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I know Maxwell equation shows that it is the electric and magnetic properties of empty space which is why speed of light is constant, but what about gravitational waves? I have visited many answers but so far none seems satisfactory to me. Can we prove that gravitational wave is also a constant?

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This is because gravitational waves are massless. Special relativity states that massless matter moves at $c$ in vacuum.

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  • $\begingroup$ How do you manage to post an answer after this question was closed! What socery is this? ;D $\endgroup$ – user6760 Jan 21 at 12:27
  • $\begingroup$ Just luck, I think. That and the answer is correct! $\endgroup$ – my2cts Jan 21 at 17:30

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