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Nuclear rockets could travel to Mars in half the time − but designing the reactors that would power them isn't easyNuclear thermal propulsion systems have roughly twice the specific impulse of chemical rockets, which means they could cut the travel time by a factor of 2. But these pre-1973 designs relied on ...
Beamed Power Propulsion (e.g., Laser Thermal Rocket) Description: An external power source ... yielding >2 m/s² for large ships). Beamed Ion: High specific impulse (5,000–10,000 s, or 50–100 km/s ...
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