Space Shuttle Discovery Continues On Its Last Mission
(credit: NASA via Getty Images)
In this handout image provided by NASA, NASA astronaut Alvin Drew participates in the mission's first session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station February 28, 2011 in Space. During the six-hour, 34-minute spacewalk, Steve Bowen and Drew 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. Discovery, on its 39th and final flight, is carrying the Italian-built Permanent Multipurpose Module (PMM), Express Logistics Carrier 4 (ELC4) and Robonaut 2, the first humanoid robot in space to the International Space Station.