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NASA’s lithium-fed magnetoplasmadynamic (MPD) thruster prototype reached a peak of 120 kilowatts in a ground test—an electric-propulsion power milestone, not proof of an engine ready to take astronauts to Mars. NASA’s headline calls it an “ion thruster,” but the prototype is specifically an MPD thruster, a different electric-propulsion architecture from the Hall-effect and gridded-ion systems often meant by that label.
What record did NASA’s thruster break?
NASA reported that the prototype reached 120 kilowatts during a test on February 24, 2026, at the Jet Propulsion Laboratory’s Electric Propulsion Lab. NASA characterized this as the first time an electric-propulsion system in the United States had operated at such a high power level. The 120-kW figure is the test’s peak power; it is not a reported thrust, efficiency, specific impulse, or travel-time result. (NASA, April 28, 2026)
NASA compared the test power with the electric thrusters on its Psyche spacecraft, saying it was more than 25 times greater. That comparison is about power, not a direct measure of propulsion performance: Psyche’s solar-electric thrusters are operating in space, while the lithium-fed MPD prototype was fired on the ground. (NASA, April 28, 2026)
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How does a magnetoplasmadynamic thruster work?
The prototype uses lithium metal vapor as propellant. High electrical currents interact with a magnetic field to accelerate the resulting lithium plasma electromagnetically, producing thrust. Electric propulsion generally generates low, sustained thrust rather than the brief, powerful push of a chemical rocket; over time, that thrust can build spacecraft speed. The detailed architecture and demonstrated performance of this MPD prototype should not be assumed to match solar-powered xenon Hall or gridded-ion thrusters. NASA’s propulsion reference identifies Hall-effect thrusters as one form of ion propulsion, but this prototype is not a Hall thruster. (NASA, April 28, 2026; NASA, Solar Electric Propulsion; NASA Small Spacecraft Systems Virtual Institute, In-Space Propulsion)
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Power alone does not establish how much thrust a thruster produces or how effectively it uses energy and propellant. NASA’s announcement gives no thrust, efficiency, or specific-impulse value for this prototype, so those performance measures—and a Mars transit time—cannot be inferred from the 120-kW figure.
Could this thruster take humans to Mars?
It is a possible technology for future human Mars missions, not a flight-ready engine. NASA says MPD thrusters have never flown operationally and require further development. The contemplated Mars application would pair them with a nuclear power source; the current test was of a ground-based thruster prototype, not a complete nuclear-electric spacecraft or a selected crewed mission. JPL says substantial development remains before the technology could be used in space. (NASA, April 28, 2026; JPL, April 28, 2026)
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NASA’s planning figures show the scale of the work ahead, rather than what the prototype has achieved:
| Figure | What it describes |
|---|---|
| 500 kW to 1 MW per thruster | The team’s future target for individual thrusters, according to NASA. |
| 2 to 4 MW | NASA’s estimated power need for a possible human Mars mission. |
| More than 23,000 hours | NASA’s estimate of thruster operating time in that mission scenario, with multiple thrusters required. |
These are NASA’s stated targets and mission-planning estimates, not results from the 120-kW test. A nuclear power source and multiple thrusters would be needed for the Mars scenario NASA describes; the announcement does not establish a mission selection or operational schedule. (NASA, April 28, 2026)
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What are the main engineering hurdles?
Surviving heat for long operating periods
NASA reported five ignitions during the test and a tungsten central-electrode temperature above 5,000°F (2,800°C). Those conditions show a prototype firing, not endurance over a Mars mission’s operating lifetime. NASA identifies proving that components can withstand the heat over many hours as a key challenge—especially in light of the more-than-23,000-hour operating estimate for the human-mission scenario. (NASA, April 28, 2026)
Scaling power and integrating a nuclear source
The team’s stated next power target is 500 kW to 1 MW per thruster, compared with the 120-kW peak in the test. Reaching a higher power level is only part of the challenge: the proposed Mars system also depends on developing and integrating a suitable nuclear power source. The reported thruster test does not demonstrate that complete system. (NASA, April 28, 2026)
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Who is developing the prototype?
JPL leads the work with Princeton University and NASA’s Glenn Research Center. NASA’s Space Nuclear Propulsion project funds it; that project is based at Marshall Space Flight Center within NASA’s Space Technology Mission Directorate. JPL research scientist James Polk described the test as both a demonstration that the thruster works and a useful testbed for tackling the challenges of scaling it up. (NASA, April 28, 2026; JPL, April 28, 2026)
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