi nici \u00eentunericului din spa\u0163iu, variaz\u0103 \u00eentre -31 de grade Celsius \u015fi -12 grade Celsius.<\/p>\n

Exoplaneta Gliese 581g a fost descoperit\u0103 dup\u0103 11 ani de observa\u0163ii cu telescopul observatorului spa\u0163ial Keck din Hawaii, situat la 4.145 de metri altitudine.<\/p>\n

Sursa: <\/em>Evenimentul Zilei<\/a><\/strong><\/p>\n

Comentariu „Secretele lui Lovendal”: <\/strong><\/p>\n

\u00cen primul r\u00e2nd, poate c\u0103 nu v\u0103 mai aduce\u0163i aminte, dar \u015ftirea cu „planeta locuibil\u0103” nu e nou\u0103. Acum 1 an \u015fi jum\u0103tate, s-a mai anun\u0163at descoperirea a dou\u0103 planete „Gliese 581 e” (care seam\u0103n\u0103 izbitor de mult cu P\u0103m\u00e2ntul) \u015fi „Gliese 581 d” (ce orbiteaz\u0103 \u00eentr-o zon\u0103 locuibil\u0103, unde sunt \u015fanse foarte mari ca apa s\u0103 existe sub form\u0103 lichid\u0103). Vezi toat\u0103 \u015ftirea original\u0103, de pe 24 aprilie 2009, aici: https:\/\/www.lovendal.ro\/wp52\/o-planeta-din-afara-sistemului-solar-ce-seamana-incredibil-de-mult-cu-pamantul\/<\/strong><\/a><\/p>\n

\u00cen al doilea r\u00e2nd, s\u0103 clarific\u0103m c\u00e2teva lucruri, \u00eenainte de a v\u0103 entuziasma, a\u015fa cum fac mul\u0163i: „Uau! S-a descoperit o planet\u0103 unde locuiesc extratere\u015ftrii!”<\/em><\/p>\n

Dac\u0103 o planet\u0103 se afl\u0103 prea aproape de o stea, ea e prea fierbinte pentru a putea favoriza apa lichid\u0103. Dac\u0103 e situat\u0103 prea departe, ea \u00eenghea\u0163\u0103. Aceste dou\u0103 extreme define\u015fte o „zon\u0103 de aur” („Goldilocks Zone” \u00een limba englez\u0103) \u00een care apa lichid\u0103 poate exista la suprafa\u0163a planetei. Nu conteaz\u0103 doar distan\u0163a fa\u0163\u0103 de stea, ci \u015fi al\u0163i factori, ca de exemplu atmosfera planetei. Venus ar putea avea ap\u0103 lichid\u0103, dar atmosfera sa foarte groas\u0103 produce un efect de ser\u0103, prin care apa s-a evaporat, datorit\u0103 temperaturilor extrem de \u00eenalte (460\u00b0 C). \u015ei Marte ar fi putut avea o atmosfera groas\u0103, \u015fi atunci apa lichid\u0103 ar fi putut exista pe suprafa\u0163a planetei, compens\u00e2nd astfel distan\u0163a mai mare fa\u0163\u0103 de Soare. A\u015fadar, conteaz\u0103 mult \u015fi atmosfera planetei.<\/p>\n

Gliese 581g, noua planet\u0103 descoperit\u0103, se afl\u0103 \u00eentr-o zon\u0103 \u00een care temperatura este potrivit\u0103. \u015ei, av\u00e2nd o mas\u0103 de doar trei ori mai mare ca P\u0103m\u00e2ntul, este pu\u0163in probabil ca ea s\u0103 fie un gigant gazos (a\u015fa cum este Jupiter). Totu\u015fi, acest lucru nu \u00eenseamn\u0103 ca planet\u0103 s\u0103 fie locuibil\u0103, sau chiar foarte asem\u0103n\u0103toare cu P\u0103m\u00e2ntul. S-ar putea ca nici m\u0103car s\u0103 nu aib\u0103 ap\u0103 pe ea.<\/p>\n

