英语翻译Astronomershavewitnessedthebiggestbangsincethebigbang—themomentabout15billionyearsagowhentheuniversewascreatedinamassiveexplosion.Thehugeburstofenergyfromtheedgeoftheuniverseisestimatedtobesecondo
英语翻译
Astronomershavewitnessedthebiggestbangsincethebigbang—themomentabout15billionyearsagowhentheuniversewascreatedinamassiveexplosion.Thehugeburstofenergyfromtheedgeoftheuniverseisestimatedtobesecondonlytothemomentofcreationinitsexplosiveforce,releasingmoreenergyintwosecondsthanthesunwillgiveoutinitlifetime.Scientistshopetheexplosion—knownasagamma-rayburstbecauseitemitsenergyintheformofgammaradiation—willshedlightontheearlieststagesintheevolutionofthestarsandgalaxies.Gamma-rayburstscannotbeseenbythehumaneye,butiftheycouldtheskywouldlightuplikeacameraflasheachtimetheyoccurred.Theyarebyfarthemostenergeticeventsintheuniverseand,untilnow,haveremainedlargelyamystery.
Thelatestgamma-raybursttobedetectedaccuratelyoccurredlastDecember.Usinganetworkoftelescopesandsatellites,theastronomerswereabletocalculateitsdistancefromEarthatabout15billionlightyears.Thismeansitmusthavehappenedsoonafterthebigbangitself,whiletheintensityoftheradiationrevealedittobethebiggestbangrecordedbyman.ScientistsfromtheAmericanNationalAeronauticsandSpaceAdministrationandtheCaliforniaInstituteofTechnologyaretoannouncedetailsoftheiranalysisthisweek.ThehugedistancebetweenthesourceoftheexplosionandtheEarthsuggestsgamma-rayburstsareupto10timeslargerthanpreviouslythought,saidJonathanKatz,professorofphysicsatWashingtonUniversityinStLouis.
“Gamma-rayburstsmaybethemostdistantthingswewilleverseeandassuchwillactasbeaconstoprobeintotheverydistantregionsoftheuniversewhenstarsandgalaxieswerefirstformed.”
AmericanspysatelliteslookingfortheradiationreleasedfromSovietnucleartestsfirstdetectedgamma-rayburstsin1967butthedetailswerekeptclassifieduntil1973.Fornearly25yearsscientistswerehamperedintheireffortstofindanexplanationforthehugeexplosionsbecausetheylastednolongerthanafewseconds.Theinabilitytoexplainthemledtospeculationthatgamma-rayburstsweretheremnantsofnuclearbattlesbetweenaliencivilizations,oreventheexhaustenergyofextraterrestrialspaceshipsgoingintowarpdrive.Twosatellite
