Caelum Incognitum — The interactive encyclopedia of ufology
Dyson sphere
Astronomy, exobiology & SETI
Concept described by Freeman Dyson in 1960: an immense structure surrounding a star to harness its energy, detectable by an infrared excess. The star KIC 8462852 (“Tabby’s star”), whose brightness dipped strangely in 2015, was briefly mentioned; dust was ultimately put forward as the explanation.