OTD…April 19 and STS-100

#OTD…The first launch of Challenger in 1983 and Columbia’s shortened Spacelab mission in 1997

Studying the atmosphere as part of NASA’s Mission to Planet Earth was the objective of shuttle Atlantis’ STS-45 mission in March 1992.

#OTD…Launch of a 1994 Space Radar Lab mission on Endeavour