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Why do we see only one side of the Moon from Earth? Have humans explored the other side, and, if so, is it different from the nearside?

Sara O’Connor, Gresham, Oregon
Moon
Earth orbits the Sun once every 365 days (a year) and spins on its axis once every 24 hours (a day). The Moon orbits Earth once every 27.3 days and spins on its axis once every 27.3 days. This means that although the Moon is rotating, it always keeps one face toward us.

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