資源描述：
《solar system.ppt》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、SolarSystemSpeaker:carolcontentStarPlanetandSatelliteCometExtra-terrestrialMilkywaygalaxy['ɡ?l?ksi]SolarsystemHowmanyplanetinsolarsystemMercury['m?:kjuri]水星Venus['vi:n?s]金星Earth地球Mars火星Jupiter['d?u:pit?]木星Saturn['s?t?n]土星Uranus['ju?r?n?s]天王星Neptune['neptju:n]海王星Pluto['plu:t?u]冥王星Plutoisnowconsi
2、deredadwarfplanetdwellingintheKuiperbelt.Neptune[‘neptju:n]海王星originManyscientiststhinkoursolarsystemformedfromagiant,rotatingcloudofgasanddustknownasthesolarnebula['nebjul?].Asthenebulacollapsedbecauseofitsgravity,itspunfasterandflattenedintoadisk.Mostofthematerialwaspulledtowardthecentertofor
3、mthesun.Otherparticleswithinthediskcollidedandstucktogethertoformasteroid-sizedobjectsnamedasplanetesimals[pl?n?'tesim?ls],someofwhichcombinedtobecometheasteroids,comets,moonsandplanets.SolarSystemInnerSolarSystemInnerPlanets:Theinnerfourplanets—Mercury,Venus,EarthandMars—aremadeupmostlyofirona
4、ndrock.Theyareknownasterrestrial[ti'restri?l]orearthlikeplanetsbecauseoftheirsimilarsizeandcomposition.AsteroidbeltOuterSolarSystemOuterPlanetsCometsSolarsystemThesolarwindfromthesunwassopowerfulthatitsweptawaymostofthelighterelements,suchashydrogen[‘haidr?d??n]andhelium氦['hi:li?m],fromtheinner
5、mostplanets,leavingbehindmostlysmall,rockyworlds.Thesolarwindwasmuchweakerintheouterregions,however,resultingingasgiantsmadeupmostlyofhydrogenandhelium.SunThesunisbyfarthelargestobjectinoursolarsystem,containing99.8percentofthesolarsystem'smass.Itshedsmostoftheheatandlightthatmakeslifepossibleo
6、nEarthandpossiblyelsewhere.Planetsorbitthesuninoval-shapedpathscalledellipses[i'lipsiz],andthesunisslightlyofftothesideofthecenterofeachellipseConsistentofsunPhotospheresolarprominence['pr?min?ns]日珥Corona[k?'r?un?]日冕t(yī)otalsolareclipseMercuryVenusEarthcentrosphere['sentr?sfi?]mantle['m?ntl]earthc
7、rustgeomagneticfieldperiodofrevolutionrotationrevolutionMars-222℃to30℃Celsius['selsi?s]degreeMarsfaceAgeofTeras['ter?s]AsteroidbeltAsteroidbeltAsteroidsareminorplanets,mostofwhichcirclethesuninaregionknownastheasteroidbelt,between
