On this date…April 16 and Apollo 16

Today in 2011, shuttle Discovery made a graceful landing at Kennedy Space Center, returning from her final voyage after a remarkable three-decade life of service.

#OTD in 1993…Endeavour launched a new NASA Tracking and Data Relay Satellite.

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