A mysterious signal coming from deep in the universe has finally been traced to its source.

Fast Radio Bursts, or FRBs, have only been heard 18 times and have been a puzzle to scientists since they were detected in 2007. Nobody knows where they could be coming from or how they might be triggered, with speculation ranging from a huge star, jets of material shooting out of a black hole – or even aliens.

FRBs are powerful but very short radio waves, which last no more than a millisecond.

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