NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Moon over airglow of Earth's atmosphere. 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 one face turned towards the Earth. The Moon is marked with dark areas, the lunar seas (maria), as well as craters caused by meteorite impacts. Photographed on 21 December 1999 from the Space Shuttle Discovery, during mission STS-103.
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