nuclear reactor

NASA plans to build a nuclear reactor on the Moon—a space lawyer explains why

nuclear reactor, Policy, Space, space law, syndication, the Moon / Mike M. / August 10, 2025

These sought-after regions are scientifically vital and geopolitically sensitive, as multiple countries want to build bases or conduct research there. Building infrastructure in these areas would cement a country’s ability to access the resources there and potentially exclude others from doing the same.

Critics may worry about radiation risks. Even if designed for peaceful use and contained properly, reactors introduce new environmental and operational hazards, particularly in a dangerous setting such as space. But the UN guidelines do outline rigorous safety protocols, and following them could potentially mitigate these concerns.

Why nuclear? Because solar has limits

The Moon has little atmosphere and experiences 14-day stretches of darkness. In some shadowed craters, where ice is likely to be found, sunlight never reaches the surface at all. These issues make solar energy unreliable, if not impossible, in some of the most critical regions.

A small lunar reactor could operate continuously for a decade or more, powering habitats, rovers, 3D printers, and life-support systems. Nuclear power could be the linchpin for long-term human activity. And it’s not just about the Moon – developing this capability is essential for missions to Mars, where solar power is even more constrained.

The UN Committee on the Peaceful Uses of Outer Space sets guidelines to govern how countries act in outer space. United States Mission to International Organizations in Vienna. Credit: CC BY-NC-ND

A call for governance, not alarm

The United States has an opportunity to lead not just in technology but in governance. If it commits to sharing its plans publicly, following Article IX of the Outer Space Treaty and reaffirming a commitment to peaceful use and international participation, it will encourage other countries to do the same.

The future of the Moon won’t be determined by who plants the most flags. It will be determined by who builds what, and how. Nuclear power may be essential for that future. Building transparently and in line with international guidelines would allow countries to more safely realize that future.

A reactor on the Moon isn’t a territorial claim or a declaration of war. But it is infrastructure. And infrastructure will be how countries display power—of all kinds—in the next era of space exploration.

Michelle L.D. Hanlon, Professor of Air and Space Law, University of Mississippi. This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Google and Kairos sign nuclear reactor deal with aim to power AI

Google isn’t alone in eyeballing nuclear power as an energy source for massive datacenters. In September, Ars reported on a plan from Microsoft that would re-open the Three Mile Island nuclear power plant in Pennsylvania to fulfill some of its power needs. And the US administration is getting into the nuclear act as well, signing a bipartisan ADVANCE act in July with the aim of jump-starting new nuclear power technology.

AI is driving demand for nuclear

In some ways, it would be an interesting twist if demand for training and running power-hungry AI models, which are often criticized as wasteful, ends up kick-starting a nuclear power renaissance that helps wean the US off fossil fuels and eventually reduces the impact of global climate change. These days, almost every Big Tech corporate position could be seen as an optics play designed to increase shareholder value, but this may be one of the rare times when the needs of giant corporations accidentally align with the needs of the planet.

Even from a cynical angle, the partnership between Google and Kairos Power represents a step toward the development of next-generation nuclear power as an ostensibly clean energy source (especially when compared to coal-fired power plants). As the world sees increasing energy demands, collaborations like this one, along with adopting solutions like solar and wind power, may play a key role in reducing greenhouse gas emissions.

Despite that potential upside, some experts are deeply skeptical of the Google-Kairos deal, suggesting that this recent rush to nuclear may result in Big Tech ownership of clean power generation. Dr. Sasha Luccioni, Climate and AI Lead at Hugging Face, wrote on X, “One step closer to a world of private nuclear power plants controlled by Big Tech to power the generative AI boom. Instead of rethinking the way we build and deploy these systems in the first place.”