What NASA flights crashed?
What NASA flights crashed? 3 in November of 1967, the near-loss of Apollo XIII in April of 1970, the destruction of Challenger in January of 1986, and the disintegration of Columbia in February of 2003. Biographies of the lost astronauts are listed at Astronaut Biographies.
What was the worst space incident?
The space shuttle Challenger disaster that occurred on January 28, 1986, marked one of the most devastating days in the history of space exploration.