For the second time ever, astronomers have detected a pattern in a mysterious fast radio burst coming from space.

Fast radio bursts, or FRBs, are millisecond-long bursts of radio waves in space, and astronomers have been able to trace some radio bursts back to their home galaxies. They have yet to determine the actual cause of the bursts. Individual radio bursts emit once and don’t repeat. But repeating fast radio bursts are known to send out short, energetic radio waves multiple times. Previous observations showed that usually when they repeat, it’s sporadic or in a cluster.

That all changed earlier this year when astronomers found that FRB 180916.J0158+65 had a pattern in bursts occurring every 16.35 days. Over the course of four days, the signal would release a burst or two each hour. Then, it would go silent for another 12 days.

Now, they have detected a pattern in a second repeating fast radio burst, known as FRB 121102. During this cyclical pattern, radio bursts are emitted during a 90-day window, followed by a silent period of 67 days. This pattern repeats every 157 days.

FRB 121102 has been known as a repeating fast radio burst since 2016. Now, they know it has a pattern.

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