NASA Glenn Takes Lead on First U.S. Space Nuclear Reactor in Over 60 Years
NASA's Glenn Research Center has initiated work on designing the first U.S. nuclear reactor for space in over 60 years, representing a significant shift in the agency's approach to power generation for future deep space missions.
The last U.S. nuclear reactor launched into space was part of the Systems Nuclear Auxiliary Power (SNAP) program in the 1960s. Since then, NASA has relied primarily on solar power and radioisotope thermoelectric generators (RTGs) for spacecraft operating beyond Earth orbit. The new effort signals recognition that nuclear fission technology could provide the consistent, high-capacity power output needed for long-duration crewed missions to Mars and beyond.
Space-based nuclear reactors offer several advantages over solar panels in deep space, where sunlight intensity diminishes rapidly with distance from the Sun. A fission reactor can provide reliable power regardless of proximity to the Sun, operate through long shadow periods, and support higher-power systems including advanced propulsion technologies and life support equipment for crewed missions.
The project reflects growing interest within NASA and the broader U.S. government in establishing nuclear power capabilities for space exploration. Officials have noted that sustained power generation from nuclear sources could enable more ambitious missions that solar technology alone cannot support.
Details about the reactor's specific design specifications, power output targets, or expected launch timeline have not yet been publicly disclosed, according to available reporting.