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A comment on NASA, DARPA Will Test Nuclear Engine for Future Mars Missions. Parent comment

Re:NASA, DARPA Will Test Nuclear Engine for Future Mars Miss... by dmitrybrant on Tuesday January 24, 2023 @10:21PM (#34513983)
> without an action-reaction process. Just an energy source, and no propellant.

Unfortunately, in our universe, momentum is conserved.

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Re:NASA, DARPA Will Test Nuclear Engine for Future Mars Miss... by mr_toad on Wednesday January 25, 2023 @12:38AM (#34514820)
If you could somehow convert mass into a beam of photons then the mass loss would be tiny compared to the momentum.
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