The white hole is a celestial body opposite to the black hole, which is considered to be left over from the Big Bang. Different from a black hole, the matter inside a white hole (including radiation) can be emitted to the outside through the boundary, but the matter outside the boundary cannot fall into the white hole. So the white hole is like a fountain, constantly spraying material (energy) outward.

Simply put, the white hole can be said to be a black hole in reverse time. The matter that enters the black hole will eventually come out of the white hole and appear in another universe. It is called a "white" hole because it has completely opposite properties to a "black" hole. It has a closed boundary. The matter gathered in the white hole can only move outward, not inward. Therefore, the white hole can provide matter and energy to the external area. But it can't absorb any matter and radiation in the external area. White hole is a strong gravitational source, and its external gravitational properties are the same as those of black hole. White holes can accumulate the surrounding material to the boundary to form a material layer. White hole theory is mainly used to explain some phenomena of high-energy celestial bodies. Physicists at the University of Oregon in Europe say that there are probably white holes in the universe. Black holes will gradually disappear over time. In the process of disappearance, the substance will be released in the form of Hawking radiation, but when the "white hole" disappears, it will not absorb or release any substance. Therefore, "white holes" usually do not exist alone in an empty space, but mostly explode in some radioactive materials, which makes it impossible for us to observe the signs of "white holes"