DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Crescent Moon, seen above the Vancouver skyline, Canada. This is a waxing crescent Moon, halfway between a new Moon and the first quarter (half Moon). The phases of the moon (new Moon, first quarter, full Moon and then back to new Moon) are due to its orbit around the Earth. Each cycle takes around 28 days.
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