OTD…Jan. 22 and STS-42

#OTD in 2012…Endeavour’s coast-to-coast ferryflight into retirement arrives at Edwards Air Force Base

#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 in 1984…Challenger launched the Earth Radiation Budget Satellite