"Why is Mars considered to be the most likely candidate for life elsewhere in the solar system, and not Europa?"
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Question
How many moon landings have there been?
There were 6 piloted landings in the Apollo program (Apollos 11, 12, 14, 15, 16 & 17) plus a number of robotic landings before and since then. Counting orbiters as well as landers, there were 9 3-man Apollo flights that reached the Moon between December 1968 and December 1972.
David Morrison
NAI Senior Scientist
June 13, 2003
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