What is a black hole I believe is beyond words, what kind of scene will a person see when he falls into a black hole?
Friends who have seen Interstellar may have some impressions.
But science fiction is science fiction after all, and even if the lineup of scientists' advisory board is strong, it still has to enter the fantasy that has no scientific basis in the end - Cooper fell into the black hole and entered the five-dimensional space and returned to his home.
So what does a person really look like when they fall into a black hole?
This animation from a foreign video site is probably the most realistic simulation and may help you understand the problem.
As you get closer and closer to the black hole, you'll see a fascinating distortion of the space around you, like a giant cosmic lens that pushes all the starlight around you away.
Of course, the distortion may not be very obvious at this time, but when you get closer, the distance from the black hole is only 1/2 of what you just did, you will find that the size of the black hole seems to increase by 2 times;
Half way closer, the black hole becomes 4 times the size of the original.
By this time you should have noticed that the black hole seems to be expanding much more than you expected, because the space-time around you is violently distorted.
Then you will find that around the large disk of the black hole's pitch-black color, the distant stars are twisted into shuttles, rotating around the black hole, and you can clearly see the distortion of space-time, and the farther away from the black hole, the more normal the starry sky is.
You get closer and closer, closer and closer to the black hole's event horizon, at this time those distant stars will also be distorted and deformed, and the black hole's event horizon will expand to your entire front field of vision, and the size will appear to be much larger than it actually is.
Because the distortion of gravity is ready to make your world a complete reversal — the moment you cross the black hole horizon, the whole world will shrink into a tiny circle like the shutter of a camera lens, and then close behind you.
This is your last chance, let's assume that you are in a spaceship with infinite solidity and infinite power, and in the instant before reaching the black hole event horizon, you turn the bow of the ship, break free of the huge gravitational force, and fly back into our world.
However, the world has become unrecognizable, the expansion of time has brought you to the Earth many years later, you can no longer find your own home, human beings may have evolved beyond recognition, and you will become an alien on your own planet completely.
But this is obviously different from the hypothesis of the title, because you are not falling into the black hole, and if you must insist on snooping on the secrets inside the black hole, you may be able to cross the black hole's event horizon without hesitation.
Then in the last instant, due to the blue shift effect of gravity, you will see the space-time outside the black hole quickly change from black to blue, and rapidly expand, and finally the black curve of the entire edge of the black hole flips over and becomes a circle that shrinks toward you, instantly closing behind you.
In the moment before closing, you will finally see the aperture that shrinks into a small dot change from red to white and then to blue.
This is due to the fact that both the cosmic microwave background and the radio background shift to the visible position of the spectrum, giving you one last glimpse of the universe you once lived and fought in.
And then...... Then there is no then, no one knows what you can see, not even the greatest scientist.
Because inside the black hole event horizon, no information can be transmitted, and whoever depicts the interior of the black hole is only assumptions and conjectures.
The best outcome you can pray for is, like Cooper, to go to five-dimensional space, and then, like a ghost, go back to where you left, look at your children, scare them by the way, and then appear beyond Jupiter's orbit, around that black hole—who knows how the black hole spits you out.
It's a complete fantasy, so even the slightest bit of wisdom you should never put yourself inside a black hole.
While you may be the first to know the secret of a black hole, no one will ever know that you know that secret, so what's the point?
Stay tuned: