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Do gravitational waves have a certain speed? Is it the speed of light or infinite, or am I misunderstanding what a gravitational wave is? I think it is a ripple in spacetime caused by interactions between objects, but i could be wrong.

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As I understand it, it is the speed of light.

As to what gravity actually is, oh boy, now that's a question. Physicists are still trying to work it into the Standard Model.

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  • $\begingroup$ I know gravity is a pretty big mistery. Have they confirmed the existence of gravity waves yet, have they detected any? $\endgroup$ Apr 10 '14 at 20:41
  • $\begingroup$ @stanleydodds: Gravitational waves were recently discovered last month. Note that they are not fixed at the speed of light $c$, and may propagate slower depending on their amplitude. For a brief overview of gravitational wave metric in GR, see perimeterscholars.org/410.html, lecture 4. $\endgroup$
    – JamalS
    Apr 10 '14 at 20:47

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