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October 31, 2011
STS-125 crewmembers participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at Johnson Space Center. The facility includes moving scenes of full-sized Hubble Space Telescope components over a simulated Earth. Pictured are astronauts Andrew J. Feustel (foreground), Michael T. Good, both mission specialists; and Scott D. Altman, commander.