SUMMARY: A team of astronomers from MIT and Harvard have observed that a certain kind of explosion seen on neutron stars is never seen coming from black holes. This is strong evidence for the existence of a black hole's event horizon; the point at which nothing, not even light, can escape from its grasp. The observations were made using NASA's Rossi X-Ray Timing Explorer, which detected 135 explosions from suspected neutron stars, but none from 18 possible black holes.

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