Question

what is inside a black hole

Answer 1

We can't estimate or not yet proved by scientists aboout the matter inside the black hole. As all says, that matter get attract by the black hole, that's true. but some matter get piled up at the centre of the black hole which we didnt discover yet. Because neither a light ray nor a material from it never reached earth. But according to scientists, quantum physics can help in this matter by quantum gravity, if we know how the quantum gravity works. but it became a mystery yet. Hope scientists will find out it soon...

Answer 2

a black hole has a boundary called event horizon.
it is where gravity is just enough to drag light back and prevent it escaping. Because nothing can travel faster than light, everything else will get dragged back also.