The engine that proved we could sail the stars on electricity

Space · Published 17 October 2026 Swipe more like this →

In short: In 1998, NASA launched a spacecraft to test a radical idea: using xenon gas and electricity instead of chemical explosions to travel through deep space. It was a high-risk gamble on ion propulsion that ultimately paved the way for modern interplanetary exploration.

Deep Space 1 (DS1) served as an engineering test flight for twelve high-risk technologies, most notably the NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) thruster. Developed by researchers at Lewis Research Center and the Jet Propulsion Laboratory, this ion engine used electrical charges to repel exhaust fluid. While conventional chemical propellants were the standard, DS1 demonstrated a specific impulse of 3,100 seconds—roughly ten times higher than what was possible with traditional rockets.

The mission faced immediate hurdles. During its first test on November 10, 1998, the engine failed after just 4.5 minutes due to self-contamination. However, engineers successfully resumed long-duration burns on November 24. By August 17, 2000, the engine had operated continuously for 162 days. Surpassing all previous records, the craft functioned for 16,265 hours, yielding a delta-v of roughly 3 miles per second—a peak velocity shift for any self-propelled vessel.

Beyond propulsion, DS1 pioneered autonomous navigation. The AutoNav system allowed the craft to triangulate its position by tracking moving asteroids against a fixed star background, reducing the need for constant human intervention via the Deep Space Network. This technology was later utilized on missions like Deep Impact. Despite a critical star tracker failure in 1999 that nearly doomed the mission, engineers devised an innovative new attitude control system to keep DS1 operational, eventually allowing it to capture some of the best images of Comet Borrelly's dark, organic-rich surface.

The success of DS1 validated ion engines for long-duration flight. This lineage continued with the 2007 Dawn mission and current developments like the NEXT-C system, proving that electric propulsion is a cornerstone of future deep space exploration.

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