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Yes, the RS-25/SSMEs aren't "easily the most efficient rocket engines ever built". As noted below, there's NERVA.
by termain 12y ago
Yes, the RS-25/SSMEs aren't "easily the most efficient rocket engines ever built". As noted below, there's NERVA.
- pavel_lishin 12y agoAnd yesterday's launch illustrates why people are kind of nervous about using them as a way to take off from the planet's surface.