Eras end fast at NASA: The moment Apollo 17 splashed down in the Pacific Ocean on December 19, 1972, America’s initial lunar ambitions came to an end. The moment the shuttle Atlantis rolled to a stop at the Kennedy Space Center in Florida on July 21, 2011, that was the close of a program that had seen 135 shuttles fly.
Starting a new era, on the other hand, can take a littl…
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