We all remember where we were when we heard the news that the space shuttle Challenger had exploded shortly after lift-off, January 28, 1986. I was attending North Texas State University (now University of North Texas), getting my Master's degree in Chemistry. I was speaking with a co-worker, his wife and a potential lab partner when our major professor's wife came in with the news.
An O-ring on a solid rocket booster (SRB) failed, pressurized burning gas from within to reach the adjacent SRB aft field joint attachment hardware and external fuel tank, causing the explosion 73 seconds after launch.
The disaster led to NASA halting the space shuttle program for almost 3 years.
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