An array of telescopes in Canada recently discovered a series of repeating radio signals from a galaxy about 500 million light-years away.
The so-called fast radio bursts (FRBs) last just milliseconds. Scientists are trying to trace their origin and figure out exactly what's causing them.
We took questions about the FRBs to Michael Shull. He taught astrophysics at the University of Colorado for 41 years. He's now a physics professor at the University of North Carolina at Chapel Hill.
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