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Orbiting earth at an average distance of about 384403km, the moon is
in synchronous rotation, meaning that it keeps nearly the same face
turned away from Earth at all times. Impact craters form when
asteroids and comets collide with the lunar surface, and globally
about half a million craters with diameters greater than 1km can be
found. The energy required to melt the outer portion of the Moon is
commonly attributed to a giant impact event that is postulated to
have formed the Earth-Moon system, and the subsequent reaccretion of
material in Earth orbit. |
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