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In addition to the good answers above, I'd like to add a point about the nuclear reactor losing mass. It's true, it does, albeit at a really tiny rate. The reason that this doesn't contribute to propulsion is that the mass is loss in all directions so the net effect is zero.


No, This device would just oscillate (vibrate) When the first two electromagnets switched on the metal ball (which is presumably made out of a ferromagnet) would accelerate towards them but the craft would also accelerate towards the ball (At a lower acceleration as it has more mass). It would then switch to the next electromagnet pair and do the same ...

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