The launch team reports that the fuel and oxygen tanks for the United Launch Alliance Atlas V booster and Centaur upper stage are at flight level with pumps providing just enough propellant to replace what boils off during the countdown. The Atlas V first stage burns refined kerosene and liquid oxygen to produce about 933,000 pounds of thrust with its RD-180 engine. The Centaur uses an RL-10 engine that burns liquid hydrogen and liquid oxygen. Both liquid hydrogen and liquid oxygen are cryogenic propellants, meaning they are super-cold. The liquid hydrogen is minus-423 F and the liquid oxygen is minus-297 degrees.
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