PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY
Crescent moon over a satellite dish. The Moon does not produce light. Instead it reflects light from the Sun. It takes 28 days to orbit the Earth, during which time the proportion of its lit face visible from Earth varies between all to none and back again. Photographed in north Finland at sunset.
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