Forty years ago today, Americans were stunned, shocked and saddened when the Challenger space shuttle exploded 73 seconds after liftoff on a cold, cloudless day in Florida. A booster leak ignited the ...

Forty years ago, the NASA space shuttle Challenger exploded 73 seconds after liftoff, killing all seven crew members. Among the seven crew members were five NASA astronauts, as well as a payload ...

Their eyes were watching. Some knew something was wrong. Others were slow to realize. Soon everyone came to grief. Forty years ago Space Shuttle Challenger climbed into the clear amid blue skies over ...

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 ...

On Feb. 1, 2003, the Space Shuttle Columbia disintegrated upon reentering Earth's atmosphere, killing all seven crew members on board. Major Garrett introduces CBS News Radio's coverage from that day.

Five astronauts and two payload specialists make up the STS 51-L crew, scheduled to fly aboard the Space Shuttle Challenger in January of 1986. Crewmembers are (left to right, front row) astronauts ...