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Apollo 8 was the first time that human beings had looked down on the back side of the Moon.

The Moon is tidally locked; it spins once per orbit, so that the same side of the Moon is always facing the Earth. (There's a bit of a "jiggle" there because while the Moon SPINS at a constant rate, it's speed in its elliptical orbit varies.) We had launched automated probes to the view the back side of the Earth, but nobody had ever seen it first-hand until Apollo 8 flew around the far side.

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10y ago

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