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The Pegasus barge carrying the external tank for space shuttle Atlantis' STS-125 mission to NASA's Hubble Space Telescope is tied to the dock in the turn basin in the Launch Complex 39 Area of NASA's Kennedy Space Center. The tank will offloaded and moved to the Vehicle Assembly Building. Once inside the building, the tank will be raised to vertical, lifted and moved into a checkout cell. Stacking of the tank and solid rocket boosters is planned to start Aug. 7. Atlantis is targeted to launch Oct. 8.