Is the effect of gravity asymptotic with distance? For example does a single proton floating around exert a tiny effect on space on the other side of the galaxy? It seems to me like gravity can't know what constitutes a contiguous mass-energy, so it must be just the accumulation of the effects of every particle in the vicinity. And if the particles in my body are exerting a tiny amount of gravitation to matter in Andromeda 2.5 million light-years away, is this effect instantaneous? These seem like questions that can't really be answered, but I'm curious where the math/theory points.