Hunting Alien Waste Heat: Dyson Spheres and the Infrared Sky
Grounded in the laws of thermodynamics, searches for Dyson spheres and Kardashev Type III civilizations look for mid-infrared waste heat. Analyzing data from space observatories like WISE and Spitzer, the Ĝ search established quantitative upper bounds, demonstrating that galaxy-spanning civilizations are exceptionally rare in the local cosmos.