What's going on inside a black hole? This riddle does not give an opportunity to find an answer, because no one was able to look inside this amazing space object. Nevertheless, the scientists make various guesses and assumptions that may turn out to be true in the presence of certain evidence. The specialists of the Flatiron Institute believe that there is no any secrets or mystery.
They believe that catastrophic instability is taking place at the center of the black hole. They associate their hypothesis with a singularity at the center of the black hole. They consider the center to be an absolutely neutral zone.
This is a place where matter is compressed to an infinitely tiny point, and because of that, all scientific ideas about space and time collapse like a house of cards. But it is just a hypothesis, in reality it does not exist. Instead of a singularity, something else may be present, but what exactly is unknown to the scientists. It is possible that in the depths of the black hole, the matter is not compressed to an infinitely tiny point. It is quite possible that it acquires the smallest configuration of matter, less volume.
This method is called the Planck Star. The theory assumes loop quantum gravity. By itself, it is just a hypothetical assumption that serves as the basis for creating a quantum version of the gravity. If it could actually exist, then space and time are quantized in it, and then the Universe would consist of miniature discrete parts.
They would have an incredibly small scale and all cosmic movements would seem smooth and continuous. The theory gives the scientists two advantages. The first is a dream that quantum mechanics would thus gain the basis for a concluding scientific statement, explaining gravity in a natural way. The second is to deny the formation of a singularity inside the black hole. Under the influence of the collapsing star's gravitational weight, the matter begins to contract and encounter resistance.
The discreteness of space-time does not allow it to decrease to limits less than the Planck length. And all matter that falls into the black hole eventually collapses into a ball of microscopic dimensions, but not infinitesimal. In this case, resistance delays the state of matter, preventing it from exploding and making black holes only temporary objects.
But due to the extreme time dilation effects around the black holes, it takes billions of years in the outer universe before they begin to collapse. It leads the scientists to believe that black holes do not have specific systems of behavior, and endless catastrophic instability can occur inside them.