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" ... Technosignatures, also known as a “technomarker,” are signs of technology developed by intelligent life. We have not idea what form they would take, and whether we would be able to detect them. Perhaps they can only ever be recognizable to us 21st-century humans if they already exist on our own planet. For example, the mysterious dimming of Tabby's Star/Boyajian’s Star (actually called KIC 8462852) in the constellation of Cygnus, detected by Tabetha S. Boyajian in 2015, could be explained by the existence of an alien megastructure around the star periodically blocking light. To find those, telescopes need to look for optical pulses. Another avenue is to look for much faster optical pulses, which could be evidence of optical communications. That’s what Breakthrough Listen is now looking for. ... "