Well, i know i might be far oversimplifying this as its not understood properly by science yet but. A permanent magnet seems to lose its magnetism slowly as it does work on other objects. (conservation of energy) Is this in any way true for gravity, does a mass "lose" its pulling power after doing sufficient work. (of course we've never observed this happening). And if this DOESN'T happen, isn't gravitational "pulling" is essentially infinite? sure you have to put in kinetic energy to increase the Gravitational potential energy, (the object has to start at a distance AWAY from the gravity-causing-mass) but other then that, can the pulling power of gravity be described as infinite, only dependent on the existence of another object with which to exert itself?