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Energy Reporters

NASA Unveils Nuclear Fuel Stronger Than Plutonium and Scientists Say “We’re Entering a New Age of Space Dominance”

NASA's latest breakthrough in nuclear fuel technology, featuring the promising americium-241, could revolutionize deep space exploration by providing longer-lasting and more reliable power for spacecraft operating far from the Sun.
Rosemary PotterRosemary Potter07/27/202541
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Illustration of NASA's innovative americium-241 nuclear fuel technology for deep space exploration, generated by artificial intelligence.
Illustration of NASA's innovative americium-241 nuclear fuel technology for deep space exploration, generated by artificial intelligence.
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IN A NUTSHELL
  • 🚀 NASA is testing a new nuclear fuel, americium-241, that could revolutionize deep space exploration.
  • 🔋 The Stirling generator design allows for continuous operation with minimal wear, even in the event of a convertor failure.
  • 🌌 With a half-life of 432 years, americium-241 presents a viable alternative to plutonium-238, promising longer-lasting power.
  • 🌍 NASA’s collaboration with the University of Leicester builds on European advancements, enhancing global efforts in space travel technology.

NASA is once again pushing the boundaries of space exploration, this time with a groundbreaking development in nuclear fuel technology. The agency is testing a new type of nuclear fuel that promises to outperform the traditional plutonium-238, potentially revolutionizing the way we power spacecraft destined for the far reaches of our solar system. This innovative effort is part of NASA’s broader mission to enhance the reliability and longevity of space missions, ensuring that spacecraft can operate efficiently even in the most challenging environments. As space agencies worldwide race to explore the cosmos, NASA’s latest endeavor could redefine the future of space travel.

Fueling Farther, Cheaper, Longer

Earlier this year, NASA’s Glenn Research Center in Cleveland took a significant step forward by collaborating with the University of Leicester in the United Kingdom. Together, they tested a Stirling generator powered by americium-241 heat source simulators. These simulators mimic the thermal output of americium decay, allowing engineers to evaluate the generator’s performance and reliability without the risks of handling radioactive materials.

The Stirling convertor, unlike conventional heat engines, employs floating pistons without a crankshaft or rotating bearings. This design enables the generator to operate continuously for decades with minimal wear. A remarkable feature of the Stirling generator is its ability to continue producing power even if one convertor fails. This reliability is crucial for missions that cannot afford power losses in deep space.

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Salvatore Oriti, a mechanical engineer at Glenn, emphasized the swift progress made from concept to prototype, highlighting the synergy between NASA and the University of Leicester. The successful performance and efficiency tests have paved the way for developing a next-generation testbed aimed at lower mass and higher fidelity, prepared for environmental testing. If successful, americium-241 could expand NASA’s power options for missions to the outer solar system, where sunlight is scarce and reliability is paramount.

Power That Outlasts Decades

NASA’s focus on americium-241 comes at a time when the demand for long-lived, compact, and efficient power systems is greater than ever. This need is not only for robotic spacecraft but also for future crewed missions and lunar surface operations. With a half-life of 432 years, americium-241 offers a compelling alternative to plutonium-238, which is more expensive and difficult to produce at scale.

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The collaboration between NASA and the University of Leicester builds on years of development by the European Space Agency. The Glenn team is working on the next version of the testbed, aiming for a design that is lighter, more efficient, and capable of withstanding the environmental extremes of launch and space travel.

Upcoming tests will subject the system to vibration, thermal cycling, and vacuum conditions, ensuring it can endure the rigors of real-world missions. If fully realized, americium-fueled Stirling generators could power science instruments, landers, or small surface habitats in environments where sunlight is weak or unreliable, such as the permanently shadowed craters of the Moon or the icy moons of Jupiter and Saturn.

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Expanding the Horizons of Space Exploration

The potential of americium-241 as a power source for deep space missions is immense. Its ability to provide long-lasting, reliable power could enable spacecraft to venture farther into the solar system than ever before. This capability is essential for exploring regions where solar power is not feasible due to distance from the Sun or other environmental factors.

NASA’s innovative approach to testing and developing this new fuel source reflects its commitment to advancing space exploration technologies. By partnering with international research institutions, NASA is leveraging global expertise to overcome the challenges of space travel. The successful implementation of americium-241 could set a new standard for powering future space missions, enhancing the capabilities of both robotic and human explorers.

The Future of Space Power

The development of americium-241 as a nuclear fuel source represents a significant leap forward in the quest for sustainable and efficient space power solutions. The ongoing research and testing efforts by NASA and its partners are crucial for addressing the growing demand for power systems that can support long-duration missions. As space exploration endeavors become more ambitious, the need for reliable and long-lasting energy sources will only increase.

By focusing on innovations like the americium-fueled Stirling generator, NASA is paving the way for future missions that could unlock the mysteries of the outer solar system and beyond. These advancements not only promise to enhance our understanding of the universe but also inspire new generations of scientists and engineers to continue pushing the boundaries of what is possible.

As NASA continues to explore the potential of americium-241 and other advanced technologies, the future of space exploration looks brighter than ever. How will these innovations shape the next frontier of human discovery in the cosmos?

This article is based on verified sources and supported by editorial technologies.

