Earth Shine - In this picture, the Moon appears in two parts: an overexposed bright crescent and a dim region completing the Moon's disc. This type of picture shows the phenomenon of earth-shine. This phenomenon occurs when the Sun's light reflects off the Earth, to the Moon, and then back to Earth. This extra reflection of light causes the portion of the moon which is not directly illuminated by the Sun (the dim portion) to appear alongside the portion which is directly illuminated (the bright crescent). You can usually see earth shine if you look carefully at the crescent Moon around sunset.
