JSC2007-E-27768 (6 June 2007) --- Astronauts Andrew J. Feustel (foreground), Michael J. Massimino (right) and John M. Grunsfeld (out of frame), STS-125 mission specialists, participate in a training session with a Hubble Space Telescope mockup in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.
Photographer Robert Markowitz