OTD…May 4 and STS-30

#OTD in 2009…Discovery launches on her silver anniversary mission

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.

#OTD in 1991…The launch of Columbia on Spacelab Life Sciences 1 mission