What can we learn from the dark side of the moon?

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Long ago, an unknown event created significant differences between the Moon’s near side, which faces Earth, and the far side, only visible via spacecraft.
Guest: Dr. Ethan Siegel, Astrophysicist and Author of "Starts with a Bang!"
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What can we learn from the dark side of the moon?

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What can we learn from the dark side of the moon?
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