Challenger, NASA
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Families of the seven astronauts who died aboard the space shuttle Challenger gathered to commemorate the 40th anniversary of the tragedy.
The space shuttle Challenger explosion was a defining moment of the 1980s. Whether you were watching on TV or in person, chances are, you remember exactly where you were and how you felt.
Former astronaut and professor Terry Hart is opening up 40 years later about the friends and colleagues he lost on board the space shuttle Challenger explosion.