With the capability of generating high thrust and 100% more specific impulse than the best chemical rockets, the time and cost-saving potential of nuclear thermal rockets (NTR) for deep-space missions is once again gaining interest at NASA. Although never flown, the NTR concept is relatively simple. The rocket engine is based around a nuclear fission reactor, which heats the liquid hydrogen (LH2) propellant instead of igniting combustible fuel.The idea goes back to the earliest days of the ...

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