NASA Photo ID: S90-36705 File Name: 10064005.jpg Film Type: 4x5 CN Date Taken: 05/07/90 Title: STS-37 Gamma Ray Observatory (GRO) at KSC Payload Hazardous Servicing Fac Description: At the Kennedy Space Center (KSC) Payload Hazardous Servicing Facility, the overhead crane lifts the Gamma Ray Observatory (GRO) from its storage container. GRO, one of four NASA Great Observatories, arrived at KSC on 02-06-90 from the California plant of builder TRW. Weighing a massive 34,700 pounds, GRO will be the heaviest payload without an upper stage ever carried aboard the Space Shuttle. It is scheduled for deployment from Atlantis, Orbiter Vehicle (OV) 104, during STS-37.