2. How many U.S. spacecraft have landed on the Moon since the Apollo 17 mission returned to Earth?

Answer:

(B) One. Lunar Prospector, an unmanned mission that went to the Moon in 1997, was deliberately crash-landed on the Moon at the end of its mission in an attempt to excavate some of the ice near the south pole. If it had worked, this might have provided some information about how deep the ice is and how much of it there is. However, no ice was seen after the crash.

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