DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Waxing crescent Moon. The bright crescent phase of the Moon is visible due to sunlight reflected from the Moon. The rest of the Moon is visible due to Earthshine, which is the fainter reflection of sunlight from the Earth to the Moon and back again. In the dimmer portion of the Moon, lunar maria (dark areas) are seen.
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