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When a black hole passes between us and a distant galaxy, the galaxy may be fine, but its image may never escape.

Since light rays may curve around the event horizon of a black hole several times, distant observers may witness multiple versions of the same object. And while this was known for decades, a student of physics at the Niels Bohr Institute has produced the first-ever mathematical expression that adequately models how black holes reflect light from the universe, according to a recent study published in the journal Scientific Reports.

And this accomplishment might one day provide scientists with replays of colossal supernovas.

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