What is the term for the boundary marking the region of spacetime where gravity is so strong that nothing, not even light, can escape?

Answer

The event horizon

The event horizon is defined as the boundary surrounding a black hole beyond which escape is impossible, even for light.

What is the term for the boundary marking the region of spacetime where gravity is so strong that nothing, not even light, can escape?

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What If Earth Were Sucked Into a Black Hole? - YouTube

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