FRANK ZULLO / SCIENCE PHOTO LIBRARY FRANK ZULLO / SCIENCE PHOTO LIBRARY
Gibbous Moon. Gibbous Moon at dusk over rock formations in the desert. The visible side of the Moon, as seen from Earth, is characterised by large dark areas known as "mare" or "seas". The seas have fewer craters which suggests that these basins were filled in recent geological times by volcanic material. The Moon's rotation period around the Earth (27.3 days) equals its period of revolution, which is why it always keeps the same face turned towards us. Photographed in the Superstition Mountains, Arizona, USA.
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