Three nuclear powers are converging on the same narrow strip of lunar real estate — the permanently shadowed craters near the moon's south pole, where frozen water has sat undisturbed for millions of years. The US wants its 20-kilowatt Lunar Reactor 1 operational by 2030. Russia and China aim to land the lighter Selena reactor by 2036 to power a joint base. The physics is straightforward; the geopolitics is not. The reactors themselves are modest machines. NASA's design weighs under 6,000kg and fits inside a standard rocket compartment. Russia's Selena is lighter still at roughly 1,200kg, producing 10 kilowatts — enough to run for a decade without maintenance. Neither represents a breakthrough in nuclear engineering. What they represent is a delivery mechanism for something far more valuable: permanent presence at the ice. The 1967 Outer Space Treaty forbids territorial claims on the moon, but it does not ban nuclear power in space. This creates a loophole large enough to land a reactor through. Once a reactor is running, the operating country can declare a "safety zone" around it — not a territorial claim, legally, but functionally indistinguishable from one. Nobody enters a radioactive perimeter voluntarily. Whoever plants a reactor at the best water-ice deposits first locks others out without claiming a single square metre of sovereignty. Simon Middleburgh of Bangor University's Nuclear Futures Institute frames the engineering challenge correctly: the hard part is not the nuclear technology but the regulation for launch, the availability of a launch platform, and the landing itself. Solar power fails here because the sun shines on any given lunar spot only half the time, leaving panels dark for two weeks every month. Nuclear is the obvious energy source for continuous mining operations. Three or four reactors working together would be needed to sustain both ice mining and base operations. The precedent for things going wrong already exists. In 1978, the Soviet satellite Kosmos 954 scattered radioactive debris across 124,300 square kilometres of northern Canada. On the moon, contamination would be "extremely localised," according to Middleburgh. But the Lunar Policy Platform's recent report identifies the real gap: existing liability rules were never designed for long-term hazardous equipment on another celestial body. If a reactor malfunctions on the lunar surface, there is no legal framework for cleanup, compensation, or responsibility. Trump's December 2025 executive order accelerated NASA's timeline. China and Russia have matched the urgency. US Transportation Secretary Sean Duffy said plainly in August that the US is "in a race to the moon, in a race with China." The military dimension is not hypothetical — the US announced in September that it had deployed weapons into orbit, reportedly communications jammers. The moon race sits inside a broader contest for space dominance where civilian and military infrastructure increasingly overlap. The $20 billion the US has spent on advanced space nuclear programmes over 70 years has produced exactly one reactor launch, in 1965 — which shut down after 43 days due to a non-nuclear electrical failure and is still floating in space. The Soviets launched more than 30 fission reactors into orbit during the Cold War. The gap between ambition and execution is the story's real variable. Whoever solves the landing and setup problem first does not just get electricity — they get position.
