NASA is making a powerful new ion engine to send astronauts to Mars – and it just passed its 1st test – Image for illustrative purposes only (Image credits: Unsplash)
Southern California — Engineers at NASA’s Jet Propulsion Laboratory fired up a prototype thruster on February 24, 2026, achieving power levels of 120 kilowatts for the first time in years at such scale in the United States.[1][2] This lithium-fed device, designed for eventual crewed Mars missions, marked a significant step forward by surpassing the capabilities of current spacecraft propulsion systems. The test highlighted the potential of advanced electric propulsion to transform deep-space travel.
A Fiery First: The Record-Breaking Test
During five separate ignitions inside a specialized 26-foot-long vacuum chamber, the thruster’s tungsten electrode glowed white-hot, exceeding 5,000 degrees Fahrenheit.[1] Researchers observed a vibrant red plume from the nozzle-shaped outer electrode, confirming stable operation at unprecedented power.[2] Conducted at JPL’s Electric Propulsion Lab, the experiment utilized the unique condensable metal propellant facility, built to handle metal vapor tests up to megawatt levels.
The milestone came after 2.5 years of development, led by JPL in partnership with Princeton University and NASA’s Glenn Research Center.[1] Data from this initial run will guide future trials, focusing on endurance and scaling. NASA Administrator Jared Isaacman emphasized the achievement’s importance, stating it represented “real progress toward sending an American astronaut to set foot on the Red Planet.”[2]
Inside the Lithium MPD Thruster
Magnetoplasmadynamic thrusters like this one accelerate lithium plasma through high currents and magnetic fields, differing from traditional designs.[1] While ion engines ionize and electrically accelerate gas, MPD systems electromagnetically propel the plasma for higher thrust potential. Lithium metal vapor serves as the propellant, offering efficiency advantages over gases like xenon used in solar-powered systems.
Electric propulsion overall consumes up to 90% less propellant than chemical rockets, building speed gradually over long durations.[2] Though researched since the 1960s, lithium MPD technology has yet to fly on a mission. Senior research scientist James Polk, who observed the test firsthand, called it a “huge moment” after years of preparation, noting the team met targeted power levels precisely.[1]
Power Comparison: Leaving Psyche in the Dust
The Psyche spacecraft, en route to a metal-rich asteroid, relies on Hall-effect thrusters that represent NASA’s current electric propulsion pinnacle.[2] Those systems operate around 4.5 kilowatts each, steadily pushing the probe toward 124,000 mph. The new prototype’s 120 kilowatts dwarfed them, delivering more than 25 times the power in a single unit.
| Feature | Lithium MPD Prototype | Psyche Thrusters |
|---|---|---|
| Power Level | Up to 120 kW | ~4.5 kW per thruster |
| Propellant | Lithium metal vapor | Xenon gas |
| Power Source | Nuclear (future) | Solar |
| Thrust Type | Electromagnetic plasma | Electrostatic ions |
This table underscores the leap: greater power density could enable heavier payloads and faster transits.[1]
Toward Mars: Nuclear Pairing and Next Horizons
Funded under NASA’s Space Nuclear Propulsion project since 2020, the effort targets megawatt-class systems for human exploration.[2] A Mars crewed mission may demand 2 to 4 megawatts total, supplied by clusters of MPD thrusters running over 23,000 hours. Pairing with nuclear reactors would overcome solar power’s limits far from the Sun, slashing launch mass while boosting capacity for habitats and supplies.
Challenges remain, particularly heat management at extreme temperatures over extended operations. The team plans to push individual thrusters to 500 kilowatts to 1 megawatt soon. Polk highlighted the robust testbed’s role in tackling these hurdles systematically.[1]
What This Means for Space Exploration
Isaacman affirmed NASA’s commitment: “We will continue to make strategic investments that will propel that next giant leap.”[2] This test not only validated a long-dormant concept but also positioned lithium MPD thrusters as a cornerstone for solar system ambitions. As development accelerates, the path from prototype to Mars orbit grows clearer, promising missions that carry humans farther and faster than ever before.