Kip Thorne - What is Space-Time?
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PhysicsSpecial relativitySpacetimeBlack holeMetaphysical theoriesSubstantial formEternalism (philosophy of time)Albert EinsteinPhilosophy of physicsPhilosophy of space and timeTheory of relativityFutureMoment (physics)TimePhysicsPhysical cosmologyGeneral relativityAbsolute time and spaceGravitational singularityGrand Unified Theory