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JSC2009-E-072670 (9 April 2009) --- Astronauts Andrew Feustel (bottom), John Grunsfeld (center left), Mike Massimino and Michael Good (center, right), all STS-125 mission specialists, work with a Hubble Space Telescope mock-up during a spacewalk training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Tomas Gonzalez-Torres, STS-125 lead spacewalk officer, and United Space Alliance instructor Christy Hansen (mostly obscured) assisted the crewmembers.
