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1 Comment
GeeSussFreeKhttp://en.wikipedia.org/wiki/RL-10

I have googled it for you
From other sources
"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."
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