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Planet-Sized City Civilizations

Planet-sized city civilizations are one of the most iconic models in alien-civilization theory: societies whose worlds have become continuous urban environments. Drawing on Constantinos A. Doxiadis’s ecumenopolis concept, Isaac Asimov’s Trantor, and modern technosignature discussions about artificial illumination and planetary engineering, the concept sits at the intersection of planetary urbanization, megastructure thought, and advanced civilization studies.