Preface（第1页）

Preface

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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