OTD…June 21 and STS-57

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

#OTD in 2005…Discovery launched on the first space shuttle mission after the Columbia tragedy