Discovery Launch Scrubed due to stuck Valve

Discovery sits at Pad 39-A this evening following the scrub.

Launch control at the Kennedy Space Center stopped fueling the space shuttle's fuel tank late today and canceled tonight's launch attempt of Discovery due to a fuel valve which would not close.

"A problem cropped up with a fill-and-drain valve in the bottom part of the shuttle, the aft part of the shuttle, related to the liquid hydrogen," NASA launch commentator Allard Beutel stated as the scrub was official.

As of tonight, launch would occur no earlier than this Friday morning at 12:22:07 am EDT.