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Rosemary Potter
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Rosemary Potter is a Berlin-based journalist for Energy Reporters, covering European energy markets, cross-border policy, industry innovation, and the challenges of energy transition. With journalism training in the U.S., she combines investigative depth with a continental outlook. Her reporting amplifies the perspectives shaping Europe’s energy future across sectors, borders, and technologies. Contact: [email protected]

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View 41 Comments
41 Comments
  1. raymond on 07/27/2025 8:00 AM

    Wow, this sounds like a game-changer for space exploration! 🚀

    Reply
  2. Cedric on 07/27/2025 8:30 AM

    How does americium-241 compare to plutonium-238 in terms of cost and availability?

    Reply
  3. Lucy_spell6 on 07/27/2025 9:00 AM

    Is it safe to use this kind of nuclear fuel in space missions?

    Reply
  4. Christina on 07/27/2025 9:31 AM

    Can’t wait to see what missions this will power in the future! 🌌

    Reply
  5. rolandwave on 07/27/2025 10:01 AM

    Are there any environmental concerns associated with using americium-241?

    Reply
  6. John-Claudecloud on 07/27/2025 10:32 AM

    Could this technology be adapted for use on Earth as well?

    Reply
  7. Adrienne on 07/27/2025 11:02 AM

    I’m skeptical. How does NASA plan to handle potential radioactive leaks?

    Reply
  8. Elodie1 on 07/27/2025 11:33 AM

    Sounds like a big step forward for NASA. Thanks for the update!

    Reply
  9. gabriel_celestial on 07/27/2025 12:04 PM

    What are the potential risks of using americium-241?

    Reply
  10. john-philiporigami on 07/27/2025 12:34 PM

    Is this fuel really stronger than plutonium? 🤔

    Reply
  11. margaretprophecy on 07/27/2025 5:25 PM

    How long until we see this technology in action on a real mission?

    Reply
  12. Blair on 07/27/2025 5:27 PM

    Finally, a breakthrough in space power! This is so exciting! 🎉

    Reply
  13. Matthew on 07/27/2025 5:29 PM

    How does the Stirling generator work exactly?

    Reply
  14. yusufdream on 07/27/2025 5:31 PM

    Is the collaboration with the University of Leicester crucial for this project?

    Reply
  15. Julianwaterfall on 07/27/2025 5:34 PM

    How does this impact the timeline for future deep space missions?

    Reply
  16. Rashidrevelation on 07/27/2025 5:35 PM

    I’m curious about the testing process for this new fuel. Can you share more details?

    Reply
  17. Amanda on 07/27/2025 5:36 PM

    How is NASA ensuring the safety of this new nuclear fuel?

    Reply
  18. Malika on 07/27/2025 5:39 PM

    Will this technology reduce the cost of space missions?

    Reply
  19. Frankleaf on 07/27/2025 5:41 PM

    Just amazing! Keep up the great work, NASA! 🌟

    Reply
  20. thomas on 07/27/2025 5:44 PM

    Is there a backup plan if americium-241 doesn’t meet expectations?

    Reply
  21. clarissaprophecy on 07/27/2025 5:45 PM

    Are there any other countries working on similar technologies?

    Reply
  22. jocelyn on 07/27/2025 5:47 PM

    This could be a real game-changer for Mars missions! 🛸

    Reply
  23. carolinesecret on 07/27/2025 5:49 PM

    Hope this doesn’t mean more space debris! 😬

    Reply
  24. kamal1 on 07/27/2025 5:52 PM

    Why choose americium over other potential nuclear fuels?

    Reply
  25. Elodie_treasure on 07/27/2025 5:53 PM

    How will this affect the future of human space exploration?

    Reply
  26. emilyparasol on 07/27/2025 5:56 PM

    Is this the same americium used in smoke detectors?

    Reply
  27. Julieemerald6 on 07/27/2025 5:57 PM

    Is there a risk of nuclear proliferation with this technology?

    Reply
  28. Marina on 07/27/2025 5:58 PM

    Love seeing international collaboration in space technology! 🌍

    Reply
  29. stephanie on 07/27/2025 6:01 PM

    How does this compare to other energy sources used in space?

    Reply
  30. Fabiancharm on 07/27/2025 6:04 PM

    Why has it taken so long to find an alternative to plutonium-238?

    Reply
  31. danielle_poison on 07/27/2025 6:04 PM

    Is space travel going to get cheaper with this breakthrough?

    Reply
    • KrishnaGold on 08/01/2025 6:09 AM

      Holy hotdog, what’s up with all these AI commenters? Stop using it when it’s so obvious!

      Reply
  32. Isabellalandscape on 07/27/2025 6:08 PM

    Will this new fuel affect the design of future spacecraft?

    Reply
  33. melanie on 07/27/2025 6:09 PM

    It’s amazing how NASA keeps innovating in space tech! 🚀

    Reply
  34. Jack on 07/27/2025 6:12 PM

    How reliable is the Stirling generator in harsh space conditions?

    Reply
  35. terry1 on 07/27/2025 6:14 PM

    Does this mean we could eventually have nuclear-powered colonies in space?

    Reply
  36. Baptistmaze on 07/27/2025 6:15 PM

    How does this affect NASA’s budget and funding? 💰

    Reply
  37. lucysecret on 07/27/2025 6:17 PM

    Are there any plans to use this technology for lunar missions?

    Reply
  38. Sylvester on 07/27/2025 6:19 PM

    I hope this doesn’t lead to a new space race for nuclear power! 🏁

    Reply
  39. John-Lewis on 07/27/2025 6:21 PM

    What role did the University of Leicester play in this development?

    Reply
  40. Nadiagarden on 07/27/2025 6:22 PM

    Is this just the beginning for americium-based technologies?

    Reply
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Illustration of orcas interacting with sailboats off the Spanish coast.
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