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Dyson Sphere is a hypothetical megastructure that surrounds a star to capture and utilize its energy output. Proposed by physicist Freeman Dyson, it envisions an advanced civilization harnessing nearly all of a star’s energy for power. Variants include Dyson Swarms (multiple satellites orbiting the star) and Dyson Shells (a solid or semi-solid shell around the star). While purely theoretical, it represents the pinnacle of energy harvesting in the Kardashev Scale for advanced civilizations.