Question

1.
Why can we never see the back side of the moon from Earth?
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Answer 1

Answer:

We don't see the far side because “the moon is tidally locked to the Earth,” said John Keller, deputy project scientist for NASA's Lunar Reconnaissance Orbiter project. ... If the moon were a perfect sphere, then the gravity felt on the far side and the near side (or Earth's side), would cancel each other out.