DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Crescent Moon. The amount of the Moon's sunlit hemisphere visible from Earth varies on a lunar monthly cycle as it orbits the Earth. As seen here, the unlit side of the Moon can sometimes be seen when the Moon's crescent is very thin. This occurs when reflected light from the Earth (Earthshine) illuminates the lunar surface. The phenomenon is known as "the old Moon in the new Moon's arms".
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