Theoretically, it exists. The current view of the mainstream physics school is that the world is a ten-dimensional space-time. We only live in a four-dimensional space-time. In a sense, time and space are integrated. Our time Cone tells us that within the scope of human consciousness, we can only survive in this dimension of time and space. When simulating the explosion of the universe in experiments at the European collider, it was found that there are space-times from one to ten dimensions, but other space-times are unstable. Only four-dimensional and seven-dimensional space-time are relatively stable. In order to unify universal gravitation and other microscopic Basic force, imagine that there are other spaces around us, but we have no way to detect it. The reason why gravity is so weak is because it is stronger in other spaces, which makes the gravity of our space difficult to unify with other forces. , it’s like using a nail to poke a piece of white paper. Creatures living in a two-dimensional space cannot understand why a point has such great pressure. But for us, this is easy to understand. This is why it is difficult for us to understand. Understand concepts such as infinite mass, so other spaces still exist, and maybe we can reach them through black holes. In that space, the speed of light is the slowest speed, so our space is limited by the speed of light.