Is there any proof of the speed of gravity interaction?
As far as I know, there is no evidence that gravity waves move at the speed of light – though everything I have read on the subject assumes this. Could you give any names of scientists or web sites relating to the idea that they move at some other speed? We do not yet have a device that can detect gravity waves directly, so measuring their speed is impossible. The existence of such waves is strongly suggested by observations of systems with 2 stars very close to each other orbiting about their common centre of gravity. General relativity predicts that they should be radiating gravity waves and gradually losing momentum and getting closer together. This effect has been observed and is generally regarded as evidence that gravity waves do exist. However, these observations give no clue as to the speed of the gravity waves.
