Re: Could it be VASIMR? Let's hope so
Given a few megawatts from a fission reactor VASIMR is a much better candidate than the H2 heating rockets. True, we actually BUILT working H2 heating rocket engines back in the 1960s - NERVA, but the ISP (specific impulse) from VASIMR is so much greater. Translates into bigger payloads and/or much faster travel times to places like Mars.