Space rockets may soon use nuclear-powered engines based on nuclear thermal propulsion, or NTP technology. While no nuclear engine will fly this year, the field is approaching a major milestone, with ...

UK space propulsion company Pulsar Fusion has conducted the first test of a prototype exhaust system for a nuclear fusion rocket engine that could dramatically cut transit times for missions to Mars ...

In the context of this conversation we're talking about thermonuclear explosions in space for power generation, not propulsion. So it being heavy is fine. Orion was meant to be propulsive so that ...