Inverse Dyson Spheres Around Black Holes: Speculative Energy Harvesting and Its Technosignature Implications

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Researchers led by Tiger Yu-Yang Hsiao propose building an energy-harvesting megastructure around a black hole that could collect far more power than a star, making the black hole a potential technosignature of intelligent life, though the idea remains speculative and unsupported by evidence.

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Intelligent Extraterrestrial Civilizations May be Harvesting Energy from Black Holes Using Dyson Spheres
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Intelligent Extraterrestrial Civilizations May be Harvesting Energy from Black Holes Using Dyson Spheres

Researchers from the National Tsing Hua University in Taiwan, led by Tiger Yu-Yang Hsiao, searched for evidence of Dyson spheres, which is a megastructure that completely encompasses a star and captures a large percentage of its power output. However, this time, they were seeking an inverse Dyson sphere (IDS), which could technically harvest energy from a black hole in a similar fashion. Not only would the energy output of a black hole exceed that of a star, the waste heat produced from an IDS can actually be detected by our current telescopes. Plus, there are no known metals that could