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This question already has an answer here:

Related to: How fast does gravity propagate?

In the related question and in many other questions here, it seems as if the propagation speed of the gravitational interaction is $c$. To my understanding, the only axioms of relativity is that the propagation speed of light (read here EM waves) in vacuum is $c$, and that the laws of physics must be the same in every inertial reference frame.

How can we conclude that the propagation speed of the gravitational interaction is the same as the propagation speed of the EM interaction?

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marked as duplicate by Kyle Kanos, jinawee, John Rennie, Brandon Enright, Qmechanic Mar 19 '14 at 20:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ possible duplicate of "Speed" of Gravity and Speed of Light $\endgroup$ – Kyle Kanos Mar 19 '14 at 19:31
  • $\begingroup$ Possible duplicate indeed! Should I remove my question? $\endgroup$ – PhilMacKay Mar 19 '14 at 19:38
  • $\begingroup$ It'll likely get closed soon enough, so don't worry about deleting it. $\endgroup$ – Kyle Kanos Mar 19 '14 at 19:42