The Deep Synoptic Array-10, which spotted the burst, is located at the Owens Valley Radio Observatory. (Credit: Caltech/OVRO/Gregg Hallinan)

Fast radio bursts, or FRBs, are one of astronomy’s hottest topics — and biggest mysteries. These brief bursts of radio waves from outside the Milky Way typically pop off for only a fraction of a second, then disappear forever, never to be seen again. Only two FRBs have ever been caught repeating, one of which astronomers traced back to its home galaxyin