Space Shuttle Discovery Ready for Lift off

Space shuttle Discovery is in the final stages of preparation before its flight to the International Space Station from NASA's Kennedy Space Center in Florida.

Fueling of Discovery's external tank with 500,000 gallons of super-cold liquid oxygen and hydrogen is scheduled to begin at 4:11 p.m. EDT, depending on weather conditions at the time.

The "topping off" of propellants into the tank will continue until Discovery's liftoff. All systems aboard the shuttle are functioning normally and no issues are being reported.

Weather continues to be 80 percent acceptable for a 1:36 a.m. Tuesday launch.

Coverage of Discovery's liftoff on the STS-128 mission begins Monday at 8:30 p.m. Follow the countdown with NASA's launch blog and live commentary broadcast on NASA TV.