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1、i-01-LBJ-86176108/16/20041:43PMPagei(tl)NASA/SciencePhotoLibrary/PhotoResearchers,(tr)Billy&SallyFletcher/TomStack&Assoc.,(b)Photodisci-01-LBJ-86176108/16/20041:43PMPageiiAstronomyThiscollectionofimagesisofJupiter,Io(oneofitsmoons),Mars,andtheAndromedaGalaxy.TheAndromedaGala
2、xyisthemostdistantobjectvisibletothehumaneye.Atadistanceof2.2mil-lionlightyears,itappearsasafuzzypatchoflightinthenightsky.Copyright©2005byTheMcGraw-HillCompanies,Inc.Allrightsreserved.ExceptaspermittedundertheUnitedStatesCopyrightAct,nopartofthispublicationmaybereproducedor
3、distributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutpriorwrittenpermissionofthepublisher.TheNationalGeographicfeaturesweredesignedanddevelopedbytheNationalGeographicSociety’sEducationDivision.Copyright©NationalGeographicSociety.Thename“NationalGeogra
4、phicSociety”andtheYellowBorderRectanglearetrademarksoftheSociety,andtheiruse,withoutpriorwrittenpermission,isstrictlyprohibited.The“ScienceandSociety”andthe“ScienceandHistory”featuresthatappearinthisbookweredesignedanddevelopedbyTIMESchoolPublishing,adivisionofTIMEMagazine.T
5、IMEandtheredborderaretrademarksofTimeInc.Allrightsreserved.Sendallinquiriesto:Glencoe/McGraw-Hill8787OrionPlaceColumbus,OH43240-4027ISBN:0-07-861761-8PrintedintheUnitedStatesofAmerica.2345678910027/043090807060504(tl)NASA/SciencePhotoLibrary/PhotoResearchers,(tr)Billy&SallyF
6、letcher/TomStack&Assoc.,(b)Photodisci-01-LBJ-86176108/16/20041:43PMPageiiiAuthorsRalphM.FeatherJr.,PhDDinahZikeScienceDepartmentChairEducationalConsultantEducationDivisionDerryAreaSchoolDistrictDinah-MightActivities,Inc.Washington,D.C.Derry,PASanAntonio,TXSeriesConsultantsCO
7、NTENTSAFETYWilliamC.Keel,PhDAileenDuc,PhDDepartmentofPhysicsandAstronomyScience8TeacherUniversityofAlabamaHendrickMiddleSchool,PlanoISDTuscaloosa,ALPlano,TXMATHSandraWest,PhDDepartmentofBiologyTeriWillard,EdDTexasStateUniversity-SanMarcosMathematicsCurriculumWriterSanMarcos,
8、TXBelgrade,MTACTIVITYTESTERSREADINGMaryHelenMariscal-CholkaCarolA.Senf,PhDW
