用英语介绍的太空知识一定要英语的哦~
Gazeupwardsonadarknight,andyouwillseethe'MilkyWay',aglowingribbonmadeupofmanyindividualstars.Thisisourfirstcluetothefactthatthatstarsarenotuniformlydistributedthroughoutspace,butclusteredtogethertoformgalaxies.
Galaxiescanvaryinsizebetweenahundredthousandandthreethousandbillionsolarmasses,andcanbebroadlysplitintodifferentclasses,dependingontheirshape.OurownMilkyWayGalaxycontainsabouttwohundredbillionstars.Itisaspiralshape,whichiswhy,whenviewedfromourpositionabouttwothirdsofthewayalongoneofthearms,itappearsasabandacrossthesky.
GazingoutintotheUniverserevealsthousandsuponthousandsofgalaxies.Thesegalaxiestendtobegroupedtogetherinclusters,andtheseclustersinturnaregroupedintosuperclusters.ItappearstheUniversehasstructureonmanydifferentscales.
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