All mass has gravity, which is obvious; But how does gravity effect long distances? This is sorta confusing and it'll make me seem like an idiot, but thats okay. Say we have 3 marbles, each close to each other, almost touching, but not quite. Lets say each were molecules. Wouldn't they attract each other, or their gravity adds up, into sets of gravitational waves? I'm probably misinterpreting gravity, or something, though. =(.