It is hard to say, but you will get crushed instantly. A black hole has so much gravity that it pulls in light and it will never escape. There are many myths to what will happen, but it will be impossible for sure until we evolve our science.
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If you were to enter a black hole, you would experience a process called spaghettification, where the intense gravitational forces would stretch your body into long, thin shapes. Eventually, you would reach the singularity at the center of the black hole, a point of infinite density where the known laws of physics break down. Your existence would effectively end at this point.
LONG before you actually entered the event horizon tidal forces would have ripped you completely apart and converted you to a gas. Therefore you would not be you when you actually passed the event horizon. However from the inertial reference frame of the gas that had once been you, nothing of any significance would happen as it passed through the event horizon other than the portions of the gas that fell in later could no longer "see" the portions that fell in earlier. It would just continue in free fall until it encountered the singularity and became part of it a tiny fraction of a second after crossing the event horizon.
I assume you mean the event horizon of a black hole (there are other types of event horizon, as well). The event horizon of a black hole is the "point of no return" - once an object crosses the event horizon, it can only go further into the black hole, not out - even it if moves at the speed of light.
In a breif answer, you get spaghettified. ( To be stretched out into a long, thin stream of atoms, like a noodle).
Nothing but when the star explodes it turns into a blackhole
the diameter is 0 km
It is quite unrelated.
You. Or your remainders, to be more precise.
The existence of wormholes has not been confirmed.