What defines the physical state of a black hole?

Answer

A region of infinite density where gravity prevents light escape.

A black hole is the result of the total gravitational collapse of a massive star's core. When the remnant is too massive for the density of neutrons to halt the collapse, it shrinks into a point of infinite density. The gravitational pull becomes so intense within this region that nothing, including light, can escape its reach.

What defines the physical state of a black hole?

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