STS_135_VR

NASA astronaut Rex Walheim, STS-135 mission specialist, simulates a space walk in the Virtual Reality Laboratory at the Johnson Space Center on Friday, May 13, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool ).

JSC2011-E-059397 (13 May 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, simulates a spacewalk in the Virtual Reality Laboratory at NASA?s Johnson Space Center May 13, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

Photographer Smiley N. Pool
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