CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Earth and Moon. Artwork of the Moon emerging behind the Earth, centred on Asia, on a starfield. The Moon is the Earth's only natural satellite. Its orbital period around the Earth is equal to its period of revolution (27. For this reason the Moon always keeps the same face turned towards the Earth. The Moon is marked with dark areas called the lunar maria (or seas) and craters caused by meteorite impacts.
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