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KENNEDY SPACE CENTER, FLA. -- In a perfect on-time launch at 7:17 p.m. EDT, Space Shuttle Discovery leaps free of Earth as its solid rocket boosters hurl it into the night sky. The launch of mission STS-92 carries a crew of seven on a construction flight to the International Space Station. Discovery also carries a payload that includes the Integrated Truss Structure Z-1, first of 10 trusses that will form the backbone of the Space Station, and the third Pressurized Mating Adapter that will provide a Shuttle docking port for solar array installation on the sixth Station flight and Lab installation on the seventh Station flight. Discovery’s landing is expected Oct. 22 at 2:10 p.m. EDT