宇宙英文PPT课件

1、.,1,TheUniverse,.,2,Scientistsbelievethatabout13.7billionyearsago,apowerfulexplosioncalledtheBigBanghappened.Thispowerfulexplosionsettheuniverseintomotionandthismotioncontinuestoday.Scientistsarenotyetsureifthemotionwillstop,changedirection,orkeepgoingforever.,.,3,Theuniverseisahugewide-openspacetha

2、tholdseverythingfromthesmallestparticletothebiggestgalaxy(星系).NooneknowsjusthowbigtheUniverseis.,.,4,Galaxies,isthestarsintheuniverse“island”,itisoneofthelargestandmostbeautifulcelestialsystem（天体系统)intheuniverse.Todate,about100billiongalaxieshavebeenobservedintheuniverse.Someofthemwehaveclose,someve

3、ryfaraway,thefurthestgalaxyknowntodayalmost15billionlightyearsawayfromus.,.,5,TheMilkyWayGalaxyistheGalaxystarsystemwherethesolarsystem,including120billionstarsandplentyofstarclusters(星团),Itsmorethan100,000lightyearsindiameter（直径）,Centerthicknessofabout12,000lightyears.,.,6,solarsystem,Thereareeight

4、planetsinoursolarsystem.TheyreMercury,Venus,Earth,Mars,Jupiter,Saturn,UranusandNeptune.,.,7,AndtheEarthisourhome.WerelivingontheEarth,anditisthemostbeautifulinthesolarsystem.Ithaslotsofwaterandplants.AndthemoonistheEarthspartner.ItgoesaroundtheEarth.AndotherplanetsareveryfarfromtheEarth.Sothepeoplecantreachthemandnoneofthemhasanenvironmentwithair.Thepeoplealsocantliveinthem.,.,8,Thereismuchbeautifulandmagicviewintheuniverse.,.