JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Eight-day moon. The twin darker regions in the right hand half of the picture are the Mare Serenitatis (top) & the Mare Tranquillitatis. Visible to the left of the Mare Serenitatis is the beginning of the great Mare Imbrium, here cut off by the terminator. Standing out extremely clearly are the lunar Apennine mountains which mark the south-eastern edge of the Mare Imbrium; they stretch over 720 kilometres & rise to heights of about 6000 metres. The prominent crater at the western (left-hand) end of the Apennine arc is Eratosthenes. Photographed 20 April, 1975, 0520 UT, 12", f/10, Cassegrain focus, 1/8s, K64 film.
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