Two masses M1 and M2 are separated by some distance. M1 accelerates towards M2 and reciprocally.
Then because e=mc2, M1 converts totally into energy (which I believe would be photons) and vanishes.
Question: Does M2 stops accelerating towards M1 at the exact moment (whatever that means) that M1 disappears?
It is said that gravitation violates relativity because it "travels" at the speed of light, but maybe the information does not actually travel so fast. Maybe it takes 2 light-years for a body to register the presence of another body that is 2 light-years away, and then it is indefinitely attracted to it because it "knows" that it is there, and the speed of communication of the information that the mass of an object has changed cannot go faster than the speed of light.
Other question: Assuming the photons are in a hollow sphere (with negligible mass) and cannot escape, is M2 still attracted to that photon density?
Disclaimer: I am not a physicist, just curious, please be kind.