>>12064581>what was it /sci/ ?It has all the hallmarks of an alien technosignature. It was emitted with high intensity, on a very narrow band and close to the hydrogen line.
>why hasn't it been detected again?Because, if it was indeed an alien technosignature, it was emitted at least 120 years ago, before any evidence of industrial Human activity became detectable from outer space.
So whatever it was, it wasn't aimed at us.
