OTD…Sept. 20 and Endeavour retirement

#OTD in 2007…The launch of Atlantis with a power truss for International Space Station

#OTD in 1985…Discovery launched on the first classified space shuttle mission for the Department of Defense. Watch the liftoff:

NASA’s first space station — the Skylab orbital workshop — was launched atop a Saturn 5 rocket today, May 14, in 1973.