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Because Earth's Moon rotates around the Earth and shows us nearly the exact same side it is considered to be in "synchronous rotation".
The Moon's synchronous rotation was not always like this, in its early days it was not synchronous but because of Earth's gravity (being much larger than the Moon) it has slowed down the Moon's rotational speed.
The Moon rotates on its own axis about once for every 27.3 days as it takes to rotate the Earth. Hence the reason why we always see the same side of the Moon facing Earth.
The following work is credited to Tom Ruen.
This displays the Moon's Libration or oscillation of the Moon around the Earth. The sequence of images were taken over the course of several weeks from October 11, 2007 to November 9, 2007.
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