Astronauts John M. Grunsfeld (right, partially obscured), Michael J. Massimino (third right, partially obscured) and Andrew J. Feustel (left foreground), 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.
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Johnson Space Center
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NASA
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Astronauts John M. Grunsfeld (right, partially obscured), Michael J. Massimino (third right, partially obscured) and Andrew J. Feustel (left foreground), 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.