On This Date…March 13 and STS-29

#OTD in 2001…Discovery launched on an International Space Station crew exchange mission

OTD…Launch of Discovery in 1991 on a Defense Department research flight

The first crew to inhabit Skylab — Conrad, Weitz and Kerwin — launched today in 1973 for a 28-day mission that successfully made critical repairs, brought the station into operation and conducted solar astronomy, Earth resources and medical experiments.