NASA astronauts Alvin Drew and Steve Bowen STS-133 mission specialists continue on the International Space Station.

NASA astronauts Alvin Drew and Steve Bowen (mostly obscured at center), both STS-133 mission specialists, participate in the mission?s first session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 34-minute spacewalk, Drew and Bowen installed the J612 power extension cable, move a failed ammonia pump module to the External Stowage Platform 2 on the Quest Airlock for return to Earth at a later date, installed a camera wedge on the right hand truss segment, installed extensions to the mobile transporter rail and exposed the Japanese ?Message in a Bottle? experiment to space. Photo credit: NASA or National Aeronautics and Space Administration