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Courtesy of National Geographic's web site, here's something you probably didn't know about the Ares I-X:
Isn't it cool how NASA made the "four solid rocket boosters adapted from an Atlas V rocket" look just like a shuttle's SRB? What's the extra motor do?

For the record, the Ares I-X is using a four-segment solid rocket motor from the shuttle, not four motors from an Atlas. It is using avionics hardware from the Atlas V, though.
-- Roger
The Ares I-X test rocket is similar in size and mass to the real deal. But only the first stage includes working hardware: four solid rocket boosters adapted from an Atlas V rocket, a motor, and a set of newly designed parachutes.
Isn't it cool how NASA made the "four solid rocket boosters adapted from an Atlas V rocket" look just like a shuttle's SRB? What's the extra motor do?
For the record, the Ares I-X is using a four-segment solid rocket motor from the shuttle, not four motors from an Atlas. It is using avionics hardware from the Atlas V, though.
-- Roger