When Apollo 17 astronauts collected a small rock from the moon more than 50 years ago, they had no way of knowing it would still be challenging scientists' understanding of lunar history today.
On Dec. 11, 1972, Apollo 17 became the last mission to launch humans on the moon. [‘On This Day in Space’ Video Series on Space.com] With two astronauts on board, the lunar module Challenger touched ...
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