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NASA's Apollo program was a 17-mission program that focused on landing a human on the lunar surface. The program was the third human spaceflight by NASA, after Mercury and Gemini.

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Why did NASA send two astronauts to the moon instead of one?

I cannot comment, but I just wanted to share some information (as I just wrote a paper on Project Apollo). First, there is an excellent resource available from NASA called Chariots for Apollo. The cha …
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