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The Type II Stellar Civilization

The Type II stellar civilization is the second major tier in the Kardashev scale of technological civilizations. Usually defined as a civilization able to capture and use the full energy output of its host star, Type II has become one of the most important frameworks in SETI, technosignature studies, and advanced alien-civilization theory, especially through later ideas such as Dyson spheres, Dyson swarms, and stellar-scale engineering.