OTD…Sept. 21 and Endeavour retirement

#OTD in 2012…Journey of shuttle Endeavour through Los Angeles begins

#OTD in 1990…Columbia launched to retrieve NASA’s Long duration Exposure Facility (LDEF) on the longest Shuttle flight to date.

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