MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Crescent Earth and Moon, computer artwork. The Moon's diameter is around a quarter of that of the Earth, but it orbits the Earth at a distance of around 385,000 kilometres, appearing about the same size as the Sun. The Moon's phases are seen as it moves into and out of the light of the Sun as it orbits the Earth.
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