We've known about fast radio bursts (or FRBs) for 15 years now. But nobody had seen one quite like this. A Canadian telescope detected an FRB that not only was much longer than usual, it had a distinct repeating pattern.

We learn more and more about the universe every year, and we're finding more and more things we can't quite understand. What are FRBs? Why was this one so special? And what's at the end of the discovery trail?

GUEST Marina Koren science writer, The Atlantic

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