What is a black hole? What does it do? Is there really one? Please use concise and understandable la

As far as our sun is concerned, it may become a black hole after death, depending on its mass, a black hole is the final stage of stellar evolution, the star will shrink after its own fuel thermonuclear reaction is exhausted, the massive one may carry out a supernova explosion to reduce its mass to slow down its contraction into a white dwarf star or neutron star, if the mass is superlarge, it will further collapse from the neutron star into a black hole, a black hole is a celestial body with a large mass and ultra-small volume, it is not a "hole" in the literal sense, it is a celestial body, Because its gravitational pull is so great that light cannot escape within its Schwarzschild radius, it appears from a telescope as a "black hole" with a radius of Schwarzschild radius", the black hole will evolve again and eventually become a singularity, which is where the universe was born To add that in fact, black holes are generally not easily observed by telescopes, and it is found that it depends on the trajectory of nearby celestial bodies.

Black holes are a kind of end to the old age of high-quality stars, the gravitational pull of black holes is so great that even light cannot escape, modern science has confirmed that black holes do exist, and every galaxy** has a supermassive black hole.

It has been confirmed that there is. The role is not clear, and it can greatly distort time and space. Black holes are thought to be formed by the collapse of massive stars.

A black hole is a very black hole, wait a minute!! I pinched my fingers and said, hey, there really is.

A huge mouth that absorbs everything, but there are times when the mouth leaks.

Black holes cannot be directly observed because light cannot escape from there.

However, the existence of black holes can be indirectly demonstrated through the phenomenon of gravitational lensing.

Is that okay?

The real world of the universe faced by human beings has three states: solid, liquid, and gaseous cyclic changes. Let's describe what is the product of the change of real gaseous stars called black holes?

Because we can't understand the black hole up close, we can only understand the reality of the three states. The solid state dissolves into a liquid state after heating, and the liquid state diffuses in a gaseous form after heating, and the gaseous state becomes a solid particle after heating. It turns out that this natural phenomenon is constantly circulating from low temperature to high temperature and from high temperature to low temperature.

Let's talk about what a black hole will look like, and let the theoretical bears say it for themselves.

Essentially, it's not because the black hole is black, it's that the surface of the black hole doesn't have a way for the light to run out and into your eyes. For example, if you walk into a dark room and you can't see the inside of the room, let's say what color the table and bench are, not because the table and bench have no color, but because you don't turn on the right, if you don't turn on the light, there will be no light reflected from the top of the table and bench to your eyes, so you feel that the whole room is dark.

Secondly, why is it a hole? In our traditional impression, the cave may be like a cave, and it should be sunken in. It's a planet, but how can it be a hole?

The problem is actually like this, that is, gravity is a thing that actually changes, and the closer you get to a planet, the greater the gravitational pull, and if you are far away from it, you may not feel its gravitational pull. So there must be such a critical distance between you and the black hole, that is, when you get close to it to a certain extent, you can't escape anymore, even if you reach the speed of light, you can't escape.

What's even more terrifying is that the black hole is black, does not emit any light and heat, and all instruments cannot detect it, unlike when we fly planes and ships, there is radar, which can detect the existence of so-called reefs or other planes to prevent collisions. You can't feel the existence of a black hole at all, and when you feel it, it's when you've already entered it, so it's hard to prevent it, but is it really the case? Is it really hopeless to enter a black hole?

In fact, this is not the case, we still have a trick, only this one trick to save lives**, what is it? It's the legendary gravitational waves.

The essence of black holes is a kind of compression of time and space, and most people talk about the most frightening thing in the universe is the black hole in the universe, and it is a veritable giant, and there are many things to talk about at the same time.

The essence of a black hole is a compression of time and space, which means that there is no end to it in a black hole.

The essence of black holes is a kind of compression of time and space, like a Big Mac, it is very scary.

I know that in my cognition, the essence of a black hole is some kind of quantum state, and it is not a specific problem.

1. A black hole is a celestial body that exists in the universe in modern general relativity. The gravitational pull of a black hole is extremely strong, allowing the escape velocity within the event horizon to be greater than the speed of light. Thus, "a black hole is a celestial body with such a curvature of space-time that no light can escape from its event horizon".

Karl Schwarzschild, a German astronomer, calculated a vacuum solution to Einstein's field equations, which showed that if the actual radius of a static spherically symmetric star is less than a fixed value, a singular phenomenon will occur around it, that is, there is an interface - the "event horizon", once it enters this interface, even light cannot escape. This value is called the Schwarzschild radius, and this "incredible celestial body" was named a "black hole" by the American physicist John Archibald Wheeler.

A black hole is a celestial body in the universe that does not reflect light at all, capable of devouring anything that comes close to it, including light.

A black hole is also a celestial body. It's just that the gravitational pull of this celestial body is too great for even light to escape its constraints, so it can't be directly observed, so it's very mysterious.

A black hole can remove everything around it and radiate that energy like a vacuum cleaner.

The vastness of the universe is unfathomable and full of wonders, and the most mysterious celestial object is the black hole. This "monster" is more ferocious than the tiger in the forest, and whatever it is, once it enters its sphere of influence, it will be devoured without spitting out even the bones. And it also wears an invisibility cloak, no one can see it, even if you shine it with a strong light, detect it with radar, and still can't find its trace.

This "monster" is a strange celestial object predicted by Einstein's general theory of relativity.