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How does the black hole event horizon calculator work?

The Black Hole Event Horizon calculator computes the distance from the center of the black hole to the event horizon based on the mass of the black hole using the escape velocity equation.

What is an event horizon?

Put simply; an event horizon is an imaginary line or surface that divides what we can possibly see from what we cannot. This does not refer to the accuracy of our measuring instruments, but rather to the limit of the knowledge we could obtain from a black hole, even with perfect instrumentation.

What is the event horizon radius of a black hole?

The object featured in the famous first picture of a black hole, the supermassive black hole at the center of the galaxy M87, has an event horizon radius of 128.35ext { AU} 128.35AU: four times the distance from Sun to Pluto. Needless to say, we are glad our stellar neighborhood is rather unassuming.

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