Workers help guide the Multi-Purpose Logistics Module Leonardo as it is lowered toward the weight and balance scale.

Workers in the Space Station Processing Facility help guide the Multi-Purpose Logistics Module Leonardo as it is lowered toward the weight and balance scale. The Italian-built MPLM is one of three such pressurized modules that will serve as the International Space Station's "moving vans," carrying laboratory racks filled with equipment, experiments and supplies to and from the station aboard the Space Shuttle. The cylindrical module is approximately 21 feet long and 15 feet in diameter, weighing almost 4.1 metric tons. It can carry up to 9.1 metric tons of cargo packed into 16 standard space station equipment racks. The Leonardo will be launched on mission STS-102 March 8. On that flight, Leonardo will be filled with equipment and supplies to outfit the U.S. laboratory module, to be carried to the ISS on the Feb. 7 launch of STS-98