OTD…April 29 and STS-51B

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.

Today in 1969, the launch of Apollo 9 and the first manned flight of all lunar hardware in Earth orbit.

#OTD in 1984…Challenger launched the Earth Radiation Budget Satellite