The Ares 1 rocket is unique in the fleet of manned space vehicles because it consists of a single, solid rocket first stage and a liquid fueled upper stage. The Ares 1-X has an inert second stage to simulate the shape and weight of the operational version. The pairing of the solid 1st stage and liquid upper stage makes the rocket smaller on the bottom and larger on the top. -a unique look for a manned vehicle.
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