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Why do spacecrafts not use nuclear fission for power?

Question by : Why do spacecrafts not use nuclear fission for power?
Couldn’t nuclear energy greatly increase the speed and power of a space craft?
@anonymous – what does mass have to do with anything if your are in a no gravity environment? Mass in terms of weight is only an issue in environments with gravity. A space craft using nuclear energy would need to be kept in space at all times obviously.

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