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Stage 2 Centaur

Fuel and oxidizer and the vehicle's "brains"; fires twice, once to insert the vehicle-spacecraft stack into low Earth orbit and then again to accelerate the spacecraft out of Earth orbit and on its way towards Mars

Two interstage adaptors connect the first stage of the Atlas with its Centaur upper stage. The Centaur's has a restartable RL-10 engine from Pratt & Whitney Rocketdyne. This engine uses liquid hydrogen and liquid oxygen and can provide up to about 22,300 pounds (99,200) of thrust. The Centaur can control its orientation precisely, which is important for managing the direction of thrust while its engine is firing. It carries its own flight control computer and can release its payload with the desired attitude and spin rate.

At Launch Complex 41 at Cape Canaveral Air Force Station in Florida, workers guide an overhead crane as it lifts the Centaur upper stage for the United Launch Alliance Atlas V in the Vertical Integration Facility (VIF).
Centaur at Pad 41
With a unique view taken from inside Vertical Integration Facility (VIF) at Launch Complex 41 at Cape Canaveral Air Force Station in Florida, an overhead crane lifts the Centaur upper stage for the United Launch Alliance Atlas V.
Centaur Upper Stage Rises
At Launch Complex 41 at Cape Canaveral Air Force Station in Florida, an overhead crane will be used to lift the Centaur upper stage for the United Launch Alliance Atlas V into the Vertical Integration Facility (VIF).
Centaur Upper Stage Rocket Arrives at KSC

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