What happens inside a black hole?

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Ok now, so, Black holes are basically huge forces that use enormous gravity to distort the fabric of space time. It's gravity is so large that no known particle can escape it.
A black hole become visible (leaves a 'shadow') when it starts feeding. Gas trapped in it's accretion disk becomes so hot (as it spins with almost the speed of light) that it gives out extremely bright light. Past the event horizon, nothing can escape, not even light, that's why it's black.
The central part of the black hole is the Singularity. No one can really explain what goes on in there, the singularity is practically a place where physics is gone mad. Space and time cease to exist, gravity tends to infinity, etc.
The only theory that can explain what happens in a black hole is Quantum Gravity, but with the science we know right now, it's a little yahooo to make sense and that lead to the information pardox.

Basically, the black hole information paradox results from the combination of quantum mechanics and general relativity. It suggests that physical information could "disappear" in a black hole, allowing many physical states to evolve into precisely the same state. This is a contentious subject since it violates a commonly assumed tenet of science—that in principle complete information about a physical system at one point in time should determine its state at any other time.

In 1975, Stephen Hawking and Jacob Bekenstein showed that black holes should slowly radiate away energy, which poses a problem. One would expect the Hawking radiation to be completely independent of the material entering the black hole. Nevertheless, if the material entering the black hole were a pure quantum state, the transformation of that state into the mixed state of Hawking radiation would destroy information about the original quantum state. This violates Liouville's theorem and presents a physical paradox.

More precisely, if there is an entangled pure state, and one part of the entangled system is thrown into the black hole while keeping the other part outside, the result is a mixed state after the partial trace is taken over the interior of the black hole. But since everything within the interior of the black hole will hit the singularity within a fixed time, the part which is traced over partially might "disappear", never to appear again. Of course, it is not really known what goes on at singularities once quantum effects are taken into account, which is why this theory is conjectural and controversial.

Hawking was convinced, however, because of the simple elegance of the resulting equation which "unified" thermodynamics, relativity, gravity, and Hawking's own work on the Big Bang.

There are various ideas about how the paradox is solved. Since the 1997, the predominant belief among physicists is that information is preserved and that Hawking radiation is not precisely thermal but receives quantum corrections. Other possibilities include the information being contained in a Planckian remnant left over at the end of Hawking radiation or a modification of the laws of quantum mechanics to allow for non-unitary time evolution.

In July 2005, Stephen Hawking published a paper and announced a theory that quantum perturbations of the event horizon could allow information to escape from a black hole, which would resolve the information paradox. His argument assumes the unitarity of the AdS/CFT correspondence which implies that an AdS black hole that is dual to a thermal conformal field theory, is unitary.

I had more to write but i can't fit it in here, as Yahoo! dosen't let me post more.
I hope that answer satisfies your curiosity....Show more

A black hole is a region of space where the escape velocity is larger than the speed of light. That means that any light generated inside it has no means of escaping. That's why WE DON'T KNOW what goes on inside a black hole, and all those complicated physics equations that people abhor can only be used to SPECULATE on goes on inside it.

Even those things about being the entry doors to new universes or connecting multiple universes are nothing more than speculation. You can think anything you want from it, you won't be any better at that than other scientists....Show more

A Black Hole is a spherical region (volume) of space surrounding a Singularity where the gravity of the Singularity is so strong that everything (including light) gets pulled down into the Singularity (hence the use of the term "Hole"); and nothing (not even light) can escape the gravitational pull of the Singularity (hence the use of the term "Black"). The distance from the Singularity where light cannot escape is called the Event Horizon. The Event Horizon defines the outer boundary of the Black Hole. A Singularity is a point in space with no volume and infinite density. It is formed from the collapse of a giant star (many times the mass of our own Sun). The gravity of this star is so strong that the collapse continues past the point of maximum atomic density (protons, neutrons, and electrons touching) to a point of no volume and infinite density. The reason the gravity of the Black Hole at and inside the Event Horizon is so strong is because it is so close to the mass of the Singularity. And, as you know, the closer you get to the center of mass of an object, the stronger the gravitational pull of that object. The diameter of a lower-end Super-Massive Black Hole (100,000 times the mass of our own Sun) is about 190,000 miles. Less than the distance from the Earth to the Moon. The Super-Massive Black Hole at the center of our Milky Way Galaxy could fit between the Earth and the Sun. ....Show more

What happens deep within a black hole is totally unknown because we have no means to investigate those regions. Even the known laws of physics can't be applied. There are all kinds of ideas, like white holes on the other side of a black hole, gateways to other dimensions and/or universes, etc.,. but anyone who claims to *know* what goes on within a black hole is doing nothing more than blowing smoke....Show more

A black hole is literally an object.. It's not like a dead end in space.

It's a star who's collapsed on itself, and continues to do so.. Making it have an infinite gravity - such that not even light can escape.

There's debate as to whether or not the universe started from a black hole, but it's generally accepted that it wasn't a black hole, it was something else that we don't know!...Show more