In U.S. human spaceflight program, the final launch decision rests with one person: the launch director. NASA's Mike Leinbach on making hardest call.
On September 17, 1976, NASA revealed the Enterprise—its first space shuttle, named after Star Trek's starship. Discover how this pioneering craft shaped American spaceflight history.
The two solid rocket boosters flew in different directions as the external fuel tank became a fireball.(AP: Bruce Weaver / File) Forty years ago, the Challenger space shuttle disintegrated just after ...
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