There may be an alien civilization! 4.2 light-years away from humans, civilization is more than 60 years behind humans

There is no end to the exploration of space. In the universe, besides humans, are there any other alien intelligent creatures? There is no answer to this question for the time being. If there are aliens in the universe, or if human beings come into contact with aliens, it will prove that there is still a home suitable for life in the universe. The lifespan of the earth is nearly five billion years, and the sun will also be near It will end in five billion years. Although this time span seems to be far away for now, it also means a serious problem. If human beings do not find another suitable place to live in the universe, human civilization will one day disappear. To disappear without a trace.

But unfortunately, for now, although there have been many legends of aliens, ufo alien spaceships, etc., there is still no definite evidence to prove the existence of aliens, that is to say, humans have not yet found Aliens, but is there a place in the universe suitable for life? The vastness of the universe is unimaginable, and probabilistically, the answer to this question is optimistic.

Speaking of which, I have to mention a scientific paradox about aliens and interstellar travel-the Fermi Paradox. The Fermi Paradox is mainly based on two speculations. One affirms the existence of extraterrestrial intelligent life. It is believed that there are 250 billion stars in the Milky Way alone, and the stars and the planets around them need to be as subtle as the sun and the earth. Although it is unlikely, when the base number is 250 billion, then extraterrestrial life can exist. From the perspective of the age of the universe, it is not impossible for extraterrestrial intelligent life to evolve.

Another point of view of the Fermi paradox denies the existence of extraterrestrial intelligent life, and believes that human beings have not found any clues of extraterrestrial intelligent life. For the second point of view, there are also three hypotheses: 1. Extraterrestrial intelligent life exists, but they have not yet reached interstellar travel. 2. Although alien intelligent life has discovered human civilization, it is not willing to deal with human beings. 3. Alien intelligent life is actually lurking in the earth, but human beings do not know it for the time being.

The Fermi Paradox was proposed in 1951. Enrique Fermi, a famous Italian physicist who won the Nobel Prize, raised a question "Where are they all?" in a discussion about aliens and flying saucers. This The problem, in turn, leads to the Fermi Paradox. The Fermi Paradox is an open topic. Conjectures about the Fermi Paradox are endless, especially in the science fiction world. Among them, Liu Cixin once proposed the "Dark Forest" rule in "The Three-Body Problem". "Forest" law is one of the conjectures about Fermi's paradox.

In addition to the Fermi paradox, it is also necessary to understand cosmic civilization. According to Kardashev's division, cosmic civilization is roughly divided into planets, stars and galaxy civilizations. Of course, there are other ways of dividing cosmic civilizations, but on the whole, the cosmic civilizations on Earth are still relatively low-level.

For now, many people speculate that if intelligent life ever appeared, then the distance between them and the earth would not be too far. The distance, the distance is 4.2 light-years. The most commonly mentioned Proxima Centauri is Alpha Centauri.

In the constellation Centaurus, there is a Proxima b, which is located in the "habitable zone" of the star to which it belongs, and is likely to have life, and the star to which Proxima b belongs is a red dwarf star, very young, and has a long lifespan. Extremely long, reaching 3 trillion years, while the life of the sun is 10 billion years.

Interestingly, in 2019, the Parkes Observatory in Australia received a signal from Proxima b, and this signal was not produced by nature, so this strange signal is considered to be in Proxima b. The detection signal generated by the intelligent life of the planet, the frequency of this signal is 982 MHz, which belongs to the narrowband, and as early as 1957, human beings sent a narrowband signal to the aliens, that is to say, even if there is intelligent life in Proxima b, Then its level of civilization may not be high, 62 years behind human beings.

Interestingly, in 1974, humans sent a signal of 1420 MHz to outer space, and in 1977, a signal of 1420 MHz and 72 seconds was transmitted from the constellation Sagittarius. This signal is famous- Wow signal

"The Three-Body Problem" uses imagination to present people with a wonderful world of time and space. Of course, some people think that "The Three-Body Problem" is not just a science fiction novel. To a certain extent, "The Three-Body Problem" still has its practical significance.

The book "Three-Body Problem" attracts me most because of Liu Cixin's extraordinary imagination. Many conjectures in the book, even if they are imagined, have a basis. They are science fiction but not all science fiction. Many assumptions can subvert the right knowledge of the universe.

As we all know, "The Three-Body Problem" consists of three books, each of which is worth exploring. The book is not only about science fiction and the universe, but also about thinking and reflection on human nature. Different from ordinary science fiction, "The Three-Body Problem" The span of time in " is unimaginable.

I believe "Three-Body Problem" can shock you. It's just a rare science fiction novel. It can be said to be a milestone-like creation. Readers who haven't seen it can take a look.