#OTD…Gamma Ray Observatory launched in 1991 on Atlantis and Discovery’s 2010 ISS flight
Related Articles
OTD…April 17 and STS-90
April 17, 2015
On this date…Crew launched to fix Skylab
May 25, 2016
OTD…July 8 and STS-65 and STS-135
July 8, 2015