General relativity describes gravity through the curvature of spacetime produced by matter, energy, momentum, and pressure.
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Mass-energy changes spacetime geometry; that geometry determines how matter and light move.
supported03
General relativity correctly predicts Mercury's anomalous perihelion advance, gravitational redshift, light deflection, Shapiro delay, frame dragging, binary-pulsar orbital decay, black-hole dynamics, and directly detected gravitational waves.