What is the nature of black holes? Do you know what the nature of black holes is?

Personally, I think that it is necessary to distinguish between black holes and singularities first.

A black hole is first and foremost a celestial body with a gravitational enough force to escape at a speed greater than the speed of light. A singularity, on the other hand, is an infinitesimal point with a full latitude.

Black holes don't have to be singularities. Even, black holes can be very large. Through the calculation of gravitational force, it can be found that as long as the volume of a celestial body with a certain density is large enough, the escape speed of the surface of the celestial body will also exceed the speed of light.

Of course, a celestial body that escapes faster than the speed of light must have a gravitational pull large enough to crush the repulsive force between any particles of matter. In other words, any black hole will inevitably collapse eventually, and it will inevitably collapse into a singularity. But it takes time to collapse.

The most typical example is our universe, which is based on the idea that the universe was born from a big one, and that there are two possibilities for the fate of the universe. If the density of matter in the universe is less than the critical density, the universe will expand indefinitely, and if the density of matter in the universe is greater than the critical density, the universe will eventually shrink.

Then we can find that because the expansion rate of the universe is close to or reaches the speed of light, then if the density in the universe is large enough that it will eventually collapse (just for example, our universe may not be like this), this means that the "escape speed" of the universe must be greater than the speed of light. It is clear that the universe itself is a black hole, a black hole that is expanding, but will eventually collapse into a singularity. We live in this black hole.

So. We can now think about it the other way around. Could there be a universe inside a black hole? Or can a singularity accommodate a universe?

The singularity is a point that both exists and does not exist in physics, externally it is infinitesimally small, but internally it has a complete dimension of space and time. We say that the universe is the sum of time and space, and for the singularity, it is also the sum of space and time. Therefore, the singularity can fully accommodate infinitely complex structures and information.

And the black hole itself has a huge amount of energy and matter.

So is it possible to form a universe inside a black hole? Or is it possible for black holes to form universes that are both infinitely small and infinitely large?

The essence of a black hole is the formation of an extremely dense singularity after the collapse of the star. A black hole can theoretically be said to be a singularity, a point with zero volume and infinite density.

The essence of a black hole can be thought of as a singularity with a volume of 0 and extremely dense density, which is formed by the collapse of stars.

The essence of black holes is the garbage disposal plant of the universe. Black holes suck up all the cosmic garbage and dispose of it until they can suck up a galaxy.

Heavenly body. Because a black hole is a planet to put it bluntly, but the density and gravity are very large and can absorb everything, just like a bottomless pit, so it is called a "black hole".

The essence is a very dense star, and the gravitational pull on its surface is very large, and when its gravitational pull is so great that even an object moving at the speed of light cannot get rid of its constraints, it becomes a black hole.

The essence of black holes is a bottomless pit. All matter near it will be swallowed by it, including massive stars, which cannot be avoided and cannot be traced after being swallowed.

Scientists are free to express this question as much as they like. It's all scientific behavior.

I have time to read my article "Truth and Falsehood in the Universe.""Black holes""Why do you say that?"Gravitational waves"And doesn't exist? 》…Look"A jasper orchid chasing stars in Lingjing Lake"Can.

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.

We know that the gravitational pull of a celestial body on an object is inversely proportional to the square of the distance from the object to the center of the celestial mass, that is, the gravitational force increases sharply as it approaches the center of mass. When approached to a certain distance, the gravitational force of the large light cannot escape, then this distance is called the Schwarzschild radius. Schwarzschild radius is a physical quantity that exists in any object with mass, and its meaning is the minimum radius that the object can reach by compression.

Then we can imagine that there is a virtual sphere inside an ordinary celestial body, and the radius is the Schwarzschild radius. This distance is very small for ordinary celestial bodies, for example, the Schwarzschild radius of the Sun is about 3 km, while the Schwarzschild radius of the Earth is only 9 mm. Moreover, the Schwarzschild radius is only related to the mass of the object, and when a celestial body is continuously compressed, causing the density to increase until all the mass can be placed within the Schwarzschild radius, the object is a black hole.

In other words, a black hole is an object in which all mass is concentrated within the Schwarzschild radius.

The essence of a black hole is a dead star, due to the exhaustion of fuel inside the dead star, the energy is not enough to support the huge shell mass, the shell continues to collapse to the inside of the core to cause a strong large**, when the final radius of the star is less than the Schwarzschild radius, and finally form an extremely dense, extremely strong gravitational object. When light passes through a massive celestial body, because the time and space around the massive celestial body will have a certain distortion, and this distortion will become more and more serious with the increase of the mass of the celestial body, so the deviation of the light when the light passes through the mass celestial body will become more serious, because the gravitational pull of the black hole is extremely large, the time and space around it form a great distortion, and even the light cannot escape from it, and we cannot directly observe it from space, so the academic community calls it a "black hole".

Black holes are an extreme field of scientific research, and many conventional mechanics and physics are not applicable to them.

The essence of black holes is gravity, what is the reason for the formation of large gravity? Is it quality? Is it a vortex? None of this can be confirmed.

It's a very massive star that collapses at the end of its life, making it so small in radius, so much denser, so that it has a strong gravitational pull and forms a black hole.

The mass of the star exceeds the mass of the sun, and in the late stage, because the mass itself is too large, all the material on the surface of the star and within the gravitational range is sucked into its own interior, and it keeps collapsing, and finally forms a singularity with infinite mass and infinite space.

The mass is so great, the density is so great, the gravitational pull is so great that even light cannot escape his captured celestial bodies.

According to the theory of relativity and quantum theory, the essence of a black hole is a vortex.

A singularity ...... into which massive stars collapse

The last form of a star is infinitely small in size and infinitely large in mass.

A black hole is a celestial body that has a surface escape velocity of or more than the speed of light.

The surface of a black hole, the level at which the escape velocity is exactly equal to the speed of light, is called the event horizon. It is equivalent to a one-way membrane (in which no matter actually exists), and external matter, including light, can only enter the event horizon and cannot escape from it, because no matter can move faster than the speed of light.

A black hole has only three parameters, mass, charge, and angular velocity (angular velocity of rotation). To the outside world, these three parameters can perfectly describe a black hole.

The average density of a black hole (calculated in terms of its event horizon radius) is related to its mass, and the larger the black hole, the lower the average density. The average density of supermassive black holes even reaches the level of interstellar gas. But this is only its average density, most of the space-time inside the black hole is free of matter, only its center has a singularity, which is a space-time region with infinite curvature of space-time, tidal effects and infinite density of matter.

Even an object with infinite density has an infinite mass, so it produces a huge gravitational force that can even absorb all the light.

A black hole is essentially the remains of a dead star, because when the star's nuclear fusion power is gone, it collapses due to gravity, and finally collapses into an object that is invisible to the naked eye, with an infinite gravitational force and an infinitely small density.

Celestial bodies compressed by stars in their later years.