OTD…April 6 and STS-41C

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

American and Soviet crews were launched today in 1975 for the first handshakes in space between the two superpowers as part of the Apollo-Soyuz Test Project.

#OTD in 2012…California welcomes Endeavour back to birth state for retirement