Curious Minute answer

What is the boundary around a black hole beyond which nothing, not even light, can escape?

The answer

Event horizon

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Why it's right

The event horizon is the point of no return around a black hole. Once anything crosses it, the escape velocity exceeds the speed of light, so light and matter cannot get back out.

NASA Science: black holes

Did you know?

NASA describes the event horizon as a black hole's surface-like boundary, even though it is not a solid surface like Earth or the Sun.

NASA Science: black holes

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Sources: NASA