Elon Musk argued late on Monday that cooling artificial intelligence data centers in space could prove easier than on Earth, explaining how aluminum radiators could help future satellites run powerful computers without conventional cooling infrastructure.
Musk Explains How Space Radiators Work
"Yeah, much easier to cool in space," Musk wrote on X, responding to Sequoia Capital partner Shaun Maguire. He estimated that an aluminum radiator facing away from the Sun could release approximately 1,300 watts of heat per square meter because it faces cosmic background radiation at "~3 degrees above absolute zero!"
Unlike Earth’s cooling systems, which often use air or water to carry away heat, spacecraft must release excess heat as invisible infrared radiation. NASA confirms that radiators already perform this function aboard satellites and the International Space Station.
Musk explained that solar panels generate approximately 250 watts of electricity per square meter, meaning satellites would need roughly five times more solar-panel area than radiator area under his assumptions.
"Most of the mass of the satellite is solar panels," he added, reinforcing his earlier argument that orbital AI satellites require relatively simple hardware.
Starship Could Make Orbital Cooling Practical
Maguire argued that Space Exploration Technologies Corp.’s (NASDAQ:SPCX) Starship rocket represents the biggest obstacle because launching heavy equipment remains expensive. Once launch costs fall, aluminum structures could transfer heat from computing chips into circulating fluids such as ammonia, allowing radiators to release it into space.
NASA already uses ammonia-based cooling systems aboard the International Space Station, although its main external cooling loops require pumps. SpaceX executives have similarly identified Starship as essential to scaling orbital AI infrastructure.
SpaceX Faces Challenges Scaling Orbital Computing
Reuters reported in June that SpaceX’s proposed first-generation AI satellite could deliver 120 kilowatts of sustained computing power, roughly equivalent to an Nvidia Corp. (NASDAQ:NVDA) GB300 server rack. The company plans to adapt existing Starlink technology rather than develop entirely new systems.
However, cooling performance depends on radiator temperature, orientation and exposure to sunlight. Analysts have also questioned whether orbital data centers can overcome launch costs and maintenance challenges.
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