NASA on Thursday put off the planned launch of the space shuttle Discovery for a third time to give engineers more time to study tests on a liquid hydrogen valve, the space agency announced. The shuttle’s liftoff — originally set for Tuesday — has been put off until 11:59 p.m. Friday, mission managers said.
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Shuttle Discovery set for nighttime launch
Space shuttle Discovery was scheduled to launch early Tuesday morning for a mission to deliver equipment to the international space station.