No, you'd be surprised. You can do an experiment where you just take 2 large masses (say bolders) and put them across from each other with a suspended balance-b

No, you'd be surprised. You can do an experiment where you just take 2 large masses (say bolders) and put them across from each other with a suspended balance-bar in the middle (suspended from the ceiling so that it spins freely). Over the night the bar will align to the masses via gravity. Can't find the experiment because of no keywords for it I can think of, but this shows that even a few 100 kilos have real amounts of gravity. Edit: Here it is: http://en.wikipedia.org/wiki/Cavendish_experiment http://en.wikipedia.org/wiki/Cavendish_experiment