MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Image comparing the size of Earth with its single Moon. The Moon is 27% the size of its parent, which it orbits once every 27.3 days. Despite its diminutive size compared to Earth, the Moon is actually very much larger, compared to its parent, than any other natural satellite in the Solar System, with the exception of Pluto's largest moon, Charon.
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