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shashankac655
I read that nuclear power when used for propulsion of a vehicle can be very efficient for example nuclear powered submarines and aircraft carriers can run over twenty years without refueling and can travel enormously long distances with the fission of a few kilograms of uranium,but why is this source of power not used for space exploration,is not possible to use nuclear energy to send spacecraft s(maybe with human crew),at much greater speeds and to much far away destinations??