What is the reason for the extremely low probability of black dwarfs in the universe?

The formation of black dwarfs is very long due to various factors, so it is extremely difficult for black dwarfs to appear in the universe.

The reason why it is extremely difficult to have black dwarfs in the universe is because of the collision of some planets, and some very serious natural phenomena occurred at that time.

Neutron stars and white dwarfs take a very long time to form black dwarfs, which is the main reason why black dwarfs are extremely difficult to appear in the universe.

Because black dwarfs are the remnants of imaginary stars, there are many different kinds of celestial bodies in the universe, so it is difficult to appear.

Scientists believeBlack dwarfIt exists, but it's not yet at the moment of its birth.

Some stars develop into white dwarfs at the end of their lives.

For example, the sun. The Sun is becoming a red giant.

After that, it gradually loses some of its material, then cools and shrinks into a dense white dwarf.

After the Sun becomes a white dwarf, its internal reactions will be converted from hydrogen fusion to helium fusion, which will continue to produce heat. But as we experience in everyday life, there will always be a day when the fuel will run out. Therefore, scientists believe that the white dwarf's internal fuel will one day run out, and then the white dwarf will cool down and become a black and cold star.

Characteristics of black dwarfs:Since the lifetime of a star from formation to evolution into a black dwarf is longer than the age of the present universe, there are no black dwarfs in the present universe. If there were black dwarfs in the universe today, it would be extremely difficult to detect them.

Because they have stopped emitting radiation, if any, it is very small, and most of them are radiated by the cosmic microwave background.

Covered.

Yes.

There are purple dwarfs in the universe. Scientists have reportedly discovered a planet with a slightly purple surface, but it is not clear why it is purple, which may be related to the light of red dwarfs. It's a bit far away from the star Thanyer, so the temperature is as low as -93, and the atmosphere is mostly made up of nitrogen.

Features of dwarf planets:

It is composed of some low-melting compounds composed of frozen water and gaseous elements on the outer mantle and surface, and some of them are mixed with some rocky minerals composed of heavy element compounds, and the thickness of the astrological radius is relatively large.

Dwarf Planet Profile:

The weakest type of galaxy has an absolute magnitude m of -8 -16. Some dwarf galaxies are elliptical galaxies, while others are type I irregular galaxies. Both of these dwarf galaxies are small and usually do not have many member stars.

The mass is only 106 109 solar masses. Irregular dwarf galaxies contain large amounts of neutral hydrogen and contain stars of star group I. Elliptical dwarf galaxies are galaxies with the lowest mass among elliptical galaxies.

They are similar to globular clusters, except that they are about 10 times larger in diameter. Of the 40 galaxies in this galaxy group, more than 20 are elliptical dwarf galaxies, which shows the sheer number of galaxies. This galaxy is weak in luminosity, so it is not visible beyond the 49,999 parsec.

Originally, it referred to stars with weak luminosity, but now it refers to stars with luminosity of V in the spectral classification of stars, that is, they are equivalent to main-sequence stars. Dwarfs with spectral types O, B, and A are called blue dwarfs (e.g., Vega.

1. Sirius), dwarf stars with spectral type F and G are called yellow dwarfs (such as the Sun), and dwarf stars with spectral type K and later are called red dwarfs (such as South Gate 2B star). But white dwarfs, subdwarfs, and "black dwarfs" refer to something else, not dwarfs. A class of low-luminosity stars whose matter is in a degenerate state is also not a dwarf star.

Because our technology is very limited, it is not that we can do what we can think of, but that we can determine whether we can find what we need by our own technological development. As far as I've learned, the black dwarf.

Many people are not very familiar with these three words, including me, who is also a talent, because these materials are all learned from the inaccurate ** chain, and they are familiar with the late stage of the evolution of small and medium-mass stars.

