Fast Radio Bursts (FRBs)

"Astronomers have been working to better understand the galactic environments of fast radio bursts (FRBs) – intense, momentary bursts of energy occurring in mere milliseconds and with unknown cosmic origins."

https://www.astronomy.com/science/astronomers-detected-two-major-targets-with-a-single-telescope-a-mysterious-signal-and-its-source-galaxy/