What can be detected within the event horizon a black hole?

Answer 1

Nothing can be detected within the event horizon of a black hole.

Since nothing, not even light, can escape from the event horizon of a black hole, it is impossible for us to see beyond the event horizon without passing through it and never being able to return.

Black holes defy the laws of physics as we currently understand them, though this could change in the future.

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Answer 2

Theodore Angelis

It is theoretically possible that nothing can be seen or measured inside a black hole's event horizon because of the strong gravitational attraction that keeps even light from escaping.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.