Quantcast
Last updated on April 16, 2014 at 17:34 EDT
428 of 1107

August 13, 2012
NASA astronaut Chris Ferguson, STS-135 commander, sits in a hyperbaric chamber as he undergoes high altitude training March 10, 2011 at the Sonny Carter Training Facility near the Johnson Space Center in Houston. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool