Beautiful Moon

The Moon  is the Earth's only natural satellite. Although not the largest natural satellite in the Solar System, it is, among the satellites of major planets. The Moon is thought to have formed nearly 4.5 billion years ago, not long after Earth. Although there have been several hypotheses for its origin in the past, the current most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body.  Source