5 Worst Accidents in NASA’s History
Wallops Island – Aug. 22, 2008
NASA destroys an unmanned experimental rocket launched from Wallops Island, Virginia, carrying a pair of research satellites after it veers off course. Officials said the rocket – a prototype made by Alliant Techsystems Inc., or ATK – was destroyed by remote control 27 seconds into the pre-dawn flight. It was between 11,000 feet and 12,000 feet high when it exploded. Officials said they do not know why it veered off course. It was destroyed to avoid endangering the public.
Columbia – Feb. 1, 2003

The Columbia shuttle, which had a wing damaged during launch, breaks apart in the Texas skies during re-entry, killing seven astronauts and raining debris over Texas and Louisiana. Investigators determined its left wing was gashed by fuel-tank foam insulation during liftoff, allowing fiery gases to penetrate the shuttle.