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1、OursolarsystemWeareinthesolarsystem.Therearenineplanetsinit.TheyaretheMecury(水星),theVenus(金星),theEarth,theMars(火星),theJupiter(木星),theSaturn(土星),theUanus(天王星),theNepturn(海王星)andthePluto(冥王星).Theycan’tgiveuslightandheat.Butthesuncangiveuslightandheat.Thisisthesol
2、arsystem.Nineplanetsgoroundthesun.Theyneverstop.Thesunisthehostofthesolarsystem.Itisastar.Itisverybig,brightandhotbecausethesunismadeofhotgas.Itisverybig,soitisveryheavy.Itis20000000000000000000kilogram.Then,wetalkaboutnineplanets.Mecury(水星)isthenearest(接近)plan
3、et(行星)tothesun,soitisveryhot(熱).Itiswhite.Ithasnosatellite(衛(wèi)星)goroundit.Venus(金星)isthesecondnearestplanettothesun.Ithasnosatellite,too.ButitishoterthantheMecury.Itisgolden.Itisthebrightestplanetofthesolarsystem.MecuryandVenushavenosatellite.Theotherplanetbothha
4、veatleast(最少)onesatellate.WeareontheEarth.Ithasasatellite--moon.Itistheonlyonehasairinthesolarsystem.Itisn’tveryhotorcold,sowecanliveontheEarth.Marshastwosatellites.Itlookslikearedstarinthesky.Ithasseasons.Somepeoplesay,therearepeopleonit,anditisnottrue.Andthen
5、extfourplanetsaregasplanets.Theyhaveringroundthemselves.Jupiteristhebiggestplanetinthesolarsystem.Itisverybig.Ithas16satellitesroundit.Saturnisabigplanet,too.ButitissmallerthantheJupiter.Ithas22satellitesMorethantheJupiter.WeneedatelescopetoseeUanus,Neptune.Bec
6、ausetheyareveryfartotheEarth.Uanusisgreen.Ithas15satellitesroundit.Ittakes84yearsgoroundthesun.Neptuneisblue.ItHas8satellitesroundit.Ittakes164yearsgoroundthesun.Itismorefartothesun.Plutoisthefarestonetothesun.Wecannotseeit.Itisthesmallestplanetofthesolarsystem
7、.338Now,doyouknowwhatisthesolarsystem?