英语翻译Thousandsofpeoplearoundtheglobestepoutsidetogazeattheirnightsky.Onaclearnight,withnoclouds,moonlight,orartificiallightstoblocktheview,peoplecanseemorethan14,000starsinthesky,saysDennisWard,anastronomer

　　英语翻译

　　Thousandsofpeoplearoundtheglobestepoutsidetogazeattheirnightsky.Onaclearnight,withnoclouds,moonlight,orartificiallightstoblocktheview,peoplecanseemorethan14,000starsinthesky,saysDennisWard,anastronomerwiththeUniversityCorporationforAtmosphericResearch(UCAR)inBoulder,Colo1.Butwhenpeoplearesurroundedbycitylights,hesays,they'reluckytosee150stars.

　　Ifyou'veeverdriventowardabigcityatnightandseenitsglowfromagreatdistance,you'vewitnessedlightpollution.Itoccurswhenlightfromstreetlights,officebuildings,signs,andothersourcesstreamsintospaceandilluminatesthenightsky.ThishazeoflightmakesmanystarsinvisibletopeopleonEarth.Evenatnight,bigcitieslikeNewYorkglowfromlightpollution,makingstargazing2difficult.

　　Dustandparticlesofpollutionfromfactoriesandindustriesworsentheeffectsoflightpollution."Ifonecityhasalotmorelightpollutionthananother,"Wardsays,"thatcitywillsuffertheeffectsoflightpollutiononamuchgreaterscale."

　　Hazyskiesalsomakeitfarmoredifficultforastronomerstodotheirjobs.

　　Citiesaregettinglarger.Suburbsaregrowinginoncedark,ruralareas.Lightfromallthisnewdevelopmentisincreasinglyobscuringthefaintlightgivenoffbydistantstars.Andifscientistscan'tlocatetheseobjects,theycan'tlearnmoreaboutthem.

　　Lightpollutiondoesn'tonlyaffectstarvisibility.Itcanharmwildlifetoo.It'sclearthatartificiallightcanattractanimals,makingthemgooffcourse3.There'sincreasingevidence,forexample,thatmigratingbirdsusesunsetsandsunrisestohelpfindtheirway,saysSydneyGauthreauxJr.,ascientistatClemsonUniversityinSouthCarolina."Whenlightoccursatnight,"hesays,"ithasaverydisruptiveinfluence."Sometimesbirdsflyintolightedtowers,high-rises,andcablesfromradioandtelevisiontowers.Expertsestimatethatmillionsofbirdsdiethiswayeveryyear.