It has been 40 years since NASA launched the first dedicated Department of Defense Space Shuttle mission, after which engineers spotted O-ring seal defficiencies that would doom Challenger a year ...

It was the 25th shuttle launch ... 36 degrees on Launch Pad 39B at 11:38 a.m. when the Challenger launched. As we would all learn, the O-rings did lose elasticity in the cold, leaving gaps ...

In 1986 he somewhat reluctantly agreed to join the Rogers Commission, whose task was to investigate the Challenger disaster. The space shuttle ... disaster was that O-rings on one of the sections ...