long story short, gravity is the curvature of spacetime. objects of mass cause the curvature, and the curvature in turn causes objects to move locally along geodesics (shortest-distance paths), which causes the curvature to shift
when you throw a ball and it's moving through a parabola, that curve taken with time in a riemannian space is actually the straightest line possible from one end of the throw to the other
long story short, gravity is the curvature of spacetime. objects of mass cause the curvature, and the curvature in turn causes objects to move locally along geodesics (shortest-distance paths), which causes the curvature to shift
when you throw a ball and it's moving through a parabola, that curve taken with time in a riemannian space is actually the straightest line possible from one end of the throw to the other
this is Einstein's magnum opus General Relativity