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NASA Science Source
Photograph - Photograph
The Moon, showing part of its far side, photographed from the departing Apollo 15 spacecraft in August 1971, after its Moon landing. The dark patches at center right are some of the lunar seas (maria) which are characteristic of the face it presents to Earth. The heavily-cratered region at center left is on the far side of the Moon, which is never seen from Earth. The Moon always presents the same face to Earth, as it rotates on its axis in the same time that it orbits around Earth. Such gravitational locking of an orbit is common amongst satellites.
August 19th, 2014
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