OTD…Sept. 20 and Endeavour retirement

#OTD…Launch of Discovery in 1990 with the Hubble Space Telescope, our window on the universe!

#OTD in 1995…Columbia launched on a microgravity science Spacelab flight

A five-week, 5,000-mile sea trek of the last space shuttle external fuel tank pulled into port today for a parade through the urban jungle of Southern California on Saturday to its final destination.