The launch of space shuttle Discovery has been put off at least a week from its February 12 target so that NASA engineers can look at a potential problem with fuel valves. The valves regulate the flow of fuel between the shuttle's main engines and the external fuel tank during ascent to orbit. NASA maintains it's not a big concern, and the delay is out of an abundance of caution.
The key task of Discovery's mission will be the delivery to ISS of the station's final set of solar power arrays.
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