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1、科普英语TheUniverseisdefinedaseverythingthatphysicallyexists:theentiretyofspaceandtime,allformsofmatter,energyandmomentum,andthephysicallawsandconstantsthatgovernthem.However,thetermUniversemaybeusedinslightlydifferentcontextualsenses,denotingsuchconceptsasthecosmos,theworldorNature.NeptuneUranusSatur
2、nMercuryJupiterMarsVenusEarthPlanet行星是组成宇宙的最基本系统.太阳系中共有八大行星,行星都有卫星绕其运转,地球有一个卫星:月球,有证据表明,太阳系外也存在其他行星系统.Planetary。syTshteermeaisretheeimosuniverse.Planegtshthpatlabnaestiscionfthesolarsystemvethesatellite,asatelliteMoon,therearoftheEarth:theoursolarseotherplanetsoutsideystem.Stars恒星就是像太阳一样本身能发光发热的星球
3、.我们银河系StarsliketheSu内就有1000多亿颗恒星.如果nis成千上万颗星聚在一起,形成itselfabletoemitlight一团星,这就是星团.银河系andheattheplanet.We里就发现1000多个这样的星团.havemorethan100billionstarswithintheMilkyWayGalaxy.Ifeventhousandsofstarstogethertoforma（s星tar,thisisthecluster团）.Theyfoundthatmorethan1000suchclustersintheMGalax.ilkyWayy太阳系就是我们
4、现在所在的恒星SolarSystemi系统.它是以太thessthatwearetarsino阳为中心,8颗行ursolarsystemItiscentere.星，至少165颗已dontheSun,a知的卫星,和数以8Planetatleast1nd65know亿计的太阳系小moons,andbillionsofn天体.systemsmallbody.solarSolarSystemTheMilkyWayTheMilkyWayGalaxyistheGalaxystarsystemwherethesolarsystem,including120billionstarsandplentyofs
5、tarclusters,Itsmorethan（10直0,径00）0,lightyearsindiameterCenterthicknessofabout12,000lightyears.银河系是太阳系所在的恒星系统,包括一千二百亿颗恒星和大量的星团、星云.它的直径约为100,000多光年,中心厚度约为12,000光年星系,是宇宙中庞大的星星的"岛屿",它也是宇宙中最大、最美丽的天体系统之一.到目前为止,人们已在宇宙观测到了约一千亿个星系.它们中有的离我们较近,有的非常遥远,目前所知最远的星系离我们有将近一百五十亿光年.Galaxies,isthestarsintheuniverse“is
6、land”,itisoneofthelarge（天体mstandostbeautifulcelestialsystem系统)intheuniverse.Todate,about100billiongalaxieshavebeenobservedintheuniverse.Someofthemwehaveclose,someveryfaraway,thefurthestgalaxyknowntodayalmost15billionlightyearsawayfromus.GalaxiesSpacethereisadifferencebetween,theuniversetheuniverse
7、containsaspace.wearelivuniverse:Theuniverseincliungindedalltheplanets,themilkyway,evenpartoftheunivweareallerse.Theworldwethereisnoqlivein,OurEartuestionoflivinginspace:h'sland,oceans,air,theseanotpartofthespace,
