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Home - Policy - “Nuclear Breakthrough at NASA”: New Space Power System Passes First Test Using Fuel That’s Five Times Cheaper Than Before

“Nuclear Breakthrough at NASA”: New Space Power System Passes First Test Using Fuel That’s Five Times Cheaper Than Before

In a groundbreaking collaboration, NASA and the University of Leicester have successfully tested a revolutionary nuclear power system for space missions, utilizing the cost-effective americium-241 to potentially transform the future of interplanetary exploration.
Hina DinooHina Dinoo05/02/202537
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Illustration of a revolutionary americium-fueled nuclear power system for space missions (AI-generated, non-realistic illustration). Credit: Ideogram.
Illustration of a revolutionary americium-fueled nuclear power system for space missions (AI-generated, non-realistic illustration). Credit: Ideogram.
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IN A NUTSHELL
  • 🚀 NASA and the University of Leicester have developed a groundbreaking nuclear power system for space missions.
  • 💡 This system uses americium-241, which is five times cheaper per watt than plutonium-238, transforming space power generation.
  • 🌌 The successful test positions the team at the forefront of global efforts to develop americium-fueled space nuclear power solutions.
  • 🤝 International collaboration highlights the importance of cross-border partnerships in advancing space technology.

In a groundbreaking collaboration, scientists and engineers from the University of Leicester and NASA Glenn Research Center are pioneering a new era of space exploration with their innovative nuclear power system. This system employs americium-241, a cost-effective alternative to the traditionally used plutonium-238, promising to revolutionize power generation for space missions. As humanity’s aspirations extend beyond Earth, the need for reliable and efficient power sources becomes paramount. This partnership not only advances technological frontiers but also underscores the potential for international cooperation in achieving unprecedented space exploration milestones.

The Science Behind Radioisotope Power Systems

For over a decade, the University of Leicester has been at the forefront of developing radioisotope power systems (RPSs), which play a crucial role in powering spacecraft traveling to the far reaches of our solar system. RPSs convert the heat from the radioactive decay of materials into electrical power, making them indispensable for missions where solar power is ineffective. Historically, these systems have relied on plutonium-238, a material that is both expensive and in limited supply. The introduction of americium-241 as an alternative marks a significant leap forward.

Americium-241, which can be extracted from reprocessed nuclear fuel, offers a more economical solution, being five times cheaper per watt compared to plutonium-238. This cost-effectiveness, combined with recent funding from the UK Space Agency and NASA’s Radioisotope Power System Program, has enabled the University of Leicester to push the boundaries of RPS development. Their recent collaboration with NASA Glenn culminated in a successful laboratory demonstration, showcasing a prototype that uses electrically-heated americium heat sources to power Advanced Stirling Convertors.

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Pioneering Power for Long-Duration Missions

The significance of this technological breakthrough cannot be overstated. As space agencies worldwide set their sights on Mars and beyond, the demand for robust and reliable power systems becomes ever more critical. The successful demonstration of americium-fueled systems positions the team at the forefront of global efforts to develop space nuclear power solutions. Dr. Hannah Sargeant, a research fellow at the University of Leicester, highlighted the system’s resilience, noting its ability to withstand a failed Stirling convertor without losing electrical power.

This feature is particularly crucial for long-duration missions that may span several decades, as it underscores the reliability and durability of the Americium-Radioisotope Stirling Generator. The team’s hardware-forward approach, characterized by rapid iteration cycles, continually yields promising outcomes, bringing the vision of sustained human presence in space closer to reality. As the world’s space powers intensify their exploration efforts, such innovations are vital in enabling humanity to expand its footprint across the solar system.

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International Collaboration and Technological Advancements

The partnership between the University of Leicester and NASA Glenn exemplifies the power of international collaboration in advancing space technology. Through the International Space Act Agreement, both entities have leveraged their expertise to develop a system that could redefine the future of space missions. The integration of americium heat sources with NASA’s power converter technologies showcases a seamless fusion of innovation and expertise from both sides of the Atlantic.

This collaboration also highlights the importance of cross-border partnerships in tackling complex scientific challenges. As space exploration becomes increasingly ambitious, pooling resources and knowledge from diverse teams worldwide will be essential in overcoming the hurdles that lie ahead. The success of this project serves as a testament to the potential of such partnerships in driving technological progress and achieving shared goals for the benefit of humanity.

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The Future of Space Nuclear Power Systems

With the successful test of the americium-fueled power system, the prospects for future space missions are brighter than ever. This innovative approach not only reduces costs but also enhances the reliability and sustainability of power systems, paving the way for more ambitious exploration endeavors. As the world gears up for missions to Mars and beyond, the development of such advanced technologies will be crucial in ensuring mission success and crew safety.

Furthermore, the use of americium-241 represents a step towards more sustainable practices in space exploration. By utilizing materials that are more readily available and affordable, space agencies can allocate resources more efficiently, ultimately accelerating the pace of exploration and discovery. As we look to the future, one question remains: How will these advancements shape the next era of space exploration, and what new frontiers will they open for humanity?

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Hina Dinoo
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Hina Dinoo is a Toronto-based journalist at Sustainability Times, covering the intersection of science, economics, and environmental change. With a background in journalism acquired in Toronto, she translates complexity into clarity. Her work focuses on how systems — ecological, financial, and social — shape our sustainable future. Contact: [email protected]

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View 37 Comments
37 Comments
  1. Mohammed on 05/02/2025 6:56 AM

    This is amazing! 🚀 Can’t wait to see what NASA achieves next with this tech!

