This produces an explosion as energy of motion is converted to heat. Orbits Earth Rotation is synchronous - turns once for every orbit around Earth End result of tidal effects Wobbles a little as it rotates We will see a demo of this with Redshift. Recently the Clementine and Lunar Prospector missions have detected evidence of water ice near the N and S poles of the Moon. There are craters there whose floors remain in constant shadow - cold enough to trap water molecules from comets that hit anywhere on the Moon. Maybe enough water to fill one of the Great Lakes.
Water is also one of the heaviest parts of life support on manned spacecraft.
Use solar power on rims of craters to make fuel. Base for further solar system exploration.