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Nuclear reactors almost small enough to make it feasible (but not a good idea) have been created before. TOPAZ and SNAP-10A from the 60s and 70s come to mind.

Nuclear reactors almost small enough to make it feasible (but not a good idea) have been created before. TOPAZ and SNAP-10A from the 60s and 70s come to mind. A TOPAZ-I reactor weighing 320kg and could produce 5kW for 3-5 years. That's not good enough for a car, but I think it's impressive nevertheless. https://en.wikipedia.org/wiki/SNAP-10A#/media/File:SNAP_10A_Space_Nuclear_Power_Plant.jpg https://en.wikipedia.org/wiki/SNAP-10A#/media/File:SNAP_10A_... https://en.wikipedia.org/wiki/TOPAZ_nuclear_reactor https://en.wikipedia.org/wiki/TOPAZ_nuclear_reactor

acidburnNSA 6y ago
Things are either forbidden by the laws of physics or possible, so yeah it is physically feasible. But it is not within the bounds of reality because the cores for those two reactors are millions of dollars and the weights don't include the shielding necessary to operate without dying. Those space reactors are indeed awesome. Nuclear has a rich future in space in almost all possible scenarios where humans continue to exist.