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Feasability of miniature nuclear reactors for humanoid cyborgs

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The idea is to build a cybernetic body for a human. Only the brain and a few glands related to emotions, like adrenal glands, will be kept. The brain and the glands will be in a closed, plug-and-play, container, that can be connected to compatible bodies, to turn humans into cybernetic space elves capable of living long enough to cross the void between the stars without relying on relativistic ships (assume for now that it is possible to keep the brain healthy for thousands of years with the correct chemistry).

But these bodies need power sources. Compact, energetic power sources. I'm thinking fission reactors.

Is it possible to build a fission reactor so small that can be possible to fit it in a human chest cavity? Would such a miniaturized reactor be better, in terms of power output and autonomy, then a combustion engine or batteries?

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This post was sourced from https://worldbuilding.stackexchange.com/q/143584. It is licensed under CC BY-SA 4.0.

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