There are various “holes” in the universe. They are more mysterious than each other. Which holes do you know?

13.8 billion years ago, a singularity with infinitely large mass and infinitely small volume exploded, and the universe was born. Since its birth, the universe has been expanding outward at superluminal speed. At the same time, all kinds of celestial bodies, nebulae and other materials are constantly forming,

The universe is vast and vast. At the same time, there are many mysterious celestial bodies and mysterious cosmic phenomena. However, there are various “holes” in the universe. They are more mysterious one by one. So which holes do you know? Today, Xiaobian will lead friends to understand these mysterious holes in the universe, so that they can have an eye opening to the mystery of the universe again.

For all kinds of holes in the universe, we should know the most about black holes, which are also the most massive objects in the universe. Black holes are similar to stars, neutron stars and other objects with obvious entities. Black holes seem to be objects without entities. Their mass is concentrated in the singularity at the center. It’s right. This singularity is similar to that of the big bang.

It is the super huge mass singularity at the center that makes the black hole have super strong gravity and gives birth to the technology of phagocytosis. Black holes grow up by swallowing matter. They swallow everything from stars to photons. As long as they are close to matter, they will be devoured mercilessly. Although the phagocytic characteristics of black holes make it impossible for us to directly observe its existence, the supermassive black holes can not hide themselves because they form a large-scale accretion disk in the process of phagocytizing matter.

The matter in the accretion disk is placed around the center of the black hole. At the same time, the friction of these materials produces huge heat and radiation, which is particularly eye-catching in the universe. Even tens of millions of light-years apart, they can be observed by astronomical telescopes. So, like the supermassive black hole at the center of the galaxy, it can be observed.

The first real black hole photo taken by humans is a supermassive black hole 65 million light-years away from the earth. What a black hole is is still a mystery.

Black holes correspond to white holes. Black holes have been confirmed by human beings, while white holes are still in theory. We haven’t found any white holes in the universe, and whether they exist is unknown.

The attribute of white hole is just opposite to that of black hole. Black hole is just like the “black hole” in the universe. It only eats but does not spit, and no one knows where the material swallowed by it goes. Some scientists believe that the matter swallowed by the black hole can not disappear without any reason, they may also be spit out through another kind of hole, and this kind of hole is the white hole. Its characteristic is a celestial body constantly spitting out matter, and the white hole is the other side of the black hole.

Between black hole and white hole, Hawking once proposed another hole gray hole. In a paper published online on January 24, 2014, Hawking said that there may not be black holes in the universe, but gray holes. Gray holes are similar to black holes, but they are essentially different. Hawking once put forward Hawking radiation theory, that black holes will also release energy, not just eat out. Of course, this gray hole is just a kind of hole proposed by Hawking to figuratively compare his new understanding of black holes, so few people know about it.

If you want to ask friends, besides black holes, what is the hole you most desire? I believe many friends will say wormhole. Yes, wormholes are far more important than black holes in a sense. Wormhole is a kind of hole proposed by modern scientific theory. It is more like a tunnel through time and space. Of course, time travel through wormholes, going back to the past or crossing into different worlds are more science fiction plots.

In reality, people’s more understanding of wormhole is actually a door connecting the two spatial positions of the universe. Through this door, we may instantly arrive at Andromeda galaxy from the Milky way, or other galaxies or cosmic space. The proposal of wormhole has given hope to many people who have been desperate to explore the universe.

We all know that the basic distance unit of the universe is light years, and the speed of light is the basic unit of cosmic speed. The universe is vast and vast. No one knows how big the universe is now. However, with the observable range of tens of billions of light-years, it will take at least tens of billions of years for us to complete our exploration at the speed of light.

Even if the galaxy is only 100000 light-years in diameter, it will take at least 100000 years to travel at the speed of light. Even if we can achieve the initial superluminal flight, we may not be able to detect the tens of billions of light-years, let alone the tens of billions of light-years which is only the observable range that can be achieved by human science and technology. The real universe may be thousands of times, tens of thousands, or even millions of times larger than tens of billions of light-years.

In this case, can humans really explore the universe? Human beings may need to increase the speed of the spacecraft to tens of thousands of times the speed of light, hundreds of thousands of times more than the speed of light to realize the preliminary exploration of the universe, but how long does it take for human beings to achieve such a speed, hundreds of millions of years, billions of years or tens of billions of years?

When human beings feel desperate, wormholes appear. If wormholes really exist in space, then we can quickly reach every corner of the universe by constantly shuttling through wormholes.

With that wormhole, let’s talk about the next hole. As we all know, the universe is full of all kinds of celestial bodies, and the distance between celestial bodies is relatively far away, from a few light years to thousands of light years. The distance between galaxies ranges from tens of thousands of light-years to tens of millions of light-years. Although the distance between celestial bodies is very far, they are not empty.

However, when scientists explore the universe, they find that there are many regions in the universe, which are in a state of high vacuum. The vacuum in these areas is far more than what we usually call a vacuum. There is not only no air, no celestial bodies, and even no dark matter in every corner of the universe can be detected. Even the temperature of cosmic microwave background radiation is lower than that in other regions of the universe.

Scientists believe that 85% of the universe may be empty, and their total mass is only about 20% of the universe. According to scientists’ guess, these holes are where the low-density universe lies. Scientists are still exploring the secret of how holes are formed and whether they are really so empty.

There is also a huge hole in the cavity mode, which is actually a hole, just a very huge hole. One of the most famous giant holes is a giant hole with a diameter of 100 million light years in the Perseus supercluster. In 1981, scientists discovered the largest cave in the universe so far, the giant cave in the constellation herpetus, with a diameter of 300 million light-years.

There are many such huge holes in the observable universe, so it is still a mystery why such huge holes formed in the universe. Many scientists see holes and think of black holes. A characteristic of black holes is phagocytosis. If there is a black hole somewhere in the universe, the black hole will continue to phagocytize the surrounding material, and this area will form the equivalent of a hole.

However, the hole in the universe seems to have been dug out of the cosmic film by people’s force. If the hole is left after the black hole devours the matter, where does the black hole go? According to the latest research on black holes, black holes are not immortal. Their energy source is constantly eating material. If there is no material around the black hole for them to eat, the black hole will gradually weaken and finally disappear, and then a hole will be formed in this place.

Of course, this is only a guess of the current home, what is the real reason, still need scientists to explore and study. These are all kinds of holes in the universe. Are these holes more mysterious than each other? If you know the existence of other types of holes in the universe, you are welcome to leave a message below.

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