At NASA's Kennedy Space Center in Florida, space shuttle Discovery is being readied for its STS-124 mission, currently targeted for launch May 31.

Inside the orbiter processing facility, shuttle workers are preparing for the orbiter's April 26 move to the Vehicle Assembly Building, where it will be joined with its external tank and solid rocket boosters. Rollout of the entire space shuttle assembly to Launch Pad 39A is set for May 3.

STS-124 is the second of three flights to deliver the Japan Aerospace Exploration Agency's Kibo laboratory to the International Space Station. At 37 feet long and 14 feet wide, the Japanese Pressurized Module will be the station's largest science laboratory. The shuttle also will deliver the lab's robotic arm system that supports operations outside of Kibo. The lab's logistics module, which was installed in a temporary location during STS-123 in March, will be attached to the new lab.