The Moon is an astronomical body orbiting Earth and is the planet's only natural satellite. It is the fifth largest satellite in the solar system and by far the largest among planetary satellites relative to the size of the planet that it orbits. The moon is, after Jupiter satellite lo, the second densest satellite in the Solar System among those whose densities are known.
The Moon is thought to have formed about 4.51 billion years ago, not long after Earth. The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a hypothetical Mars sized body called Theia.
The Moon is in synchronous rotation with Earth, and thus always shows the same side to Earth, the near side. Because of libration slightly more than half ( about 59% ) of the total lunar surface can be viewed from Earth. The near side is marked by dark volcanic Maria that fill the spaces between the bright ancient crystal Highlands and the prominent impact craters.
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