What is a black hole Why do black holes occur Is there really a black hole?

Black holes were first calculated by German mathematician Carl Schwarzschild, in the black hole around anything whether it is signal, light or matter can not escape, space-time here has become a bottomless pit, such a place that cannot be seen, touched or detected is called a black hole.

To know what's inside a black hole, we need something to come out of the event horizon and let us see it with a telescope. For astronomers, the easiest way to find such a thing is light, but the black hole is so massive that it can't escape light, so we can't get any information," he said, "You can go to the black hole, but once you go in there, you can't come back." ”

The creation of black holes is similar to that of neutron stars; The core of the star shrinks rapidly under the influence of its own weight, and a strong force occurs**. When all the matter in the core turns into neutrons, the contraction process immediately stops and is compressed into a dense planet. But in the case of black holes, because the mass of the star's core is so large that the contraction process goes on endlessly, the neutrons themselves are crushed into powder by the attraction of the squeezing gravity itself, leaving behind a matter of unimaginably high density.

The force generated due to the high density causes any object that comes close to the black hole to be sucked into it. It cannot be directly observed, and physicists can only speculate about its internal structure. It's like you can't measure the mass of a building directly, but you can measure it based on the mass equal to the density * volume.

What kind of properties other than the matter inside the black hole has yet to be explored.

Theoretical physicists have been exploring what exactly happens inside black holes for a long time, but their conclusions are puzzling. Even though the black hole devours all the matter and crushes it to pieces, it remains empty. All the mass of a black hole is at an infinite point in its center, which we call the "singularity".

In fact, the size of a black hole around a singularity is measured by the amount of gravitational pull it generates. When far away from the black hole, light can travel freely as usual, illuminating the sky in its path. As you get closer to the black hole, the gravitational pull becomes stronger and stronger, and eventually, even if you run as fast as light, you can't escape the gravitational pull of the black hole.

That's why there is such a large dark area around the singularity. The boundary where the gravitational pull is so great that light cannot escape, we call it the "horizon".

A black hole is a five-dimensional space. In fact, the universe is essentially a multi-dimensional space-time world, but the current space on our earth is a relatively simple three-dimensional space. The black hole is in a five-dimensional space, which can be understood as a distortion of the four-dimensional space along the fifth dimension, and is pierced along the fifth dimension in the distortion, that is, a wormhole in the five-dimensional space of the four-dimensional space.

Nature of Black Holes:No matter what kind of material forms a black hole or what shape it is, black holes have no complex properties. As soon as something falls into a black hole, the area increases; If two black holes are combined into one, then the area of the new black hole formed by the merger will be equal to or greater than the sum of the original two black holes, that is, the area of the black hole will never decrease, which is called the black hole area does not decrease theorem.