Why does gravity take affect instantly?
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M$2 Answers
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M$
I cited the binary pulsar example because it is a real-world observation matching a prediction of general relativity, a prediction that especially depends upon gravity's speed being finite. So far, general relativity has passed every observational and experimental test. It is likely that the universe *on the macroscopic scale* obeys rules that are very similar to general relativity. And general relativity says: the speed of gravity = the speed of light.
On the very small scale, you enter the world of quantum mechanics and things get very, very complicated when you try to incorporate gravity. I do not have the knowledge to answer about this.
http://en.wikipedia.org/wiki/General_relativity
How does the observation of a binary pulsar prove that gravity does not move faster than the speed of light? Why can't gravity be infinitely fast moving between difference membranes as closed strings? gravitons.