In general relatvity, as in Newtonian gravity, every massive body produces a gravitational field that extends throughout the universe. The strength of that field falls off the further away you go from the center of the body. But in the vast voids between galaxies, can the overall strength cancel out to zero, leaving perfectly flat space? Or is there likely to be curvature at every point in spacetime? Also, about the curvature associated with gravitational fields. Since curvature is a measure of the amount of energy in any given point, does the curvature caused by this gravitational field (extending throughout the universe) also contain energy at each point?