The Coldest “Stars” in the Galaxy Might Actually Be Alien Megastructures

Astronomers may be able to identify possible Dyson swarms by looking for unusually cold, clean infrared signals around long-lived stars. Since physicist Freeman Dyson introduced the idea in 1960, the “Dyson sphere” has become one of the most sought-after possible technosignatures in the search for advanced alien civilizations. The basic idea is that a civilization [...]