"The Common Extensible Cryogenic Engine, or CECE, is a deep-throttling engine, which means it has the flexibility to reduce thrust from 100 percent down to 10 percent -- allowing a spacecraft to gently land on the lunar surface. The 13,800-pound thrust engine uses extremely cold liquid oxygen and liquid hydrogen as propellants. "
NASA Tests Engine Technology for Landing Astronauts on the Moon
http://www.nasa.gov/mission_pages/constellation/news/cece.html
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