Activities in the Spacelab Mission Operations Control facility at the Marshall Space Flight Center (MSFC) are shown in this photograph. All NASA Spacelab science missions were controlled from and the science astronauts were supported by this facility during the missions. Teams of flight controllers and researchers at the MSFC Space Mission Operations Control Center directed all NASA science operations, sent commands directly to the crew of Spacelab, and received and analyzed data from experiments on board the Spacelab. The facility used the air/ground communications charnels between the astronauts and ground control teams during the Spacelab missions. Spacelab science operations were a cooperative effort between the science astronaut crew in orbit and their colleagues in the Space Mission Operations Control Center. Though the crew and the instrument science teams were separated by many miles, they interacted with one another to evaluate observations and solve problems in much the same way as they would when working side by side in a ground-based laboratory. Most of the action was centered in two work areas: The payload control area from which the overall payload was monitored and controlled and the science operations area where teams of scientists monitored their instruments and direct experiment activities. This facility is no longer operational since the last Spacelab mission, U.S. Microgravity Payload-4 in December 1997, and has become one of the historical sites at MSFC. The facility was reopened as the International Space Station Payload Operations Center in March 2001.