NASA’s new nuclear battery could run for 433 years living five human lifetimes

Synopsis

Nuclear Space Batteries: NASA is developing a new nuclear battery using americium-241 that could last up to 433 years, far longer than current plutonium-238 systems. The technology promises reliable power for long-duration missions far from the Sun, potentially transforming deep space exploration.

Spacecraft operating far from the Sun cannot rely on solar panels. For decades, NASA has used radioisotope power systems (RPS) powered by plutonium-238, which has a half-life of about 88 years. Now, researchers are testing americium-241 — an isotope with a half-life of nearly 433 years — as a potential fuel for the next generation of nuclear batteries.

How this 433-year operational nuclear battery works

Radioisotope power systems generate electricity from the natural heat produced by the radioactive decay of isotopes. The heat is converted into electricity using free-piston Stirling converters. These converters have been tested to run continuously for over a decade with minimal wear, making them ideal for microgravity environments.

Americium-241, currently under evaluation by NASA in collaboration with the University of Leicester and US national laboratories (including Oak Ridge, Idaho, and Los Alamos), offers significantly slower decay. This means the battery can provide usable power for centuries rather than decades.

Americium-241’s advantages over current Plutonium-238 batteries

• Longer operational life: Americium-241’s 433-year half-life is almost five times longer than plutonium-238’s 88 years.
• Reliable power in deep space: The system works independently of sunlight and requires no recharging or maintenance.
• Steady energy output: It delivers constant power for instruments, communication systems, and onboard electronics even on missions lasting hundreds of years.

While americium-241 does not produce higher initial power than plutonium-238, its longevity makes it highly suitable for ultra-long-duration missions to the outer Solar System and beyond.

Potential impact on future space missions

This nuclear battery could enable spacecraft to explore distant regions of space for generations without power constraints. Missions that once faced declining energy after a few decades could now operate reliably for centuries, opening new possibilities for interstellar probes and long-term planetary exploration.

The technology is still in the testing and development phase and has not yet replaced plutonium-238 in operational spacecraft, but early results are promising.

(With TOI inputs)