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KENNEDY SPACE CENTER, FLA. -- In high bay 3 of NASA's Vehicle Assembly Building, Discovery's external tank and solid rocket boosters are being mated with the orbiter atop the mobile launcher platform. Space Shuttle Discovery is expected to roll out to Launch Pad 39B later this week via the crawler-transporter. Launch of Discovery on mission STS-121 is scheduled to take place in a window extending July 1 to July 19. Photo credit: NASA/Jim Grossmann