英语翻译ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaven'tfoundlifeonotherplanetsyet.Whynot?TheEarthisaplanetanditgoesaroundtheSun.EightotherplanetsalsogoaroundtheSun.Noneofthemh

　　英语翻译

　　ScientiststhinkthattherehasbeenlifeonEarthformillionsofyears.However,wehaven'tfoundlifeonotherplanetsyet.Whynot?

　　TheEarthisaplanetanditgoesaroundtheSun.EightotherplanetsalsogoaroundtheSun.Noneofthemhasanenvironmentwithair,sopeopleandthingscannotgrow.TheSunanditsplanetsarecalledthesolarsystemThesolarsystemisasmallparofourgalaxy.

　　Butscientistshavediscoveredmanyothergalaxiesintheuniverse.Theyarealongwayawayandtheirlighthastravelledformanyyearstoreachus.Itishardtounderstandhowlargetheuniverseis.

　　Scientistshavesentloteofspacecrafttolookatotherplanetsinoursolarsystem,andsomespacrafthavegonebeyondthesolarsystem.However,moomehasdiscoveredanylifeinspaceyet.

　　Butwhyhasnoonefromotherplanetssentusamessage?Havetheytriedtosendinformationtous?Withsomanystarsintheuniverse,arewealone,oristherelifeoutthereinspace?Wedon'tknow...yet.