How Does General Relativity Explain Why We Always See the Same Side of the Moon?

jimbobjames
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What part of the theory of general relativity helps us understand why we always see the same side of the moon?

Thanks.
 
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GR is not necessary for this, you can explain it with Newtonian gravitation (which is a limiting case of general relativity), it's known as tidal locking.
 

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