WISE data yield upper limits showing that no more than about 0.016% of nearby galaxies can host KIII-scale systems reprocessing at least 21% of a Milky Way-like stellar luminosity into 300 K waste heat.
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WISE/CatWISE Constraints on Dysonian Waste-Heat Technosignatures in Nearby Galaxies
WISE data yield upper limits showing that no more than about 0.016% of nearby galaxies can host KIII-scale systems reprocessing at least 21% of a Milky Way-like stellar luminosity into 300 K waste heat.