The effects of gravity travel at the velocity of the speed of light in a vacuum (3x10^8 m/s).
Leveraging off of what Steven said in a another post regarding a query I had regarding black holes - gravity is an effect caused by curvature in space. Nothing can travel through that space faster than the speed of light and this includes any changes to its curvature due to any moving masses embedded in it.
I hope that Steven - or others - will correct me If I'm off-track.
Mark C.
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