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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1possible duplicate of The speed of gravity? – jinawee Apr 10 '14 at 21:00
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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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I know gravity is a pretty big mistery. Have they confirmed the existence of gravity waves yet, have they detected any? – stanley dodds Apr 10 '14 at 20:41
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@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 http://perimeterscholars.org/410.html, lecture 4. – JamalS Apr 10 '14 at 20:47