NASA - National Aeronautics and Space Administration

S134-E-011090 (27 May 2011) --- NASA astronaut Michael Fincke participates in the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. Photo credit: NASA

S134-E-011104 (27 May 2011) --- NASA astronaut Michael Fincke participates in the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. Photo credit: NASA

S134-E-011112 (27 May 2011) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, uses a communication system while looking through an overhead aft flight deck window of space shuttle Endeavour while docked with the International Space Station on flight day 12. Photo credit: NASA

S134-E-011116 (27 May 2011) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, is pictured on the aft flight deck of space shuttle Endeavour while docked with the International Space Station on flight day 12. Photo credit: NASA

S134-E-011117 (27 May 2011) --- NASA astronaut Mark Kelly, STS-134 commander, looks through an overhead window on the aft flight deck of space shuttle Endeavour while docked with the International Space Station on flight day 12. Photo credit: NASA

S134-E-011211 (27 May 2011) --- NASA astronaut Michael Fincke participates in the mission's fourth session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the seven-hour, 24-minute spacewalk, Fincke and astronaut Greg Chamitoff (out of frame), both STS-134 mission specialists, completed the primary objectives for the spacewalk, including stowing the 50-foot-long boom and adding a power and data grapple fixture to make it the Enhanced International Space Station Boom Assembly, available to extend the reach of the space station's robotic arm. Photo credit: NASA

S134-E-009505 (27 May 2011) --- This is a view of the night sky of the Southern Hemisphere just off the port wing of Endeavour as the shuttle/space station tandem track northeastward over the South Atlantic Ocean about 1400 miles southeast of Rio de Janeiro, Brazil. The faint "airglow" of the Earth's atmosphere is visible just left of the wing. Photo credit: NASA

ISS028-E-005910 (27 May 2011) --- NASA astronaut Greg H. Johnson (left), STS-134 pilot; along with Russian cosmonauts Andrey Borisenko (center), Expedition 28 commander; and Alexander Samokutyaev, Expedition 28 flight engineer, pose for a photo on the middeck of space shuttle Endeavour while docked with the International Space Station.

ISS028-E-005912 (27 May 2011) --- NASA astronauts Greg H. Johnson (top), STS-134 pilot; and Andrew Feustel, mission specialist, share a meal with their shuttle and station crewmates on the middeck of space shuttle Endeavour while docked with the International Space Station.

ISS028-E-005913 (27 May 2011) --- NASA astronaut Greg H. Johnson, STS-134 pilot, enjoys a meal on the middeck of space shuttle Endeavour while docked with the International Space Station.