Tot din \u015ftirea de mai sus, afl\u0103m c\u0103 perioada de orbitare a planetei este de 37 de zile, ceea ce o pune destul de aproape de stea, dar, din moment ce Gliese este o pitic\u0103 ro\u015fie, ea este mai rece dec\u00e2t Soarele, a\u015fa c\u0103 n-ar fi o problem\u0103 c\u0103 planeta Gliese 581g se afl\u0103 mai aproape fa\u0163\u0103 de steaua ei. Dar, aceast\u0103 apropiere mai \u00eenseamn\u0103 faptul c\u0103 steaua exercit\u0103 o for\u0163\u0103 de atrac\u0163ie puternic\u0103 asupra planetei, ceea ce are ca efect \u00eencetinirea rota\u0163iei planetei p\u00e2n\u0103 c\u00e2nd va egala perioada orbital\u0103. Cu alte cuvinte, o zi pe aceast\u0103 planet\u0103 e echivalent\u0103 cu un an, iar planeta \u00eentotdeauna arat\u0103 aceea\u015fi fa\u0163\u0103 stelei sale, a\u015fa cum face Luna fa\u0163\u0103 de P\u0103m\u00e2nt. Acest lucru face ca planeta s\u0103 fie pu\u0163in mai probabil locuibil\u0103, dintr-un motiv foarte simplu: partea vizibil\u0103 c\u0103tre stea poate fi foarte fierbinte, \u00een timp ce partea \u00eentunecat\u0103 poate fi foarte rece.\u00a0 Doar dac\u0103 planeta ar avea o atmosfer\u0103, s-ar putea diminua aceste extreme (aerul cald de pe partea fierbinte s-ar putea duce c\u0103tre partea \u00eentunecat\u0103 \u015fi rece, \u015fi viceversa) \u015fi atunci, clima ar deveni ceva mai bl\u00e2nd\u0103. Dar totu\u015fi, nu exist\u0103 nicio dovad\u0103 precum c\u0103 pe aceast\u0103 planet\u0103 s-ar g\u0103si atmosfer\u0103.<\/p>\n

Mai vreau totu\u015fi s\u0103 atrag aten\u0163ia c\u0103 masa g\u0103sit\u0103 a planetei este de trei ori masa P\u0103m\u00e2ntului, \u015fi aceasta este doar valoarea minim\u0103. Poate fi o planet\u0103 extrem de masiv\u0103 (\u015fi atunci ar putea fi un gigant gazos, ce n-ar putea g\u0103zdui via\u0163a). Metoda Doppler (prin care se determin\u0103 masele exoplanetelor) nu poate oferi masa exact\u0103, ci doar valoarea minim\u0103.<\/p>\n

A\u015fadar, nu cred c\u0103 ar fi timpul s\u0103 ne entuziasm\u0103m prea tare precum c\u0103 am g\u0103sit o planet\u0103, unde ar putea g\u0103zdui extratere\u015ftri…<\/p>\n

P.S. Ieri, 30 septemebrie 2010, se anun\u0163a la Antena 3 precum c\u0103 aceast\u0103 planet\u0103 s-ar afla la 20 de milioane ani-lumin\u0103 fa\u0163\u0103 de P\u0103m\u00e2nt! S\u0103-mi spun\u0103 \u015fi mie „speciali\u015ftii \u015ftirilor” de la Antena 3 cum naiba po\u0163i vedea cu telescopul o planet\u0103 situat\u0103 la o distan\u0163\u0103 at\u00e2t de uria\u015f\u0103…M\u0103 ab\u0163in de la orice comentarii…<\/p>\n","protected":false},"excerpt":{"rendered":"

Mul\u0163i dintre noi au auzit de aceast\u0103 \u015ftire, ce a f\u0103cut \u00eenconjorul lumii: Astronomii americani au descoperit o exoplanet\u0103 cu dimensiune apropiat\u0103 de a P\u0103m\u00e2ntului \u015fi care ar prezenta condi\u0163ii pentru a sus\u0163ine via\u0163a, potrivit France Presse. Botezat\u0103 Gliese 581g, … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":14550,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[102,3460,51,3554,352,731,156,105,865,733,9803,434,1029],"class_list":["post-14549","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-astronomie","tag-exoplaneta","tag-extraterestri","tag-gliese","tag-hawaii","tag-jupiter","tag-marte","tag-pamant","tag-soare","tag-stea","tag-stiinta","tag-telescop","tag-venus","resize-featured-image"],"yoast_head":"\n\u015etirea cu exoplaneta Gliese 581g unde ar putea locui extratere\u015ftri...un mare f\u00e2s - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/stirea-cu-exoplaneta-gliese-581g-unde-ar-putea-locui-extraterestri-un-mare-fas\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u015etirea cu exoplaneta Gliese 581g unde ar putea locui extratere\u015ftri...un mare f\u00e2s\" \/>\n<meta property=\"og:description\" content=\"Mul\u0163i dintre noi au auzit de aceast\u0103 \u015ftire, ce a f\u0103cut \u00eenconjorul lumii: Astronomii americani au descoperit o exoplanet\u0103 cu dimensiune apropiat\u0103 de a P\u0103m\u00e2ntului \u015fi care ar prezenta condi\u0163ii pentru a sus\u0163ine via\u0163a, potrivit France Presse. 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Botezat\u0103 Gliese 581g, ... 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