The Moon is the biggest, brightest object in the night sky, shining almost like a night-time sun. Yet it has no light of its own. It is just a big cold ball of rock, and it shines only because it reflects the light of the sun. It is Earth's companion in space, about 384,000 km away, and circles around it once a month. As the moves around, it also rotates (turns) slowly on its axis, so that the same face always points towards us. The far side of the Moon can never be seen from the Earth's surfaces.
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