A really naive thought!!!
Quote from:
http://motls.blogspot.com/2006/07/columbia-university-crackpot-joins.html"Where is the energy that keeps the moon in orbit coming from? Well the moon already has some energy so lets look at that first. Its moving, so it has kinetic energy (the energy of motion) and it is in a gravitational field so it has potential energy. While the moon circles the Earth it actually trades gravitational potential energy and kinetic energy. As it moves away from the earth it gains potential, as it does this it slows down losing potential. This causes it to move back towards the earth, losing potential and gain kinetic. It doesn't have enough energy to escape earth’s pull, which would require more kinetic energy than it has to over come the potential energy of the gravitational field."
Has the moon, and every other orbiting body, discovered perpetual motion?
