OTD…April 29 and STS-51B

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 1992…Atlantis launched to test the Tethered Satellite System

#OTD in 1999…Columbia launched with the first woman commander and the Chandra X-ray Observatory