With a radius of 4.5 billion kilometers and a mass of 1000 times that of the earth shield UY, does this star really exist?

According to current observations, the largest star known to mankind is Stephenson 2- 18, with a diameter of 2 158 times and a volume of 1000 billion times that of the sun. Compared with UY, the largest star shield before, Stephenson 2- 18 is twice as large, which once again shows how huge a star can be.

However, whether UY of SHIELD or Stephenson 2- 18, or a larger star that may be discovered in the near future, I am afraid it will be dwarfed by a legendary star. This kind of star even got a name that puzzled its position-quasi-star (note the difference between quasars and quasars, and the relationship between them will be discussed later).

We know that when a massive star enters the end of its evolution, it will end its life in the form of a supernova explosion. When a supernova explodes, its core will collapse. If it is between the Chandraseka limit and Oppenheimer limit, it will collapse into a neutron star. If it exceeds the Oppenheimer limit, it will become a black hole.

When the inner core collapses, the outer shell material will be blown into space, forming a spectacular supernova remnant. For example, the familiar crab nebula, whose shell material began to expand outward in 1054, has now become a magnificent nebula of 1 1*7 light years, and is still expanding until it completely dissipates.

However, for Ban Xing, the situation is different. The mass of this star is so great that the gravity is so strong that even the huge energy released by the supernova explosion is not enough to blow the shell away. But at the core, it collapsed and became a horrible black hole.

In other words, this is a star with the heart of a black hole, so it is also called a black hole star.

Around the core black hole, on the one hand, the black hole is swallowed up by gravity, on the other hand, this horrible swallowing will also release extremely amazing energy. As a result, these two forces have reached a strange equilibrium state, which is somewhat similar to the balance between the internal gravity of ordinary stars and the external energy of nuclear fusion.

For all the stars known today, they can't do this because the mass is not big enough. After calculation, scientists believe that to become such a strange celestial body, its mass must at least reach 1000 times of the sun, or even 10000 times. At present, the heaviest star R 136 a 1 is only about 2 15 times the mass of the sun. As for UY star, its density is actually very, very low, and its mass may be only 10 times that of the sun. In other words, the mass of a star-like star may be 1000 times that of Shield UY!

The quality is so amazing that the volume is naturally not small.

It is speculated that the radius of a star-like object may reach 7000 times that of the sun and more than three times that of Stephenson 2- 18. Calculated, it is about 4.87 billion kilometers! If we put other stars in the position of the sun, then the shield UY can devour Jupiter's orbit, Stephenson 2- 18 can devour Saturn's orbit, and the star-like can even devour all the orbits of the eight planets. Converted down, the size of the star-like can reach hundreds of billions of times that of the sun!

Like the UY shield, the temperature of stars is relatively low. Although the activity of the core is extremely intense, the surface temperature is only 4000 Kelvin, which is almost 2000 Kelvin lower than that of the sun.

There is also a similarity between the two, that is, the life span of Ban Xing is also very short, even shorter than UY. It takes only about 7 million years for a star-like object to disappear completely. During these 7 million years, the core black hole will devour the material equivalent to 0. 14 solar mass every year, which is crazy. Only such radiation pressure can maintain the balance inside the star-like.

So, where are the star-like objects?

Unfortunately, it still exists in theory. Scientists think it is unlikely that we can observe such celestial bodies at present, because they belong to the oldest stars in the universe, the so-called Star Group III.

Star Group III is the first star in the universe. They were formed in the early days of the Big Bang, so there was only hydrogen and helium in them. The life span of the first stars was very short, no matter they were stars or other kinds. Therefore, even today's Hubble Space Telescope can't observe them, and even the upcoming James Webb Space Telescope may not have such observation ability. Its observation ability can reach about 65.438+036 billion light years, but theoretically none of the first stars can live to this time. Therefore, star-like objects will indeed stay at the theoretical level for a long time.

However, it can well explain some strange problems, such as supermassive black holes and quasars.

So far, scientists have observed many supermassive black holes in the distant universe. However, in that early universe, the mass of supermassive black holes far exceeded the theoretical allowable range, which made their existence a difficult problem for scientists.

Some people think that the predecessors of these supermassive objects may be quasars. The black hole at its core is constantly devouring, first devouring its own mass and then devouring the surrounding celestial bodies. The mass of this black hole has also increased from several thousand times that of the sun to several billion times, so it became a supermassive black hole in the early universe.

Around them, a large number of stars will form, thus forming a huge galaxy. In the process of swallowing, these black holes will form huge accretion disks, releasing terrible radiation, which can even exceed the brightness of the whole galaxy. Perhaps this is the essence of quasars.

Supermassive black holes and quasars are the most puzzling astronomical puzzles for scientists all over the world. Perhaps celestial bodies such as stars can explain these puzzles, but everything needs observational evidence. I wonder when we can have a powerful telescope to observe the first stars. These elders in the universe contain too many secrets of the universe and are worth exploring.