'Repeating' mysterious signal detected from distant galaxy...
While looking for signs of intelligent life in the universe, astronomers have detected 15 fast radio bursts from a distant galaxy.
These poorly understood phenomena are short pulses of radio emission, just milliseconds long, believed to be coming from rapidly spinning neutron stars or black holes in distant galaxies. A less popular theory is that they're signs of extremely powerful spacecraft from alien civilizations.
This particular fast radio burst (FRB), called FRB 121102, is of particular interest as it is the only known one to be repeating, something that astronomers can't yet explain.