In September 2014, when astronomer Iair Arcavi found a new supernova in the night sky, he didn’t think much of it. It looked like any other star that had just died and violently burst apart. The object had brightened some time ago, and now it was fading — a sign that the explosive event was coming to an end. Since the juiciest part seemed to be over, Arcavi abandoned the star in search of supernovae that had exploded more recently.
But robotic telescopes continued to monitor the star over the next couple of months, just in case anything interesting happened. Then, in early 2015, Arcavi asked a student to look through telescope data to see if any of the stars they had found might be acting strange. Sure enough, that “ordinary” supernova...
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