I was wondering if a gravitic field has a limit, where after a certain distance, determined by the properties of the structure creating the gravity field, the force felt by the 1kg masses becomes 0N. For example, will two 1 kg masses, seperated by an arbitrarily super large value (I.E. 50 billion light years), eventually make contact given an infinite amount of time? Assume that the expansion of the universe is not involved. My initial guess is that there is a limit, and that given an infinite amount of time, the objects will never make contact. My reasoning is that after the first second the rate of change of distance is less that the planck constant, and so since an object cannot move distances smaller than the planck length, the objects will never move.