- For about four days, the radio waves would arrive at random. Then, for the next 12, nothing.
Then, another four days of haphazard pulses. Followed by another 12 days of silence.
The pattern—the well-defined swings from frenzy to stillness and back again—persisted like clockwork for more than a year.
Dongzi Li, a doctoral student at the University of Toronto, started tracking these signals in 2019. She works on a Canadian-led project, CHIME, that studies astrophysical phenomena called “fast radio bursts.” These invisible flashes, known as FRBs for short, reach Earth from all directions in space. They show up without warning and flash for a few milliseconds, matching the radiance of entire galaxies.