M O O N

The Moon is the only natural satellite of the Earth, and the fifth largest satellite in the Solar System.

The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the brightest object in the sky after the Sun, although its surface is actually very dark, with a reflectance similar to that of coal.

The Moon is thought to have formed nearly 4.5 billion years ago, not long after the Earth.

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