Why can t I find black dwarfs in the universe?

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.

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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.

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.

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.

A black dwarf is the product of the continued evolution of a white dwarf of similar solar mass, with its surface temperature dropping and ceasing to emit light. Since the life cycle 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 are black dwarfs in the current universe, it will be extremely difficult to detect them.

Because they have stopped emitting radiation, if any, in very small amounts, and are mostly obscured by cosmic microwave background radiation, the only way to detect them is to use gravity detection, but this method is not very useful for less massive stars. Unlike black dwarfs, where brown dwarfs have too little mass and their gravity is not strong enough to nucleofusion hydrogen atoms, black dwarfs have enough mass to shine in their main-sequence age.

Dwarf knowledge (the following errors are corrected as follows: In fact, brown dwarfs and brown dwarfs are different names for the same type of celestial body, and it is generally agreed that brown dwarfs are more commonly named. This is a celestial body between a giant planet and a star, commonly known as a "failed star", its mass is between 13 and 80 times that of Jupiter, that is, more than 13 times Jupiter and less than times the Sun, at this stage it can shine through the transformation of gravitational potential energy, and can also be triggered.

Simple elemental fusion (and the principle of the hydrogen bomb made by humans) but the energy is extremely low, only greater than times the mass of the sun can ignite hydrogen fusion, and only greater than times the mass of the sun can enter the main sequence star stage and eventually have the ability to collapse into a white dwarf, the white dwarf is the star nucleus left behind after the "fuel" runs out of "fuel" and dies, because of the high temperature, it is called a white dwarf, and the white dwarf gradually cools down and becomes an invisible black dwarf).

Black dwarfs are imaginary celestial bodies, remnants of stellar energy depletion, hundreds of billions of years to come. The age of the universe is 138

100 million years old, which is shorter than the time for stars to evolve into black dwarfs, so there are no black dwarfs in the universe yet.

When the Earth is changed by humans to be black in the rivers and black in the sky, then it can be renamed Black Dwarf.

Do you know what a white dwarf is? Black dwarfs have no one to define what they are, or you can define them!

Black dwarfs should not exist in the universe yet.

Black dwarfs are the final stage in the evolution of low-mass stars, which are objects with a mass roughly the mass of one solar or less. To put it simply, a black dwarf is a cold white dwarf.

White dwarfs are formed at very high temperatures, but because there is no energy for **. As a result, it will gradually release its heat and gradually become cold (lower temperature), which means that its radiation will gradually decrease from the initial high color temperature and turn red over time. Over a long period of time, the temperature of the white dwarf will cool to the point where the luminosity is no longer visible, and it will become a cold black dwarf.

Based on the cooling rate of white dwarfs, white dwarfs, which are slightly less massive than the Sun, take hundreds of billions of years to cool to the cosmic background temperature. Since the current age of the universe is only 13,713.8 billion years, there are no black dwarfs in the universe at present.

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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.