Standing on the earth, we think this is a vast and vast world, but when we step out of the earth, we realize that the earth is nothing but a tiny piece of dust in the Milky Way. In front of the universe, the Milky Way is also a dust, which shows how small the earth is.
It is just such a tiny piece of “dust” that lives in more than millions of various kinds of life, and there are also intelligent life human beings. A dust-like earth can give birth to intelligent life, so the vast universe will naturally not lack the existence of extraterrestrial civilization.
After leaving the earth, human beings have been looking for the figure of alien civilization, but more than half a century has passed and there has been no discovery until now. Is there no alien civilization in the universe? Scientists do not recognize this. In our opinion, even a small galaxy should have many living planets and some alien civilizations.
The reason why mankind can’t find alien civilization is mainly due to the limited scientific and technological strength of mankind. Although we can get out of the earth and explore the universe initially, we are still far from truly interstellar. A small solar system has a diameter of 2 light years. At the current speed of human spacecraft, it will take tens of thousands of years to go out.
Only by going out of the solar system and exploring the outer starry sky can we hope to discover alien civilization at close range. To achieve this goal, mankind still needs a long time to develop. Humans cannot go to the interstellar to explore alien civilizations, so they look forward to the alien civilizations coming to the solar system to come into contact with humans. To cross the interstellar to the solar system, at least have the ability to fly at the speed of light, that is, at least a second-level civilization is required to be able to do it, and humans are currently only level 0.7.
When the strength of a civilization reaches the second level, it is already regarded as an interstellar civilization, and in our eyes it is an advanced civilization. The expectations of mankind have not been realized until now. We have not seen an advanced civilization come to the solar system, so many people have a question: Does advanced civilization really exist?
Only advanced civilizations are capable of interstellar navigation and can hope to come to the solar system. Now that advanced civilizations have not appeared, does it mean that they do not exist? In fact, this kind of cognition is relatively subjective and one-sided. Whether it is from the perspective of the vastness of the universe or the age of the universe at 13.8 billion years, the existence of advanced civilizations is also inevitable.
From the perspective of 13.8 billion years of the universe, it is not surprising that civilizations that are tens of thousands, millions, or even hundreds of millions of years more advanced than human beings, on the contrary, the nonexistence makes us feel scared. There will be great differences in the level of science and technology between cosmic civilizations. In 1964, Soviet scientist Nikolai Kardashev divided the strength of cosmic civilization into three levels.
Type I civilization can fully utilize planetary resources, Type II civilization can fully utilize stellar resources, and Type III civilization can fully utilize galaxy resources. Kardashev’s classification of civilization levels is based on energy, and different levels of civilization have different requirements for energy.
Energy is the foundation and core of civilization. With the continuous improvement of civilization’s scientific and technological strength, energy consumption will continue to increase. According to the classification of the Kardashev civilization level, the energy consumption of the second civilization is 10^26W. If this consumption is to be met, it seems that stars can meet this condition in the universe. Therefore, when the strength of a civilization reaches the second-level civilization, it needs to fully utilize the energy of stars.
So how do advanced civilizations fully utilize the energy of stars? Scientist Dyson proposed the Dyson sphere theory, which is a huge man-made structure surrounding a star, which can wrap the star to fully absorb the radiated energy. If a star is wrapped in such a huge man-made structure, the energy of the star cannot be effectively radiated to the universe.
The energy of the star is trapped in a limited range, then we can observe through the astronomical telescope, we will find that the brightness of the star has obvious changes, and even the star will completely disappear, so that we can not see it. So does such a cosmic phenomenon exist? The answer is yes. In the past days, astronomers have successively observed the suspicious phenomenon of abnormal dimming of 21 stars, including the famous “Tabby Star”.
In order to study the strange stellar phenomenon that may exist in the universe, scientists launched the “Vasco” observation project. In 2019, the research team of the project published an article in the Astronomical Journal and pointed out that they compared the current starry sky photos with the past. A very detailed comparison of the records showed that at least 100 stars have disappeared abnormally in the past few decades.
Scientists believe that these abnormally disappearing stars are not that they actually disappeared from space. They may have been wrapped in Dyson spheres by advanced civilizations. The light cannot be scattered, so they disappeared from the field of view of the astronomical telescope. On June 30, 2020, a research paper published in the “Monthly of the Royal Astronomical Society” mentioned this phenomenon again. The article pointed out that using the VLT Sky Survey Telescope of the Palatine Observatory, astronomers discovered another one. The giant star disappeared somehow.
This giant star is about 75 million light-years away from the earth. It is a very dazzling blue variable star. Observation data show that its mass is about 85 to 125 times that of the sun, and its brightness is about 2.5 million times that of the sun. . Such a dazzling star has mysteriously disappeared, which naturally arouses the great attention and interest of scientists.
It is necessary to know that for a massive star, it is difficult to hide itself and disappear under natural conditions. Even if its life span reaches the end, it will trigger a more violent supernova explosion, which will illuminate the entire galaxy and be easier for us to observe. To. Now it disappeared somehow without leaving any traces, which is very strange.
Regarding the mysterious disappearance of this giant star, alien lovers believe that this may be an advanced civilization that has wrapped the star. It is important to know that the larger the mass of the star, the greater the energy it radiates. Advanced civilizations have a great demand for energy, and naturally they will not let go of such massive stars around them, especially when supernovae explode, the energy is even more powerful.
Advanced civilization may discover that this giant star is about to have a supernova explosion. In order to collect huge energy, it will be wrapped up. Of course, this is just a speculation of alien lovers. Scientists will not easily conclude that there is an advanced civilization here. They just put forward two hypotheses about this.
The first hypothesis: Because the mass of this giant star is very large, and the core fusion reaction zone is relatively small, under the pressure of its own gravity, it may skip the process of supernova explosion and directly collapse into a black hole. Whether this false height is correct or not is currently unanswered. In theory, even if a supermassive star is to evolve into a black hole, there is a high probability that it will experience a supernova explosion.
The second hypothesis: This massive star may have been in an explosion state for a long time, but this explosion is not a supernova explosion, but the loss of the stellar shell material caused by the huge radiation pressure inside the star. This material loss has no obvious energy burst, and over time, it evolves into a star with lower brightness. Due to the very long distance, it is naturally impossible to see with the current human observing ability.
In any case, the disappearance of stars inexplicably is a direction for us to explore and find alien civilization. Before mankind has realized the technology of interstellar navigation, we can only find traces of alien civilization through astronomical telescopes. One is to search for signals of possible alien civilization, and the other is to observe abnormal stellar phenomena.