Astronomical problems, about black holes in A Brief History of Time 10

Where gravity is extremely strong, nothing can escape from it, not even light. Black holes can arise from the "death" of massive stars, and when a massive star exhausts its nuclear fuel and reaches its final state of evolution, the star becomes unstable and undergoes gravitational collapse, and the weight of the dead star's material is violently squeezed inward in all directions, and when the gravitational force is not opposed by any other repulsive force, the star is pressed into an isolated point called the "singularity". The details of the structure of black holes can be calculated using Einstein's general theory of relativity, which explains that gravity bends space and slows down clocks, the singularity is the center of the black hole, and the gravitational pull around it is extremely strong, and the surface of the black hole is often called the event horizon, or the Schwarzschild radius of a stationary spherical black hole, which is the boundary between those space-time events that can communicate with distant events and those that cannot be transmitted because the signal is captured by a strong gravitational field.

Under the event level, the escape velocity is greater than the speed of light. The research on mathematical models is quite complete.

I don't look at the brief history of time for many years.

If you're interested, take a look, it's all there.

Black holes are inherently mysterious, and what happens around them is not mysterious.

There are too many questions, it's not good

The hypothesis that the evaporation of the black hole originates from the vacuum energy, and the positive and negative particles are created at the edge of the black hole, and the negative particles are absorbed by the black hole, and the positive particles escape from the black hole"Evaporation"Finish.

It's all my own opinion, black holes are too mysterious, many problems have not been solved, and it is difficult to sleep.

First of all, it is stated that the miniature black hole can evaporate, not that the black hole meets the evaporation condition!

Miniature black holes were created when the universe exploded, under external conditions, not due to gravitational collapse, and now miniature black holes are basically non-existent!

Lovely question.

Theoretical physicists have already begun to refute Hawking's arguments.

This kind of imaginary conclusion should not be thought of when you think about it.

Strictly speaking, a black hole cannot be said to be made of.

It is formed due to the warping of space-time caused by the collapse of the star itself, and the more the star shrinks, the more the space-time warp becomes, and then the gravitational force becomes immeasurable, thus forming a black hole.

It is recommended to read "A Brief History of Time", which is very detailed.

There is no conclusion at the moment, only doctrine. If anyone has evidence, it is estimated that he is an immortal who is hundreds of millions of years old.

It is speculated that black holes also evolved from stars. According to scientists' conjectures, matter will march inexorably towards the central point until it becomes a "point" with zero volume and infinite density. And when its radius shrinks to a certain point (Schwarzschild radius), the huge gravitational pull makes it impossible for even light to shoot outward, thus cutting off all contact between the star and the outside world – and the "black hole" is born.

Usually, the star originally contains only hydrogen, and the hydrogen atoms inside the star collide with each other and fuse. Due to the massive mass of stars, the energy produced by fusion competes with the gravitational pull of the stars to maintain the stability of the star structure. As a result of fusion, the internal structure of the hydrogen atom eventually changes, ruptures and forms a new element, helium.

Then, the helium atoms also participate in fusion, changing the structure and forming lithium. By analogy, according to the order of the periodic table, beryllium elements, boron elements, carbon elements, nitrogen elements, etc. will be produced in turn. Until iron is generated, the star will collapse.

This is due to the fact that iron is quite stable and cannot participate in fusion, and iron is present inside the star, which causes the star to not have enough energy to compete with the gravitational pull of the massive star, which causes the star to collapse and eventually form a black hole.

Black holes are very abstract for us, Hawking put forward the idea of black holes after it was confirmed that there are black holes, so what kind of concept is a black hole, first of all, it is caused by the collapse of the star, the star may be due to the excess of its own load, it will increase in density, decrease in volume, and the star will occur to a certain extent**,**At the same time, a black hole will be produced (I don't know why it is generated, but it is true), Then the black hole becomes larger and larger by absorbing the energy of the star and the surrounding body, and the largest black hole found so far is as large as tens of billions of suns (it seems to be proposed by Hawking), of course, you must also know that the black hole and the black hole will become a larger black hole after mixing, the black hole is actually equivalent to the digestive system of the universe, and nothing wants to escape from the palm of his hand, even a small atom will be torn apart after entering the black hole, and the chance of survival after entering the black hole is very small, which can be equal to the probability of fishing for a needle in the sea (of course, It may be much smaller), but if you survive, you will be transported to another world, which is connected by a white hole (a view supported by many scientists). And all the physical principles of our real life in black holes will fail, well, I know so much about black holes, of course, if humans can master black holes, then interstellar travel can also be realized.

Upstairs, the current theory is biased towards the possibility that a supernova may have formed a black hole. Technology is currently not available for research.

Black holes are formed when an aging star collapses.

It is formed by the star becoming a red giant, and the red giant collapsing and compressing. Sideline: The volume of a black hole is equivalent to 0.

1.I don't know, the lack of intermediate-mass black holes is a hot topic in astronomical research at present, and I don't know if the author lives in the east world.

Remember, it is the core quality left behind.

The ray burst occurred on December 14, 1997, numbered "GRB971214", and the location of the ray source was "1sax, with the front half being right ascension and the back half being declination, and this location was located in the constellation Deer Leopard.

Give a definite sentence (the transfer of orbits between celestial bodies) is good or not......All tracks, if not taken into account friction and perturbation, do not require energy to maintain.

Inexplicably, astronomy and mathematics, physics and chemistry belong to the six basic natural sciences together, and they intersect with each other and do not belong to each other. And they follow the same set of logic, based on observations and experiments, to formulate hypotheses, and to verify hypotheses ......B was chosen purely because the intersection of astronomy and physics is relatively large.

Finally, there is an uncontroversial issue.

Callisto, Titan, Callisto, Europa are all larger in diameter and mass than the Moon.

The author's astronomical skills are very average, both in terms of astronomical basis (there are many controversial issues) and language (4, 5, 7 lack the necessary definite terms), and in terms of understanding the frontiers of astronomy and the scientific method.

Cognitively. There was also a ray burst in 1997, and I can't remember even the most hardcore enthusiasts, and it was purely a test of the ability to search for information. Anyway, this question is very tiring and helpless to answer, such as the first.

I really can't give an answer to a question, so please be blind.

1.Give the landlord two ways to practice. Take an astronomical telescope and look at it in turn

1.Stars in the Sky 2Houses in the distance 3

Lights in the near distance. See at what distance the telescope can image. Or if you put a moonlight filter on the moon when you look at it, will there be any difference between the moon observed?

2.Stellar time is the right ascension of the upper middle celestial body. The Greenwich Observatory at 15:09 stars in the mid-heavens, and the bodies in the mid-heavens at 5:51 in the Earth.

Greenwich time is 15h9m-5h51m earlier than the local time. Now it's a middle school geography problem.

I didn't say the answer, just gave a general idea. Figuring out the question on your own makes a lot more sense than getting the answer from me.

16 meters = 13 kilometers = 5 astronomical units = light years. I would like to know which binary system this question refers to.

Hello, the analysis is as follows:

mv^2/r=gmm/r2

m'*(200)^2/6*10^9=gmm'(6*10 9) 2 two types are erected, so that v=c=3*10 8 can get the size of r, that is, the maximum radius.

Hope it helps! Give a good review, thank you!