Because of the earths gravitational field the earths satellites should be much smaller in size maybe about 30 miles and not 2160 miles in diameter compared to other planets and their satellites. The moon seems to be hollowed out. In an accident in 1969 the moon was hit by a lunar model with the equivalent of 1 ton TNT and it began to ring like a bell scientists said. The reverberation continued for 30 minutes. Samples from moon rocks contained 10 times more titanium than rocks on earth. Many scientists conclude that the moon is artificial. It is more likely that the moon is a very ancient spaceship.