OTD…June 17 and STS-51G

#OTD in 1985…Challenger suffered an engine shutdown on her way to orbit for a Spacelab mission

OTD in 1969…The launch of Apollo 11 for the first human landing on the moon

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