NASA and DARPA want to build a nuclear-powered spaceship
Briefly

The first astronauts who venture to Mars may make at least one leg of the trip on nuclear power, if NASA and DARPA succeed in their most recent joint venture.DARPA wants a rocket that will let it maneuver its hypothetical spacecraft freely and quickly in space around Earth.NASA wants a rocket that can get astronauts to and from Mars faster and with less fuel.
Read at Inverse
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