Curiosity is a major implanted genetic code that everyone has, and everyone has an unknown world that they like to explore. The exploration of space and the revelation of extraterrestrial civilizations have always attracted humans to explore the depths of the universe.

It only took humans 5,000 years to embark on the path of scientific development. It must be admitted that this is a miracle, and it is the result of human wisdom and hard work.

Science and technology guide mankind towards the new century, making human civilization leap forward again and again. It not only makes people's quality of life higher and higher, but also realizes people's dream of flying in ancient times and exploring from the earth. The vast starry sky.

With the power of technology, our grand ambitions reach the stars and the sea. People hope that one day we can become the masters of the galaxy and the universe.

Facing the vast universe, we must think about a question: the possibility of alien civilization. In the vast universe and the 13.8 billion-year development history of the universe, we cannot deny the existence of extraterrestrial civilizations.

Through a large number of observations, scientists believe that alien civilization exists and the universe should be full of vitality. Only by understanding more about extraterrestrial civilizations can future generations more successfully dominate the starry sky.

Although our imagination is vivid, the universe we see is full of loneliness and little excitement.

Scientists have long calculated whether there are more humans inhabiting the universe than we know. There must be many alien civilizations in the universe, but why can’t we see them?

To this day, scientists still do not believe that there are no alien civilizations in the universe. The reason why we cannot find them is that our observation methods and capabilities are limited. Therefore, half a century ago, scientists began a great plan to explore extraterrestrial civilizations. The project uses a variety of methods to search for extraterrestrial civilizations, such as Voyager 1 and Voyager 2.

Both spacecraft carry a golden disc that records the coordinates of the earth and human information. The Voyager spacecraft has been advancing outside the solar system, hoping to be discovered by alien civilizations after leaving the solar system, thereby understanding the existence of the earth and humans, and coming to the solar system to contact us.

In addition to launching interstellar spacecraft, scientists are also looking for signals that there may be alien civilizations in the universe. If alien civilization enters the technological age and steps out of the universe like humans, then the popularization of radio communications will be inevitable.

Radio signals already travel at the speed of light. If a powerful extraterrestrial civilization also discovers the Earth, it may actively send a signal to the Earth.

By looking for these signals, we can prove the existence of alien civilizations by deciphering them, and determine each other's locations based on the source of the signals. Unfortunately, no traces of life have been found until now.

In addition to the above two methods, there is another way to explore civilizations other than the Earth, which is to use astronomical telescopes to search for Earth-like planets in the Milky Way. Scientific research shows that the earth can become a planet of life and nurture human beings. This is related to its high-quality natural ecological environment. And every high-quality ecological planet is easy to see as long as you stand in space.

There are eight planets in the solar system. Comparing them together, we will find that the earth is shining with the light of sapphire. It is a unique planet with life, so other civilized planets in the universe also have the same beautiful and dazzling appearance.

There is no doubt that life and even intelligent civilization may exist on terrestrial planets similar to the earth. NASA launched the Kepler mission on March 7, 2009. It's a very powerful telescope that can do very broad searches and it can look for planets.

The Kepler mission uses the Midheaven method to search for planets. In short, it uses the light changes produced when stars and planets overlap to determine whether there are planets near the star. Through this method, the size, shape, distance, revolution and other information of the planet can be preliminarily determined.

During the 9 years of its operation, Kepler observed thousands of star systems and discovered many planets, including hundreds of habitable Earth-like ones. It can be seen that the same is true for planets similar to the Earth in the universe. Some Earth-like planets are very similar to Earth, but also very beautiful in appearance. Scientists speculate that they may be the Earth.

What scientists are most looking forward to is of course the discovery of extraterrestrial civilizations, but by observing and searching for terrestrial planets, we cannot determine whether intelligent civilizations exist in galaxies or terrestrial planets.

A great discovery has reignited the hopes of scientists who had not expected to find alien civilizations this way.

In order to search for planets, the Kepler telescope discovered a special star called the Forbidden Star in the constellation Cygnus, 1,500 light-years away from us. As mentioned before, Kepler looked for stars by changing their brightness. Generally speaking, even if there are dozens of planets clustered around a star, their luminosity will not fluctuate by more than 5%.

But the "Tabby Star" appeared several times in strange shapes, and its luminosity changed drastically. The most severe one even turned 22% darker. This has never happened to other celebrities. What's going on here? When this was first discovered, some scientists thought it might be due to cosmic dust clogging the star.

But this conclusion was quickly rejected. If cosmic dust covers the light emitted by the Tabby Star, then the cosmic dust will definitely heat up in the process of being illuminated by the Tabby Star's light, and it will be easily visible in infrared observation instruments, but it does not actually exist.

