- --- Solid Core NTR, low range, not super effective, mediocre thrust
- --- Liquid/Vapor Core NTR, low-mid range, a step above solid core ntr
- --- Closed Cycle Gas Core NTR - mid range, good isp and thrust
- --- Open-Cycle Gas Core NTR - mid-high range, very good isp and thrust
- --- Nuclear Salt Water Rocket - high range, fantastic isp and thrust, very costly and dangerous
- --- Fission Fragment - high range, pathetic thrust but unequalled isp, very very costly and only used on unmanned probes really
- --- Atomic Fizzer - high range, unequivocally ludicrous thrust, only used on highly advanced missiles
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