Astronaut Richard Arnold a mission specialist arrives at NASA's Kennedy Space Center to prepare for launch.

Astronaut Richard Arnold, a mission specialist for space shuttle Discovery's STS-119 mission, arrives at NASA's Kennedy Space Center in Florida to prepare for launch. STS-119 is the 125th space shuttle flight and the 28th flight to the International Space Station. Discovery and its crew will deliver the final set of large power-generating solar array wings and integrated truss structure, S6, to the space station. The mission includes four spacewalks. Launch is scheduled for March 11 at 9:20 p.m. EDT. Photo credit: NASA/Kim Shiflett