JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Six-day old moon. The circular dark region at centre right, just beside the moon's limb, is the Mare Crisium. Below it is the Mare Fecunditatis, with the twin dark regions of the Mare Serenitatis (top) & the Mare Tranquillitatis at left, towards the terminator. Numerous impact craters stand out to the right of the terminator. Photographed Dec. Schmidt/Cassegrain, f/10.
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