At a certain distance, light rays passing a black hole may or may spiral into orbit around the cosmic finsterling and then disappear forever into the rest of the world. In addition, computer simulations have shown the glow of a heated gas and dust disk around a rotating black hole being emitted behind the gravity monster. The room here is so bent that you can literally look around the corner.
For the astronaut who would boldly embark on a journey into a black hole, this "hell-trip" would be something like this: From the slowing down of his own time - compared to the way he lives on earth - he does not notice. Instead, the clocks of those left behind start racing for him. The environment gains a peculiarly distorted shape, the colors are shimmering and the gravity of the black hole is drawing ever harder on its spaceship. In a black hole that is only a few times as heavy as our sun, the tidal forces are so strong that the astronaut and his ship is stretched like spaghetti and torn a little later.
With large black holes, as they sit in the centers of the galaxies, the density at the event horizon is so small that the daring astronaut can safely cross this "place of no return". All the light of the universe finally shrinks to a small, glittering disc above it. For a few minutes, the astronaut can still explore the interior of the cosmic darkling. For the outside world, however, the discoveries of the death candidate would be of no value, because his radio signals can never leave the gravity field of the black hole. display
Of course, the foolhardy astronaut will no longer know what happens to matter inside a black hole: even its own atoms can not survive the fall into the center. Will their rubble finally be destroyed or will they reappear somewhere else, maybe even in a strange universe? A similar difficulty arises in the question of what happens to the information contained in the collapsing matter. It is possible that fundamental conservation laws of physics are violated in the black hole. All answers to such problems are so far pure speculation.=== Rüdiger Vaas