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Preface
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Thisisabookabravityiswhatcausesmassiveobjectstofalltowardseachother.It'sgravitythatcausesapplestofallfromtrees，anditwasgravitythatcausedtheEarthtravityisthemostfamiliarofallthefualforature，yetthetruewayinwhichgravityworksisfarfromobvious.Ihepheoas‘gravity’isdeeplytiedupwiththenatureofspadtime.Thismeansthatamoderandingofgravitydoesn’tjusttellushowobjetheUalsoallowsustouhebehaviouroftheveryspadtimethatmakeupthefabricoftheUself.
Thepurposeofthisbookistogivethereaderaverybriefintrodutovariousdiferesofgravity.Westartbylookingatthewayinwhichthetheravitydevelopedhistorically，befontoanoutlineofhowitisuoodbystiststoday.WewillthehecesofgravitationalphysitheEarth，intheSolarSystem，andintheUniverseasawhole.Thefinalchapterdeseofthefrontiersoftreseartheravitationalphysics.
Bytheeohaveveyedtothereadernotonlywhatgravityis，buthowthestudyofgravityhasledstiststoreachextraordinarysaboutthenatureofspace，time，andtheUniverseinwhichwelive.
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