When all is said and done, NASA's Constellation project to return to the Moon and go on to Mars will achieve remarkably little. Now the agency plans to undo one of the few decisions where Constellation got it right-the use of RS-68 engines on the Ares 5 heavy-lift vehicle. As originally conceived, Constellation was a very good idea. Rather than go out on another expensive, new-technology limb that had no economic or practical reason to exist - another National Aero-Space Plane or X-33-we would use the launch vehicles and technology we already have.
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