NASA - National Aeronautics and Space Administration

The J-2X is an evolved version of two historic predecessors: the powerful J-2 engine that propelled the Apollo-era Saturn IB and Saturn V rockets, and the J-2S, a simplified version of the J-2 that was developed and tested in the early 1970s. The J-2X engine will incorporate significant upgrades to meet higher performance and reliability requirements for the Ares vehicles.

Image credit: NASA

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