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KENNEDY SPACE CENTER, FLA. -- The Pegasus barge, at right, is towed toward the landing dock in the Launch Complex 39 Area. The barge carries external tank No. 120, to be used for launching Space Shuttle Discovery on mission STS-120 in October. At left is the Vehicle Assembly Building. The barge has carried the tank from the Michoud Assembly Facility near New Orleans, making the journey around the Florida peninsula in tow by the JA Bisso II tugboat, to Port Canaveral and Kennedy Space Center. After the tank is offloaded, it will be towed to the Vehicle Assembly Building for lifting into a checkout cell. NASA/Amanda Diller