Quote Originally Posted by exterminator
When we consider such issues like weight on earth we donot consider the infinite bodies in space and their pulls... because their effect is near to negligible than that of the earth... (remember acceleration due to gravity is proportional to the inverse of square of the distance that separates the two bodies...
Actually, if you assume that gravity is proportional to the inverse of the square of distance, then you have to conclude that there can not be infinite bodies in space. Infinite bodies by definition would have to be "evenly distributed" over infinite space. That is, if you took an infinite space and filled it with an infinite amount of objects, any given point would be indistinguishable vis-*-vis being the center of mass. This would mean that within such a system, nothing would be able to move as there would be an infinite gravitational attraction along every vector. Remember, if you multiply an infinitesimal amount by infinity, you still get infinity.