Using Nuclear Power to Explore the Moon's Dark Craters

NASA and other space groups are planning a big return to the Moon. The goal is not just a quick visit. They want to build a long home for humans there. To make this safe and affordable, scientists are using a plan called In-Situ Resource Utilization. This means using materials found on the Moon itself. They will use local rocks and ice to build homes and make things astronauts need. Because of this plan, a special place called the South Pole-Aitken Basin is a top target. This area has many deep craters that never see sunlight. These dark spots are called Permanently Shadowed Regions, or PSRs. Scientists think these frozen craters hold ice and other useful resources. They are perfect spots for future Moon bases and long missions.

The water ice inside these craters is also a huge scientific treasure. It acts like a frozen record of the Solar System. It might hold clues that are billions of years old. However, exploring these dark craters is very hard. They are among the most dangerous places in the inner Solar System. Since sunlight never touches them, the temperature drops to -240 degrees Celsius. This extreme cold means solar panels cannot work. There is no way for them to get power from the sun. A new study suggests that the only good way to explore these dark zones is with nuclear-powered robots.

A new study titled "Radioisotope mission concepts for in-situ exploration of permanently shadowed regions on the Moon" looks at this idea. The paper was written by A.C. Charania and Charlie Crouse. They work for private space companies called Zeno Power and Advanced Space. They shared their ideas at the 2026 Lunar and Planetary Science Conference. They explain that studying ice in these craters will help us learn how the Moon formed. This knowledge will help find resources for future human missions. These missions include NASA's Artemis program and the International Lunar Research Station. The research could also help companies mine water or minerals on the Moon.

The authors wrote that measuring conditions on the ground helps prove what orbiting satellites see. It also makes landing in these dangerous areas safer for people. Old ideas suggested rovers driving from a sunny area into a dark crater. The new plan proposes landing spacecraft directly inside the dark crater. This is a huge challenge. The cold, darkness, and bad communication signals make it very difficult. To solve the power problem, the authors suggest using Radioisotope Power Systems. These systems make heat and electricity from the slow decay of radioactive materials. NASA has used this technology for decades on missions to Mars. For the Moon, however, the scientists recommend a specific fuel called Americium-241.

Americium-241 is made by humans. It has some advantages over the usual Plutonium-238 used in most power systems. One big advantage is that it is easier to get. The United States has had a shortage of Plutonium-238 since 1988. The government started making more in 2015, but there is not enough. Importing it from Russia is also not allowed now. Using Americium-241 could solve this supply problem. It provides the same reliable power needed for deep space travel.

The study describes two mission ideas powered by this new fuel. The first is a smaller mission using Radioisotope Heater Units. These units only make heat, not electricity. They keep the lander's instruments warm in the freezing cold. This small lander would drop directly into a chosen crater at the Moon's south pole.

Oak Ridge National Lab developed an automated metrology system for production of Pu-238 pellets. Credit: ORNL/Department of Energy

The second idea is more advanced. It uses an Americium-fueled Radioisotope Stirling Generator. This system turns heat into electricity. It powers more complex scientific tools. This lander would carry many instruments for detailed analysis. Landing directly inside the dark zone is a key difference. Older plans relied on rovers traveling from a sunny site. They had to cross a crater rim and enter the shadow. This required surviving huge temperature changes between hot and cold. By landing directly in the shadow, these new missions avoid that stress entirely.

The authors say these ideas show that nuclear spacecraft can change lunar science. Such missions would allow work in the coldest places on the Moon for a long time. The data gathered would help scientists understand our Solar System better. It also fits the goal of programs like Artemis. They want to create a permanent home on the Moon.

By using nuclear power, we can finally reach the darkest corners of the Moon. These places hold secrets hidden for billions of years. With the right technology, robots can enter these zones without freezing. This ability opens the door to new discoveries. It could change how we see our place in the universe. It also paves the way for astronauts to live on the Moon. The journey to a lunar future is becoming clearer. The use of Americium-241 is a strategic shift. It addresses the fuel shortage while ensuring rovers survive where no sun has shone. As technology advances, these nuclear robots will lead the way. They will prepare the ground for the first permanent residents. When humans eventually walk into these dark craters, they will be ready.