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Hi David;
I think the original question was: "does gravity have speed / velocity ?"
The way I originally pictured this question was from a propagation-of-gravity-disturbances perspective.
The Newtonian view is cool - no probs ! It made me recheck the original question.
The question of "what is (ie: causes) gravity?" would seem to be a different question altogether, and ends up being highly speculative.
No one has entirely answered this one !
I think we need Brian W to chirp in … and add some meat to his original question …
Cheers
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