【英语翻译Whenmanbegantosearchtheskies,hesawalotofthings.Intheuniverse(宇宙),theearthseemedtobejustabitofdust.Itisonlyasmallplanet,andtravelsaroundthesun.Thesuntogetherwithitsplanets,travelsintheMilkyWay(】

　　英语翻译

　　Whenmanbegantosearchtheskies,hesawalotofthings.Intheuniverse(宇宙),theearthseemedtobejustabitofdust.Itisonlyasmallplanet,andtravelsaroundthesun.Thesuntogetherwithitsplanets,travelsintheMilkyWay(银河),ourgalaxy(星系).TheMilkyWayhasaboutthirtybillionstarslikeoursun,andisoneofaboutahundredmilliongalaxiesintheuniverse.

　　Becausethespace(空间)issogreat,itisdifficulttoworkouthowfarawayastaris.Insteadofkilometres,wehavelight-years.Alight-yearmeanshowfarlighttravelsinoneyear.Ournearestneighbourgalaxyismorethan9,000,000light-yearsawayfromtheearth.