OTD…July 23 and STS-93

#OTD in 1993…Endeavour launched a new NASA Tracking and Data Relay Satellite.

#OTD in 2007…NASA’s Dawn probe launched to explore the uncharted worlds of Vesta and Ceres in the heart of the asteroid belt.

#OTD…Launch of Columbia in 1993 on the second flight of the German Spacelab