GrotzingereJordan。Press。Siever|UnderstandingEarthFifthEdition春uit育UEARLYHISTORYOFTHETERRESTRIALPLANETSCopyright2007byW.HFreemanandCompany吊国医ayEarlyHistoryoftheTerrestrial2c占郴鲑s标AboutTerrestrialPlanets(粟地户界)*“Thesolarsystemanditsplanetsformed_aroundtheSun.邵隅票莺卞阳票帅汽望圃荨莞荨者卞隅问叼蒯*Theplanetsdifferentiatedintolayeredbodies.河分琊fn魍骷跚tou.com*“ThegeologicprocessesthatformedMercury,Venus,Earth,Moon,andMarsaresimilarinmanyWayS吻哺大标国乙ij亨喽朴川/尸)LectureOutline仁Origin吴cu2_冒ayEarth:formingalayeredplanet侏仪E颖B怡a口4.Agea吊F薯圃h魅t藿)刨阗翼)嗜啊yc颂Ew标述6.Exploringthesolarsystemandbeyond1.Originofthesolarsystem(卜忏薯蠡熹售户勺霆J素唁飞)十.Thenebularhypothesis(述沥伟thesunforms(一限5内)氏vsuou伟planetesimals(小与卵儒)伟innerplanets(F|不卵酶),发uL园的)1.Originofthesolarsystem“Thenebularhypothesish毛Gascloudbeginstocontractundertheforceofgravity目ContractioncauSescloudtospeedup(thinkIceSkate5)hctThesunformsEuuoosuR述J。Particlesbegintocondenseasthediskcools。PlanetesimalsformfromthecollisionoftheseparticlessInnerplanets-smallrockyplanetstooclosetotheSunforvolatilestoexistingreatquantitye吴Adiffoser,roughiyspherical,slowlyrofatingnebulabeginstocontract。uJ1林明L印L阮flat,rapidlyrotatingdiskformswiththemattercontentratedatfthecenterthatw训becometheproto-Sun.Theenvelopingdiskofgasanddustfformsgrainsthafcollideandclumptogetherintosmallthunksorplanetesimals.LlU明Jmultiplecollisionsandaccretionofplanetesimalsbygravitationalattradtion.6iantouterplaneisgrewbygasadtretion.ECCEUEIE相EE