The space shuttle Discovery is about to make its second launch attempt in two weeks for what may be the most scrutinised mission ever.
The mission will test safety measures brought in after the Columbia accident in 2003.
Discovery was prevented from blasting off on 13 July due to a fuel sensor glitch which remains unresolved.
Lift-off is scheduled for 1039 local time (1439 GMT) from Nasa's Kennedy Space Center in Florida.
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