Mysterious radio signal tracked to its source

A second example of a repeating fast radio burst (FRB) has been traced to its origin — a nearby, “fairly ordinary” spiral galaxy. FRBs last for only milliseconds, making them incredibly difficult to trace — only four have been localised, including one other repeating one. The newly measured FRB’s home galaxy is quite different from those of the other four, deepening the mystery of what causes the extragalactic signals.