Colliding black holes may have created a surprising flare of light

In spite of their dark reputations, two black holes may have set off a cosmic light show. Subtle gravitational rumbles from a collision of two black holes may have been accompanied by a flare of light about a month later, physicists report June 25 in Physical Review Letters. It’s a surprising conclusion given black holes’ propensity to swallow up light and matter. “The normal expectation has been they just merge and all you would detect is gravitational waves,” says astrophysicist Matthew Graham of Caltech.

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