Since the big bang 13.8 billion years ago, the rapidly expanding universe has given birth to planets, stars and other celestial bodies, which are not completely isolated and disorderly running. On the contrary, various galaxies of different sizes have been formed in an orderly manner. Countless galaxies have formed our present universe. Each galaxy is equivalent to a small world and small system. There must be a super massive celestial body in the center of this galaxy.
Only when the mass of the center of the galaxy is large enough and the gravity is strong enough, can it firmly bind planets, asteroids and other celestial bodies around it. Like the sun in the center of the solar system, its mass accounts for 98.86% of the total mass of the solar system, so it can produce a strong gravity, let the eight planets around it, thus forming a very stable solar system.
Hundreds of billions of stellar systems like the solar system make up a larger galaxy, the Milky way. The diameter of the Milky way reaches 100000 light-years. In such a wide range, all the stars, except a few stray stars, have to move around the center of the Milky way. The mass of the galactic center must account for the vast majority of the total mass of the galaxy. Only in this way can it rely on strong gravity to make stars within 100000 light-years revolve around it.
The mass of the sun can only affect the range of the solar system, and the range of the solar system, including the Oort nebula, is no more than 2 light-years, but the diameter of the Milky way reaches 100000 light-years, so what is the celestial body at the center of the silver? Scientists think that in the universe can have such a huge mass of possible only supermassive black holes. Therefore, scientists have been speculating that there is a supermassive black hole at the center of the Galactic heart.
Of course, this is only a vague conjecture of scientists. To really understand the mystery of silver heart, more observation data are needed. But the silver center is not a very clean space. On the contrary, there is a lot of dust here, which blocks the observation line of sight of the astronomical telescope. Although we can’t see the true face of the galactic center more clearly, we can see that the position of the galactic center is very bright.
This brightness is very similar to the accretion disk in the horizon of supermassive black hole. I believe that all my friends are unfamiliar with black holes. Its center may be a singularity with infinite mass and infinitesimal volume. So although a black hole is called a black hole, it is basically a celestial body without physical structure. Moreover, the phagocytic ability of black holes is strong, which can devour all things in the universe, even if the light enters the horizon, it can’t escape.
Therefore, the existence of black holes is difficult to be observed directly. But supermassive black holes are not difficult to find, because they are so conspicuous in the universe. Although black holes devour everything, they cannot reflect light. However, supermassive black holes can affect a wide range because of their strong gravity. Under the action of its gravity, nearby stars, planets and other celestial bodies will continue to approach it. Once they enter the event horizon, they will be torn and decomposed by it, and then the black holes will be broken step by step.
In stars and other celestial bodies, the material fragments torn by the black hole will not immediately fall into the black hole, but first form an accretion disk around it. The friction between the materials in the accretion disk will produce huge energy, which is extremely powerful and bright, and can radiate out, so it can be observed by astronomical telescopes. Therefore, the shadow of supermassive black holes is often difficult to hide and easy to be found.
The first black hole picture released by scientists this year is a supermassive black hole 65 million light-years away from the earth. It may be in the process of constantly devouring stars, and the accretion disk appears extremely bright. Although it is 65 million light-years away, we still observed and took the first picture. Maybe many people don’t understand: why don’t we take pictures of the supermassive black hole in the center of the Milky Way galaxy, which is only 25000 light-years away from the earth?
But in fact, the black hole in the center of the galaxy is not very bright now, and it is blocked by a lot of dust, which makes it more difficult to observe. So although it is relatively close to the earth, we know very little about the black hole at the silver center. There should be a supermassive black hole 400 times the mass of the sun at the center of the silver. Scientists named it Sagittarius A *.
This supermassive black hole in the center of the Milky Way galaxy is surrounded by a lot of dust and gas, and their strong scattering effect will seriously affect our observation of Sagittarius A *. For this reason, scientists need super-high resolution telescopes in order to uncover the mystery of Sagittarius A *.
With the current global astronomical telescopes, no single telescope can meet the requirements. Scientists have come up with a very clever solution, that is to gather radio telescopes from all over the world and connect them to form a huge virtual telescope, so that VLBI can be used for observation.
Through this ingenious method of connecting telescopes from all over the world, we have made the preliminary observation of super-high resolution, completed the observation of Sagittarius A *, and the relevant data are being processed and studied. The mysterious supermassive black hole in the center of the Milky Way galaxy has gradually revealed its mystery. Is this really the only supermassive black hole in the galaxy’s center?
Recent observations show that there may be a second “hole” in the center of the Milky way, a mysterious blank area containing only some young stars but no old ones. Previous observations on the center of the Milky way have found dozens of young stars whose bright blue radiation is strong enough to break through the dust that envelops them and the weak light from a large number of older stars It’s obscured by the presence of young stars.
If there is only a black hole in the center of the galaxy, this black hole is enough to bind the stars nearby for billions of years. However, we have not found stars over billions of years old in the center of the galaxy. Instead, we have found many young stars only hundreds of millions of years old. So why is there no older stars in the center of the galaxy? There is only one answer. Besides black holes, there is also a mysterious region.
It is still a mystery what region in the center of the galaxy coexists with the black hole. In order to really study and explore the mystery of the silver center, it may be difficult to achieve long-distance observation only by astronomical telescope. The main reason is that there are a lot of cosmic dust and gas around the silver center, which completely surround the silver center. We can see that the brightness of the silver center is very weak.
If the location of the silver center is not as clean as that of the supermassive black hole 65 million light-years away without a lot of dust and gas, we may know more about the silver center. Therefore, if you want to understand the celestial mystery of the location of the galactic center, you may need close observation. However, the distance of 25000 light years is a hopeless and insurmountable gap for human beings.
Of course, science and technology are constantly developing. What we can’t do now may not be impossible in the future. At present, the speed of light is the limit of the speed of an object, but in the future, it is possible that the speed of light is just the starting speed, and superluminal flight is also possible in the future. Once human beings fly faster than light, it will be no longer difficult to reach the center of the Milky way. At that time, we can observe the mystery of the galactic center at a close distance. What is there, a supermassive black hole or other more mysterious objects? The answer will come out. We are looking forward to that day.
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