*Sigh* The Moon is Earth's only natural satellite, and is one of the main reasons that we have tides, the other reason being the Sun. Now, the Moon was created billions of years ago when a roughly Pluto-sized object smashed into Proto-Earth, which sent a large portion of Earth's mass into space, a lot of it clumping up to eventually form the Moon. The Moon's current radius is 1,079.6 miles.