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NASA has announced that the next launch attempt for the space shuttle Discovery will be no earlier than 12:22 am Friday, August 28th at NASA’s Kennedy Space Center in Cape Canaveral, Florida.

Wednesday's launch attempt was postponed after an indication that a valve in the shuttle's main propulsion system failed to perform as expected during fueling of the shuttle's external fuel tank. NASA managers officially postponed Wednesday's launch attempt because of uncertainty about whether a valve that was commanded to be closed actually was closed. The valve is associated with the fill and drain plumbing of the main propulsion system within the shuttle's aft compartment.