The hallmarks of a Dyson sphere can be summed up easily: variability in a star’s brightness and an excess of IR radiation of a particular pattern due to waste heat. With Tabby’s star ...

A star named KIC 8462852, aka Tabby's Star, kept dimming ... If aliens built a megastructure called a Dyson Sphere to siphon off the star's energy that could explain how the star is a whopping ...