DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Waning gibbous Moon. Optical image of a waning (decreasing in apparent size) gibbous Moon, 21 days into its 28-day cycle. The Moon is said to be gibbous when it is more than half full. The phases of the Moon occur as it reveals different amounts of its sunlit face as it orbits the Earth.
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