Space shuttle Discovery rolls away from the Orbiter Processing Facility on its orbiter transporter at NASA's Kennedy Space Center.

Space shuttle Discovery rolls away from the Orbiter Processing Facility on its 76-wheeled orbiter transporter to make the short trip to the Vehicle Assembly Building, or VAB, at NASA's Kennedy Space Center. The transporter is 106.5 feet long. In high bay 3 of the VAB, Discovery will be attached to its external fuel tank and solid rocket boosters in preparation for its upcoming STS-124 mission to the International Space Station. On the mission, the STS-124 crew will transport the Japanese Experiment Module - Pressurized Module and the Japanese Remote Manipulator System to the space station. Launch of Discovery is targeted for May 31. Photo credit: NASA/Troy Cryder