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.