A black hole is a compressed planet, how big is it?

Personal understanding! Black hole theory: black holes are produced by the exhaustion of aging superstars after they are exhausted and cannot be replenished with energy, because the central energy changes dramatically and then quickly erupts and loses to the poles with weak gravity, but the strong gravitational force still exists, but the sudden eruption of its internal energy disappears and produces a gravitational hole {black hole}.

Because he's hollow gravity, he needs to fill himself up again, don't ask me why, uh, because that's all I can think of! This kind of black hole cannot be swallowed infinitely, the possibility that it will be filled is absolutely existent, and Jiang will become substantial or void is the final form. His pressure can push everything "back into nothingness!"

I think that the gravitational pressure of the superstar can be carried by the negative expansion of the hollow gravity brought about by the eruption, which I understand to be a black hole. What kind of suction and pressure will he bring! So what happens to the substance when it is under the action of super suction + super pressure?

According to my opinion, it is nothingness, and nothingness is cosmic space. It may also be a driving force that provides the expansion of the universe. Then it can be understood as:

Every black hole that becomes nothingness is the expansion of the universe, what scientists call dark matter energy, and this is the role played by black holes. Speed + pressure beyond the limit = what? Added:

Superstars erupt in a way that erupts at the poles, because these two directions are the weakest points and will not be the other circumferential range around the planet. Because the gravitational force in these directions is too large, the powerful void (black hole) formed after the energy is released will suck all the material on the gravitational surface of the planet (all surfaces except the eruption} into it, which is probably one of the reasons for the collapse. And the nebulae and planets that appeared around him after the collapse of these superstars we saw may be that the original planet spewed out the eruption energy beyond the gravitational range of the original planet, and then the black hole completely swallowed everything around it!

In the process of eventually becoming nothing, the energy and planets of these gravitational ranges are concentrated around the periphery, thus forming galaxies or small asterisms! Of course, the gravitational pull of the black hole exceeds that of the original superstar, and its suction force should act on a large scale in the eruption range of the poles, and the super gravitational range should be hindered by the spiral nest and become slow. The process of the disappearance of black holes has not yet been fully envisaged!

It may be that his suction power has reached a point where even he can't bear it, and he returns to nothingness, which is the reason for the expansion of the universe. The above is one of the states of black holes, and now science has no good explanation, it is just speculation, so it is possible that my idea is true.

It's a singularity, there's no volume, it's just mass, angular momentum, and charge. If you want to ask, you can only ask how big the edge of its horizon is.

Black holes are mostly formed by the collapse of stars, and if the star is big, then the black hole is big. So the size of the black hole is determined by the early evolutionary star, and I also think that it will absorb matter and grow.

Not necessarily, "A Brief History of Time" has a detailed description.

There are also black holes, which are formed by the collapse of a star.

The external volume measurement is not scientific, and the space-time around the black hole has changed, and the volume measurement standard is already different.

Say no, you ask the experts

I'm going to see it.

A black hole in the universe is about a kilogram in mass, which I think is relatively light, but it's actually very large.

Black holes in the universe occupy 100 million masses, which can be said to be quite a lot, and black holes are also very scary existences.

The universe is infinitely friendly, boundless, endless, and beginningless. The universe is the universe of material things, and there is infinite mass and energy in the universe. The black hole is nothing more than a giant in the universe! Quality can only be a speck of dust!

There is no way to judge, there are so many black holes in the universe that there is no way to count them, and there are big and small black holes, so there is no way to count them.

Theoretically, an object of any mass can become a black hole. As long as the Schwarzschild radius at that mass is reached.

This value was first calculated by the German physicist Carl Schwarzschild and is expressed as: r=2gm c 2. where r is the Schwarzschild radius, m is the mass, c is the speed of light, and g is the gravitational constant.

According to this calculation, the Schwarzschild radius of the Sun is about 3 kilometers, which means that if the Sun is compressed into a sphere with a radius of 3 kilometers, it will become a black hole.

The Schwarzschild radius of the Earth is only about 9 millimeters, which is the size of a small glass sphere.

As the most mysterious existence in the universe, black holes have a strong gravitational pull, so that light cannot escape the attraction of black holes by virtue of its own propagation speed, and black holes are the world's top ten unsolved mysteries for human beings. In 2008, astronomers discovered a super black hole in the vast universe, the OJ287 black hole, which is the largest black hole ever discovered in human history.

The largest black hole in the universe is 3.5 billion light-years away from Earth, six times larger than the largest black hole ever recorded in human history, and astronomers have calculated that the mass of this black hole is about 16 billion times that of the Sun. OJ287 is still "devouring" any matter that exists around it, this devouring behavior has been formed since the beginning of the universe more than 10 billion years ago, after slow accretion to form, the current volume of this black hole is already equivalent to the volume of the entire Milky Way, if the Milky Way is close to this super black hole, OJ287 can easily swallow the entire Milky Way with its own gravity.

Black holes cannot be directly observed, only according to indirect ways to know its existence, and the discovery of this late spring black hole is also through the OJ287 black hole peculiar double black hole system, in the records of astronomers, this huge black hole itself has two black holes, because of the collision produced 12 times of light, it is through these 12 flashes that mankind can understand the existence of this huge black hole. According to Einstein's relative reduction, the two black holes of OJ287 will have a gravitational pull on each other, causing the two black holes to get closer and closer, and then a mass collision will occur, allowing OJ287 to produce bright light.

Astronomers believe that although black holes pose a certain threat to the Earth, black holes also helped the formation of the Milky Way, and it is the huge gravitational pull generated by these black holes that allows the vast universe to form one galaxy after another.

Black holes are extremely complex objects, and countless physicists such as Niuma Neten, Einstein, and Hawking have spent their lives studying black holes, trying to find the secret behind black holes about the origin of the universe. At present, the world's first artificial black hole has been born, and the largest black hole in the universe, I don't know what kind of impact it can bring to the earth, I hope that with the progress of human science and technology, we can explore more secrets of the universe.