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The distance from a simple black hole's center to the event horizon where escape velocity equals the speed of light is called the Schwarzschild radius, named after the mathematician who solved the relevant field equation from Einstein's theory of General Relativity. The distance can be calculated for a known mass using twice the product of the gravitational constant and the mass, divided by the square of the speed of light.

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8y ago
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14y ago

The Event Horizon.

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14y ago

That's called the event horizon.

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