An orbital sunrise brightens this view of space shuttle Discovery's vertical stabilizer, orbital maneuvering system (OMS) pods, docking mechanism, remote manipulator system/orbiter boom sensor system (RMS/OBSS) and payload bay in this photo provided by NASA and taken March 7, 2011. Astronauts aboard the space shuttle Discovery prepared on Tuesday to bring NASA's most-traveled spacecraft back to Earth, wrapping up its 39th and final mission.