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                          腾讯1.5分彩计划2期

                          2019-05-11 19:03:40 来源:互动百科

                          Life could be evolving on nearest exoplanets with high radiation: study#标题分割#Astudyshowedthatrocky,Earth-likeplanetsinthehabitablezoneofsomeofourcloseststarscouldhostlife.ThestudypublishedonTuesdayintheMonthlyNoticesoftheRoyalAstronomicalSocietyshowedthatlifecouldsurvivethehighlevelsofradiationbombardingthoseworlds.ResearchersfromCornellUniversityfoundthatalloflifeonEarthtodayevolvedfromcreaturesthatthrivedduringanevengreaterultravioletradiationassaultthannearbyexoplanetslikeProxima-bwhichreceives250timesmoreX-rayradiationthanEarth.Previously,thefierceradiationdashedpeople'shopesthatnearbyexoplanetsmayhavelife.TheEarth4billionyearsagowasachaotic,irradiated,hotmess,notunlikewhatishappeningonsomeofthenearestexoplanets.Yetinspiteofthis,lifesomehowgainedatoeholdandthenexpanded,accordingtothestudy.TheresearchersmodeledthesurfaceultravioletenvironmentsofthefourexoplanetsclosesttoEarththatarepotentiallyhabitableincludingProxima-b.Thoseplanetsorbitsmallreddwarfstarswhich,unlikeoursun,flarefrequently,bathingtheirplanetsinhigh-energyradiation.Highlevelsofradiationcausebiologicalmoleculeslikenucleicacidstomutateorevenshutdown.Althoughmodeledplanetsreceivehigherultravioletradiationthanthatemittedbyourownsuntoday,itissignificantlylowerthanwhatEarthreceived3.9billionyearsago,accordingtothestudy."WeshowthatultravioletradiationshouldnotbealimitingfactorforthehabitabilityofplanetsorbitingMstars.Ourclosestneighboringworldsremainintriguingtargetsforthesearchforlifebeyondoursolarsystem,"accordingtotheresearchers.

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