NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
The Moon, showing part of its far side, photographed from the Apollo 16 spacecraft after its landing on the Moon in April 1972. The dark patches at upper left are some of the lunar seas (maria) which are characteristic of the face it presents to Earth. The heavily-cratered region at right 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.
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