As the investigation into and recovery from the Challenger disaster proceeded ... of Discovery’s Space Shuttle Main Engines (SSMEs) were part of the program’s recertification mandate.

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 ...

When the Challenger space shuttle exploded a little over a minute after its launch in 1986, it pierced the dreams of millions about who watched the tragedy unfold live on television.