Is its rotation on its own axis so perfectly synchronized to how it rotates around the earth? I imagine even a fraction of a degree off will eventually cause a part of the other side to be revealed even if it takes a very long time.
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In addition to the explanations given already, I will also stress that it’s common and normal for tidal locking to occur; the majority of moons in our solar system are locked with their planets, Mercury has a different kind of synchronous rotation, and we can calculate some exoplanets are locked to their host stars.
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