Don’t confuse nuclear fission rocket with nuclear submarine

One must not confuse the direct nuclear fission rocket drive with the use of nuclear fission as in a submarine. The trouble with the nuclear fission rocket direct drive is the astronauts
are going to freeze their ass after That rocket is shut off. It only fires a few minutes. Then what? If no internal heating, that at Jupiter distance the breathing air will turn into liquid within the spaceship. internal temperatures dropping below minus 250 degrees sub zero.

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