And it's a white dwarf.

or smaller neutron stars are the product of continuous aging evolution similar in magnitude to the mass of the Sun. It is actually composed of low-temperature degenerate electronic gases, and its surface temperature is relatively low, so it stops emitting light and heating. Since their entire star is at its lowest energy, they can no longer produce energy radiation.

Black dwarfs are theoretically a type of object that is estimated to exist because it is in a cold degenerate state and no longer emits radiant energy. Due to the life cycle of stars from formation to evolution to black dwarfs.

It has a longer life cycle than the current universe, so there are no black dwarfs in the current universe. If there are black dwarfs in the current universe, it will be difficult to detect them. Because they have stopped emitting radiation, and even if there is, it is very small, and most of them are radiated by the cosmic microwave background.

Cover. <>

So the only way we can detect it is really by using gravity detection. Black dwarfs are no strangers to physics, do not regard the words black dwarfs as new objects other than white dwarfs and neutron stars, white dwarfs are actually cooled down and become black dwarfs, they are no different from white dwarfs in composition, structure and state. It's like cold soup or soup, so a black dwarf after a white dwarf cools down is essentially a white dwarf.

Finally, about the above questions, I personally have answered them here today, if you have other ideas or other questions, you can comment or discuss below.

Astronomers observe the universe generally through astronomical telescopes to observe the light emitted by various celestial bodies, even if black dwarfs exist, there is a high probability that they cannot be seen through astronomical telescopes, and the brightness is too low.

Because there is no black dwarf in the universe, this planet was imagined and named by the author in science fiction, so there is no universe in real life, so it cannot be found.

Many people should have heard of the black dwarf, it is the last stage of the main sequence star, and if our sun continues to evolve, it may become a black dwarf in the distant future, a kind of death star that does not emit light or heat! In this regard, some people are curious: will black dwarfs disappear?

Let's explore with me.

The Sun has a lifespan, and when it dies, it becomes a white dwarf, and after a long evolution, it becomes a black dwarf, which is a death star that does not emit light and heat. As for black dwarfs disappearing? According to the universe.

The evolution of the celestial bodies in the world, theoretically black dwarfs have a lifespan, that is, black dwarfs will disappear. However, the decay of white dwarfs into black dwarfs takes at least 20 billion years to transform into black dwarfs, and the universe.

The age is only 13.7 billion years old, so there are no black dwarfs in the universe at present!

1. The Sun becomes a black dwarf

Earlier we introduced the main sequence star phases: gas cloud protostar main sequence (such as the Sun) Red giant white dwarf black dwarf, that is to say, the sun will slowly evolve into a black dwarf over a long period of time, the specific process is as follows:

The Sun (a low-mass star) expands into a red giant after a long main sequence phase; The red giant continues to expand, and eventually the outer hydrogen burns away, leaving behind a squeezed dense core white dwarf; White dwarfs do not have internal nuclear reactions, and they emit light by the gravitational pull of internal extrusion, and eventually cool down to form black dwarfs.

2. The probability of the occurrence of black dwarfs

White dwarfs are formed when stars lose a lot of mass through supernova explosions, and their mass increases after the formation of white dwarfs. When a white dwarf absorbs matter, reaching more than twice the mass of the Sun, it becomes a neutron star; When a neutron star absorbs 3 times the mass of the Sun, it evolves into a black hole!

At present, the universe we are in is still expanding, but it is still very rich in matter, so the scale and speed of the expansion of the universe are not enough to effectively prevent celestial bodies such as white dwarfs or neutron stars from absorbing matter, that is, white dwarfs can continue to absorb matter, what does this mean? It means that the probability of a white dwarf star decaying into a black dwarf is very small, so the probability of a black dwarf in the universe is very low!

SummaryIn short, the universe is full of unknowns, it is also full of all possibilities, in the future, black dwarfs will appear, theoretically it has a lifespan, will slowly disappear, but there may also be another situation: if the physical laws of the universe do not change, then black dwarfs will exist forever, and all this is waiting for human beings to explore.