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Ecumenopolis Alien Societies

Ecumenopolis alien societies are one of the most sophisticated city-planet models in alien-civilization theory: civilizations whose worlds have become integrated global urban systems rather than merely large planets with many cities. Drawing on Constantinos A. Doxiadis’s world-city concept, later urban-systems thinking, and technosignature ideas such as exoplanet city lights and planetary waste heat, the concept explores what happens when an entire inhabited world becomes one continuous civilizational machine.