RT @NASAhistory: #OTD in 1991, STS-37 (Atlantis) landed @EdwardsAFB .
Deployed the Compton Gamma Ray Observatory. https://t.co/bvSMoDMBg4
RT @NASAhistory: #OTD in 1991, STS-37 (Atlantis) landed @EdwardsAFB .
Deployed the Compton Gamma Ray Observatory. https://t.co/bvSMoDMBg4