NASA
Nasa: Information on the Sts 51 L Challenger Accident
The mission profile of the Challenger accident, including the sequence of events, images and movie clips, crew profiles, and the report of the Presidential Commission.
NASA
Nasa: Astronaut Biography: Ellison S. Onizuka
Official NASA biography of Ellison S. Onizuka, the mission specialist on the Challenger spacecraft which exploded shortly after launch.