OTD…Sept. 21 and Endeavour retirement

Neil Armstrong, Buzz Aldrin and Michael Collins launched today in 1969 aboard Apollo 11 for one of the defining moments of the 20th century — man’s first 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.

Today in 1986…Space shuttle Challenger and her seven astronaut crew were lost during launch.