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No naked black holes

Even high-speed mergers keep an event horizon

2:23pm, October 3, 2008
No matter how hard you try to push their boundaries, black holes always seem to preserve their modesty. Indiscreet astrophysicists have simulated the most violent collisions of black holes yet, and found that the resulting black hole still has an event horizon — the surface through which even light cannot escape and that hide black holes’ interiors.

An international team of researchers created a computer simulation of what they call the most violent collision imaginable: Two black holes of equal masses smashing into each other head-on, moving at close to the speed of light.

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