THIERRY LEGAULT / EURELIOS / SCIENCE PHOTO LIBRARY THIERRY LEGAULT / EURELIOS / SCIENCE PHOTO LIBRARY
Waning crescent Moon. North is at bottom. As the Moon orbits the Earth, the amount of sunlight seen on its visible hemisphere varies in a regular 28- day cycle. This is a waning crescent Moon, 25 days into the cycle. As the cycle progresses, the motion of the Moon in its orbit around the Earth will move this visible hemisphere further out of the sunlight. Darkness will encroach (from left) as the lunar night falls on a waning Moon. Photographed in Earth's southern hemisphere.
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