Why don't modern spacecraft use nuclear power?

Why don't modern spacecraft use nuclear power?

Most if not all of modern submarines are powered by a nuclear reactor. At sea, only the most heavyweight (like air-carriers) use a nuclear reactor. But I have never heard of nuclear-powered aircraft, rover, or satellite, not even as an experiment. Ar they so costly, or dangerous to be used in space?

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Answers (3)

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RoseHeart
Cause if the rockets explode then we would all be covered in radiation ad there is a possibility that we die well someone would die
on August 15, 2014
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Mataways
They will.
21 days ago
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Nightcat
I think they're too heavy, hydrogen is the lightest gas in the universe (that we know) so it's easier to use it with oxygen. And nuclear power produces radiation, which is hard to dispose of in space.
on August 16, 2014
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