If these natural phenomena in the universe cannot greatly reduce the starlight, there may be only one result, and that is the inference of the Dyson sphere. Freeman Dyson was a famous physicist who proposed the "Dyson sphere" conjecture. When civilization developed into the second stage, he believed that due to the need for a large amount of energy, it was necessary to make full use of the huge energy of stars. To fully utilize the energy of a star, a huge structure must be built to surround the star and absorb the energy.

If a star is surrounded by a huge device like a Dyson sphere, the brightness of the star will naturally be greatly changed. It is this abnormal brightness change that occurs in spotted cats. Scientists speculate that there may be a secondary civilization appearing in the constellation Cygnus, 1,500 light-years away from the earth.

If there is a second-level civilization in the forbidden galaxy, will it be a blessing or a worry for mankind? On a cosmic scale, a distance of 1,500 light-years is actually a very short distance. Currently, humans cannot cross it because our civilization level is only level 0.7, which is not even a level. But for the second-level civilization, we have already mastered the technology of interstellar navigation. If you have not mastered the technology of super-light speed flight, basic sub-light speed flight can be achieved.

Using sub-light flight technology, it can be 1,500 light years away from us and can be achieved for thousands of years. Perhaps thousands of years is a long time for human beings' short life, but we must not forget that the power of technology is endless. People's continuous exploration of genetic technology and efforts to extend life have achieved some results.

Then the second civilization naturally has more powerful life technology, and it is not surprising that the life span increases to thousands of years. With the powerful technological power of the Second Civilization and a distance of 1,500 light years, they may have discovered the Earth. Some people also speculate that the earth may be an intelligent and civilized planet.

If the "Dark Forest" law exists in the universe, it is that humans have made a sound in the forest, and other hunters are also advancing towards us. Perhaps in the not-too-distant future, Bambi's spacecraft will reach the solar system. Are alien civilizations coming to the solar system to be idle? Of course not, it must have its purpose, is it for the resources on the earth or for human beings? Are alien civilizations friendly to humans or evil?

So Hawking has repeatedly warned humans not to search for alien civilizations, because it is actually very unwise to actively expose the existence of humans before humans are truly powerful, and will bring devastating crises to the earth and humans. .

Some people may doubt that civilizations cannot coexist peacefully? This involves another theory "entropy is irreversible". If the resource energy reaches the end, it will be gone, so it can only be cleaned up but not saved.

For those who like the world of science fiction, this series of books "The Three-Body Problem" is very suitable to read. There are too many theories related to physical phenomena in the book. Although it is science fiction, it does not hinder some of his reasonable speculations. There are too many thoughts about human nature in the book, all of which are expressed vividly in a novel that everyone can understand.

If you are fascinated by the world of science fiction, want to expand your worldview and philosophy, want to know more about human beings, and think about the future, I strongly recommend "The Three-Body Problem".

There are three parts of "The Three-Body Problem" in one book, "Once Upon a Time on Earth", "Dark Forest", and "The Immortality of Death". The author loves the second and third parts the most. I was so excited when I first read them. Can't stop. Even when I go to bed at night, my mind is filled with the majestic and ethereal universe, novel science fiction concepts, and ingenious story ideas.

For "The Three-Body Problem", Liu Cixin won the Hugo Award for Best Novel at the 73rd World Science Fiction Convention, the first time in Asia to win this award.

Obama also changed his mind because he wanted to watch the sequel. Thinking about a former president, such a calm person could not resist his charm. How many books can do this? In addition, among the die-hard fans of "Three-Body" are not only Lei Jun, but also Jack Ma and Ma Huateng.

When I first came into contact with "The Three-Body Problem", I was immediately attracted by the compact plot and the author's extraordinary imagination. The "Dark Forest Law" and "Dimensionality Reduction" appeared in the book. "Blow" and other contents completely subverted my understanding of the universe and this world.

"The Three-Body Problem" Liu Cixin caused a sensation around the world and became the first Asian writer to win the Hugo Award for his work. In addition, as of April 2020, it has been included in the designated mid-section literary reading list in the Reading Guide Catalog for Primary and Secondary Students of the Ministry of Education’s Basic Education Textbook Development Center (2020 Edition).

Afraid you can’t understand? There is no need to worry about "science fiction" as it can definitely be understood by the literature reading titles designated in the middle section of the Reading Guide for Primary and Secondary School Students by the Basic Education Textbook Development Center (2020 Edition).

The Chinese New Year is coming soon. When giving gifts to yourself or your children, relatives and friends, it is strongly recommended to give this set of science fiction feasts. Knowledge is not expensive, it is only the cost of a meal. What are you waiting for? Click to buy it immediately and take it home.