    Reply
  2. Amelia on 05/02/2025 7:26 AM

    How long before this new power system is used on actual missions?

    Reply
  3. nicholas on 05/02/2025 7:57 AM

    Cheaper fuel? Sounds too good to be true. Is there a catch? 🤔

    Reply
  4. Fatima on 05/02/2025 8:07 AM

    I’m skeptical about the long-term effects of using americium-241. Anyone else?

    Reply
  5. Josie on 05/02/2025 8:10 AM

    Great news! But how reliable is this system over extended periods?

    Reply
  6. bernard on 05/02/2025 8:12 AM

    Why hasn’t this been done before if it’s so much cheaper?

    Reply
    • Dušan on 05/03/2025 9:11 AM

      Five times cheaper makes no sense as one time cheaper is already price zero. One fifth of the price is correct.

      Reply
  7. Arthur on 05/02/2025 8:16 AM

    Can this technology be applied to energy generation on Earth?

    Reply
  8. Edwardmeteor5 on 05/02/2025 8:18 AM

    Loving the innovation, but what’s the potential risk factor here? 🔍

    Reply
  9. roman2 on 05/02/2025 8:20 AM

    Incredible progress! Thank you to the brilliant minds making this happen. 🙏

    Reply
  10. Xavierfreedom9 on 05/02/2025 8:24 AM

    Is this going to increase the number of space missions in the near future?

    Reply
  11. Fabian9 on 05/02/2025 8:26 AM

    Hope this doesn’t lead to an arms race in space tech. 🤞

    Reply
  12. amandaillusion on 05/02/2025 8:27 AM

    Thank you for the great work, NASA and University of Leicester! This is the future of space exploration!

    Reply
    • Justan on 05/04/2025 2:08 AM

      If it could we would have been using it before. But since everyone is afraid of nuclear power and weapons. It’s not likely to make a difference on earth. Nuclear power was good. But not enough money was put in to it in the first place. Instead we put money in to making bombs. And now we all have a fear of it. I think if we try to use what we have and improve it. Yes we can use other nuclear waste for energy production. But we need to be safe with it. Careful with it. We have lots of waste. That could be made into many different fuels that can be used for many things. But no body in the USA will process the waste for fuels. Because they are afraid of bombs being made instead.

      Reply
  13. aurelia1 on 05/02/2025 8:29 AM

    How does this affect the current plans for Mars exploration?

    Reply
  14. mary_destiny on 05/02/2025 8:33 AM

    Why isn’t this being covered more in the news?

    Reply
  15. Damianspark on 05/02/2025 8:35 AM

    This is potentially a game-changer for long-duration missions! 🌌

    Reply
  16. coraliehunter on 05/02/2025 8:38 AM

    I have questions about the safety of using nuclear power in space…

    Reply
  17. Remyfairytale on 05/02/2025 8:40 AM

    Exciting! But how will they dispose of the waste from americium-241?

    Reply
  18. nadiadew on 05/02/2025 8:43 AM

    What an incredible achievement for international science partnerships! 👏

    Reply
  19. yusuf on 05/02/2025 8:45 AM

    How much does this reduce the cost of a typical space mission?

    Reply
  20. ali on 05/02/2025 8:48 AM

    More power to the space explorers! Literally! 😂

    Reply
  21. terry_night on 05/02/2025 8:51 AM

    When do they plan to launch a mission using this new system?

    Reply
  22. Nadia on 05/02/2025 8:53 AM

    This sounds promising, but what about the political implications? 🤨

    Reply
  23. David on 05/02/2025 8:56 AM

    Are there any environmental concerns with using americium-241 in space?

    Reply
  24. richard on 05/02/2025 8:57 AM

    What other space agencies are looking into similar technologies?

    Reply
  25. aurora on 05/02/2025 8:59 AM

    Can we expect more collaborations like this in the future? Hopefully! 🤞

    Reply
  26. yusuffantasy on 05/02/2025 9:02 AM

    Sounds like science fiction becoming reality. What a time to be alive! 🚀

    Reply
  27. margotsymphony on 05/02/2025 9:06 AM

    Is there a risk of nuclear contamination in space?

    Reply
  28. carlasoaring on 05/02/2025 9:28 AM

    Wow, international collaboration at its best! 🌍💫

    Reply
  29. blairmysticism on 05/02/2025 9:57 AM

    Finally, a cost-effective solution for space missions! What took so long? 😅

    Reply
  30. john-claudeprophecy5 on 05/02/2025 10:26 AM

    I hope this means more missions to Mars soon!

    Reply
  31. Maxfortune on 05/02/2025 10:56 AM

    How does americium-241 compare to plutonium-238 in terms of energy output?

    Reply
    • Dale-who-knows on 05/02/2025 8:46 PM

      1/5th the cost. .9873 the power density.

      Reply
  32. Edward on 05/02/2025 11:26 AM

    Does this mean we might see humans living on Mars within our lifetime?

    Reply
  33. Joe Davies on 05/02/2025 11:37 AM

    If NASA has a hand in it, we better switch back to deisel fuel in the boosters.

    Reply
  34. Reedman on 05/03/2025 10:18 PM

    1. NASA already developed the Stirling generator using Highly Enriched Uranium. It’s called the KRUSTY Kilopower generator
    2. Americium 241 is used in smoke detectors. It has a much shorter half life than Uranium, and therefore puts out more power per pound

    Reply
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