Seven Dyson Sphere Candidates: Infrared Signatures and the Feasibility of Alien Megastructures

To the point

Freeman Dyson’s idea of a Dyson sphere has driven scientists to search for alien civilizations in three ways and they have identified seven candidate megastructures around M-dwarf stars within about 1,000 light-years, which would emit infrared radiation and could dim the star when they pass in front, but their existence remains uncertain because building such structures would require astronomical amounts of material and faces feasibility questions under Nikolai Kardashev’s framework, even as Simon Goodwin says future infrared signatures or transit signals could still hint at extraordinary engineering.