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In 1963, the mathematician Roy Kerr found a solution to Einsteinâs equations that precisely described the space-time outside what we now call a rotating black hole. (The term wouldnât be coined for a few more years.) In the nearly six decades since his achievement, researchers have tried to show that these so-called Kerr black holes are stable. What that means, explained Jérémie Szeftel, a mathema
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