NASA Astronaut Dr. <a href="https://en.wikipedia.org/wiki/Ronald_E._McNair" class="extiw" title="w:Ronald E. McNair">Ronald E. McNair</a> (PH.D.) was assigned as a mission specialist and was a crewmember on two Space Shuttle Missions. He first flew on STS 41-B in 1984 where he performed numerous science experiments.  On his second flight, STS 51-L, Dr. McNair died on January 28, 1986 when the Space Shuttle Challenger exploded after launch from the Kennedy Space Center, Florida. NASA Photograph. S78-35300 (31 Jan 1978)
NASA
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