Every wave needs the mechanical equivalent of inertia and elasticity for it to propagate through its medium. For an electromagnetic medium such as space, the electromagnetic equivalent of inertia and elasticity is capacitance and inductance. These are the permittivity and permeability characteristics of space. But what are the equivalent characteristics for gravitational wave propagation through space? Whatever these constants represent as gravity's equivalent of the inertia and elasticity of space I'm sure different substances in space would have different values for these constants. So the speed of gravity would probably be slowed through things like massive objects.
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