It seems like nothing else could exist because our universe is so big. Experts think we might be in a black hole with four dimensions.
Our universe began at the singularity, which is a point in space that is both very hot and very dense. Experts at CERN, like James Beecham, think that black holes in our universe may be like they are in science.
How Does A Black Hole Get Made?

When very large stars die and collapse into a mass that is so dense it is hard to imagine, they create black holes. NASA says that the event horizon is the point in space where neither light nor objects can leave or return.
The event horizon is not a new idea; it is a part of every universe that can be seen. The universe started to grow faster than the speed of light in the first trillionth of a second after the Big Bang. Before this time, there was no such thing as an absolute speed limit because there was no outer space. The growth of the universe slows down over time.
Einstein’s theory of relativity says that the area around a black hole has a curve in space and time. If black holes didn’t pull in light and heat, they would be almost impossible to see. As more things fall into the black hole, the event horizon also gets bigger.

As the black hole grows, the rate at which things fall into it slows down. Gravity is so strong that it makes things look like they aren’t moving at all. According to the theory of relativity, anything being pulled into a black hole sees time as normal.
Were we sucked into a black hole?
In our world, the event horizons of black holes with three dimensions are flat. To be an event horizon, our universe would have to be a four-dimensional black hole, according to this line of thinking. Since it is mathematically impossible for a black hole to have a single point, the event horizon can’t be calculated. The event horizon keeps track of the information that falls into the black hole with the matter that falls into it.
As the event horizon grows, a black hole’s surface area gets just big enough to hold all the information that has fallen into it since the Big Bang. Our universe is made up of this kind of information. The math works and gives answers to some of the most important questions about the universe and black holes. In 2014, research from the Perimeter Institute and the University of Waterloo showed.
It’s hard to picture our world inside another black hole. The black hole theory says that our universe may be much bigger and more chaotic than we thought before. It ties together everything that scientists and other experts have been trying to figure out for decades.