KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility bay 1 at NASA’s Kennedy Space Center in Florida, Atlantis’ nose wheels are cycled to test compression of the new Thermal Protection System seal. Processing continues on Atlantis for mission STS-121 to the International Space Station. The second Return to Flight mission, STS-121 is scheduled for liftoff in a launch window extending from Sept. 9 - 24.

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