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KENNEDY SPACE CENTER, FLA. -- The open doors of Space Shuttle Discovery’s payload bay show the two elements to be added to the International Space Station on mission STS-92. At top is the third Pressurized Mating Adapter; below it is Integrated Truss Structure Z-1, the cornerstone truss of the Station. Making the 100th Space Shuttle mission launched from Kennedy Space Center, Discovery also will be making its 28th flight into space. On the 11-day mission, the crew of seven will be making four space walks to attach the hardware to the Station. l Space Station. The payload also includes the Integrated Truss Structure Z-1. During the 11-day mission, four extravehicular activities (EVAs), or space walks, are planned