Lift off for the space shuttle Challenger. January 28, 1986, at 11:38 a.m., EST, Kennedy Space Center, Florida. Only 73 seconds into the launch an explosion killed the seven member crew.

Lift off for the space shuttle Challenger. January 28, 1986, at 11:38 a.m., EST, Kennedy Space Center, Florida. Only 73 seconds into the launch an explosion killed the seven member crew.