14. Which is the best description of the Moon's shape?

Answer:

(C) A slightly flattened sphere. There was a period in the 1950s and 1960s when planetary scientists thought that (D) was the correct answer (an ellipsoid) but measurements by the Lunar Prospector spacecraft have showed that the Moon's radius in the east-west direction and the front-back direction are essentially the same. The north-south radius is definitely shorter.

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