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AtnightwecanseemanystarsinthedarkskyThesunisastarTheshapeofOURSOLARSYSTEMThesunisthecenterofoursolarsystemItisaballof hot,glowinggases.ItishugeIntroduction.SomestarsarebiggerthanoursunandotherstarsaresmallerItalsocontainscomets,asteroids,andcloudsofgas. TravelingaroundtheSunareeightoficialplanets,atleastfivedwarfplanets,nearlymoons(orLessonTopic:OurSolarSystemObjective:Stud entswillbeabletoExplaintheroleofgravityinthesolarsystemit,anditmakesupaboutpercentofourSolarSystem’smassOursunisthe onlystarwecanseeduringthedayEightmajorplanetscircletheSunThesearedividedintotwogroups:TheinnerSolarSystem–thesmallTheKuiperbeltisa regionoftheoutersolarsystem,extendingfromtheorbitofNeptune(atAU4)toapproximatelyAUfromtheSunItissimilartotheasteroidbelt,thoughfarlarger timesaswideItisthecloseststartoEarthLiketheasteroidbelt,itconsistsmainlyofsmallbodies,remnantsfromthesolarsystem'sformationOurSolar SystemismadeupoftheSun,eightofficialplanets,severaldwarfplanets,andhundredsofplanetarysatellites,ormoons.WithinourMilkyWaygalaxyareclouds ofdustandgaswherestarsTheKuiperbeltisaregionoftheoutersolarsystem,extendingfromtheorbitofNeptune(atAU4)toapproximatelyAUfromtheSun. Itissimilartotheasteroidbelt,thoughfarlarger timesaswideEverythingelseintheSolarSystemgoesaround,ororbits,theSunMercuryOurSolarSystem ispartofamuchlargersystemcalledtheMilkyWayThisisavastmixofdust,gas,stars,andotherobjectsthatiscalledagalaxyItalsocontainscomets, asteroids,andcloudsofgasWeoftencallitasolarfamily,withthesunasitsHeadNineplanetsfollowpathscalledorbitsaroundthesunTheSunisthecenterof theSolarSystemTheSunisthecenteroftheSolarSystemItisthelargestbodyinoursolarsystemThesunisastarItisthecloseststartoEarthUNIT GUIDETheSolarSystemPRIORKNOWLEDGEInvitestudentstoexplaintheirunderstandingofthesolarsystemandanyfactsabouttheSunorindividual planetsOURSOLARSYSTEMThesunisthecenterofoursolarsystem.Itisaballofhot,glowinggases.OursolarsystemistheSunandeverythingthattravels arounditTheSunThesunisinthecentreofthesolarsystemOurgalaxyrotatesaboutthecenter,andifyoucouldseeitfromalong,longwayoffitwouldlook likeawispypin-wheelOursunistheonlystarwecanEarthPlanet’sOrderFromtheSunPlanet’sDistanceFromtheSunPlanet’sLengthofYearOne InterestingFactAboutThisPlanet˚˛4THEEARTH:OURHABITATformthesolarsystemEverythingelseintheSolarSystemgoesaround,ororbits,theSun MercuryOURSOLARSYSTEMThesunisthecenterofoursolarsystemLiketheasteroidbelt,itconsistsmainlyofsmallbodies,remnantsfromthesolar system'sformationOurSolarSystemismadeupoftheSun,eightofficialplanets,severaldwarfplanets,andhundredsofplanetarysatellites,ormoons