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Lightning over the Kennedy Space Center's Launch Pad 39A competes with the xenon lights on the pad illuminating space shuttle Discovery waiting for a scheduled liftoff on the STS-128 mission. Launch was scrubbed due to the weather and another launch attempt is scheduled for Aug. 28. Discovery's 13-day mission will deliver more than 7 tons of supplies, science racks and equipment, as well as additional environmental hardware to sustain six crew members on the International Space Station. The equipment includes a freezer to store research samples, a new sleeping compartment and the COLBERT treadmill. The mission is the 128th in the Space Shuttle Program, the 37th flight of Discovery and the 30th station assembly flight.