KENNEDY SPACE CENTER, FLA. -In the Vehicle Assembly Building at NASA’s Kennedy Space Center, the newly installed liquid oxygen bellows heater is seen on External Tank 120 (at left, behind it), recently removed from the orbiter Discovery. The new heater has been added to the feedline bellows to minimize the potential for ice and frost buildup. ET-120 will fly with Atlantis on the second Return to Flight mission STS-121. The launch window for STS-121 extends from Sept. 9 - 24.

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