NASA has neither found nor fixed the fuel sensor fault that halted the launch of the Space Shuttle Discovery two weeks ago. So it's turning to the ultimate test: setting another launch in motion, planned for mid-morning Tuesday.
The Discovery mission will be the first space shuttle flight since the fatal 2003 Columbia accident, in which the crew was killed upon re-entering the Earth's atmosphere.
NASA managers say that Tuesday's launch, scheduled for 10:39 a.m. ET, will go ahead even if a fuel-sensor glitch — which forced the cancellation of Discovery's launch two weeks ago — is again detected.