Alien supercomputers will reveal themselves: physicists calculate unique thermal signature of advanced civilizations

In 1960, physicist Freeman Dyson formulated a fundamental principle for the search for advanced extraterrestrial civilizations. His logic was based on a basic law of physics: any use of energy inevitably produces heat. If a hypothetical community intercepts a significant portion of its star's power, it cannot accumulate this energy indefinitely. Materials degrade at relatively low temperatures, and the capacity of any internal storage is finite. Ultimately, all intercepted energy must be dissipated into open space as electromagnetic thermal waste. Based on this idea, astronomers have spent more than half a century searching for Dyson spheres—large-scale engineering structures around stars. However, almost all research programs carried an implicit assumption: they calculated to find…