The article examines Elon Musk's proposal to build AI datacenters in space. While cooling via heat radiation is feasible—requiring roughly 250,000 square meters of radiators for a 100MW facility—it remains wildly impractical overall due to the massive launch mass needed, repair difficulties, and other logistical challenges. Cooling itself is not the fundamental obstacle.
The article argues that contrary to popular belief, cooling is not a major problem for AI datacenters in space. In the vacuum of space, heat dissipation can be effectively managed through radiation, making space-based datacenters potentially viable for overcoming terrestrial cooling constraints for AI workloads.
The article argues that the main argument for placing AI datacenters in space — that cooling is easier in the cold vacuum — is misleading. In reality, heat dissipation in space is far more difficult because conductive and convective cooling are absent, leaving only slow radiative cooling. The author concludes that space datacenters would face severe cooling challenges, not solve them.