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CAPE CANAVERAL, Fla. -- In the Vehicle Assembly Building at NASA's Kennedy Space Center, workers track the movement of space shuttle Discovery's external tank as it is lowered into high bay 3 between the solid rocket boosters waiting on the mobile launcher platform. The tank and rockets will be mated for the launch of Discovery on the STS-124 mission to the International Space Station, targeted for May 31. On the mission, Discovery will transport the Kibo Japanese Experiment Module - Pressurized Module (JEM-PM) and the Japanese Remote Manipulator System (JEM-RMS) to the space station to add to the Kibo laboratory. Photo credit: NASA/Kim Shiflett