NASA - National Aeronautics and Space Administration

S133-E-011802 (7 March 2011) --- NASA astronauts Steve Lindsey (left), STS-133 commander; and Eric Boe, pilot, occupy their respective stations on the forward flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011803 (7 March 2011) --- NASA astronauts Steve Lindsey (left), STS-133 commander; and Eric Boe, pilot, are pictured at their respective stations on the forward flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011806 (7 March 2011) --- NASA astronauts Steve Lindsey (left), STS-133 commander; and Eric Boe, pilot, are pictured at their respective stations on the forward flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011808 (7 March 2011) --- NASA astronaut Alvin Drew, STS-133 mission specialist, is pictured on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011870 (7 March 2011) --- Layers of Earth's atmosphere, brightly colored as the sun rises, are featured in this image photographed by an STS-133 crew member on space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011312 (7 March 2011) --- NASA astronauts Steve Lindsey (right), STS-133 commander; and Alvin Drew, mission specialist, are pictured on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011313 (7 March 2011) --- NASA astronaut Alvin Drew, STS-133 mission specialist, works the controls for the remote manipulator system (RMS) on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011314 (7 March 2011) --- NASA astronaut Alvin Drew, STS-133 mission specialist, works the controls for the remote manipulator system (RMS) on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011315 (7 March 2011) --- NASA astronaut Steve Lindsey, STS-133 commander, works the controls for the remote manipulator system (RMS) on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration

S133-E-011316 (7 March 2011) --- NASA astronaut Eric Boe, STS-133 pilot, is pictured on the aft flight deck of space shuttle Discovery during flight day 12 activities. Photo credit: NASA or National Aeronautics and Space Administration