NASA developing first nuclear-electric interplanetary spacecraft — how NEP differs from Voyager's RTGs
NASA is developing the first nuclear-electric interplanetary spacecraft, using a fission reactor to generate sustained electrical power for high-efficiency electric thrusters. Unlike Voyager's radioisotope thermoelectric generators (RTGs), which supply low-level instrument power, nuclear-electric propulsion provides continuous high-power thrust for extended deep-space maneuvers.