There is clearly an invisible force tethering luna to sol-3.  Would it be wise to harness part of its energy?  Can we seep from it and not throw the balance of this star system out of wack?  One mistake and its ping pong city, raining rocks everywhere.  Bad, very bad.  Very very bad.  Forget i mentioned it.   But what if its force is so great that it could easy power cities, vehicles  and our toys forever at the cost of a pebble being in the way of a freight train?