Scientists have detected the second repeating fast radio burst (FRB) ever recorded, a discovery that may help determine the origin of these mysterious signals which have been linked with advanced alien technology in the past. Some scientists also believe that FRBs emanate from powerful astrophysical phenomena billions of light years away. However, the source of these signals, originating from far outside our Milky Way galaxy, are not well understood. In 2017, Harvard scientists have speculated that these FRBs might be leakage from planet-sized transmitters powering interstellar probes in distant galaxies. They said that since a natural origin can not be identified, an artificial or alien origin can be contemplated. "Whatever the source of these radio waves is, it's interesting to see how wide a range of frequencies it can produce. There are some models where intrinsically the source can't produce anything below a certain frequency," said Arun Naidu of McGill University in Canada, who .