"Extraterrestrial life definitely exists, the Earth is too small, the universe is too big. How can we be alone? Chen Mengchuan smiled and said to Crooks, Thomson and Langmuir.

A group of people were resting on the couches in the small reception room, and the news of the arrival of the Year Star Edge One in Europa had arrived.

Scientists at the level of Carl Sagan and Stephen Hawking believe that the observable universe is so large that it is undesirable to say that there is no life anywhere else than Earth. There is much controversial evidence that extraterrestrial life exists.

Crookes and the others are also more inclined to the existence of extraterrestrial life.

"In my opinion, in fact, extraterrestrial life may arise independently in many parts of the universe, or it may produce life in one place and then spread to other habitable planets."

"These two assumptions are not necessarily mutually exclusive, but from the point of view of scale and probability, the earth, as a habitable zone, has all the conditions for the survival and evolution of species of life, and in fact, from the beginning of the Phanerozoic in the history of the earth to the present, in the more than 500 million years and millions of biological species, only one species has successfully evolved into higher intelligent life, and that is our human beings, not a variety of diverse higher intelligent beings coexisting on the earth, which shows that under the same conditions, Higher intelligent life does not come into existence so easily. Chen Mengchuan expressed his opinion.

The alien civilization he saw in his dream made Chen Mengchuan very clear.

"Haha, Boss Chen, then how do you explain the Fermi paradox?" Crookes asked him with a smile.

Chen Mengchuan was silent for a while, and then slowly spoke: "I think alien civilizations exist, but... Under the different levels of civilization, plus the spatial scale of the universe......"

The time distance between civilizations is too far to be easily contacted. Proxima Centauri α Proxima Centauri, the closest star to the solar system, is also 4.22 light-years away, which means that even if the galaxy is equally willing and capable of discovering and searching for our intelligent life, it will take them a considerable amount of time to reach Earth, and this time, most likely, has already surpassed the lifespan of the species itself.

On the other hand, the time for human beings to rush out of the earth is only a few decades ago, compared with billions of years since the birth of the earth, the proportion is really very short, even less than 1 in 100 million, and the probability of being able to be observed by extraterrestrial life is very low, and this also needs a premise, that is, the other party also needs to have the ability to continue to observe, otherwise the probability of being able to be observed by chance will be squared again.

The probability that the other party will observe and give a signal that can be accepted by us is lower; Again, the signals transmitted by both sides must be large enough to be traceable in light-year interstellar space without flooding.

Dozens of Tianzhi Technology has now preliminarily mastered the space shuttle technology, but it is still far from the speed of light. Even if Tianzhi Technology reaches the speed of light at the technological level, it will take years of non-stop flight to get to the nearest star system.

Several people exchanged and discussed the topic of extraterrestrial civilization, why do they all think that extraterrestrial life exists, but humans have not been able to discover it?

After Chen Mengchuan said that the reasons were from the order of magnitude, Thomson and Langmuir extended many views.

Thomson thinks it may be that life has been difficult to expand from one part of the galaxy to another, so it hasn't reached Earth yet.

Langmuir is more pragmatic, he said that he put forward a very objective situation, that is, the time for human beings to really search for aliens is too short, in the end, it is less than a hundred years.

"Maybe the alien civilization has discovered human beings, but the signal sent back has not yet reached the earth, after all, the transmission of the signal also needs enough time."

"Earthlings are unaware that the signal sent back is a product of an extraterrestrial civilization. Or maybe the signals sent by the earthlings inadvertently destroyed the alien civilization. Anything is possible, isn't it? BOSS CHAN. Crookes said with a smile.

Chen Mengchuan smiled, his expression looking relatively calm.

"BOSS Chen, won't you summarize it for us?" Thomson refilled Chen Mengchuan's teacup with some black tea.

"Summary? Haha, thank you, Thomson. Chen Mengchuan took the teacup and thanked him.

"In fact, in addition to the quantitative reasons, I think there are three more possibilities."

"One is that due to technology, there are many civilizations whose technology may never be able to effectively transcend galaxies, and even if they have a certain amount of technology, this technology is still not enough to achieve transcendence of galaxies, and exploring life is a very unimaginable and huge subject. From the perspective of our human civilization, it may also be that the method of human beings looking for extraterrestrial life is incorrect, so we have not seen it yet. ”

"The time for which civilizations broadcast radio signals to the outside world is very short, especially because most technological civilizations have been around for a very short time and cannot leave their home galaxy, resulting in the density of technological civilizations and the radio broadcast density of these civilizations being too low, and the signals are too weak to detect or some of the broadcast signals that once existed in the solar system before humans began to detect the signals no longer exist in the solar system because of the short broadcast time. That means we're constantly missing out."

Or the term "technological singularity", technological civilization generally passes through technological singularity. Since then, it is either impossible or meaningless to interact with humans who have not yet passed through the singularity. For example, will we go and try to communicate with the floaters? Obviously, it's very difficult, because it's no longer on a level anymore. ”

"There is also a technical reason, which is that it may be that extraterrestrial technological phenomena are too close to natural phenomena to be distinguished, so we have not been able to crack them."

After Chen Mengchuan said this, he paused and took a sip of black tea.

"What do you think of the Dark Forest hypothesis? BOSS CHAN. Could it be that the resources available for civilization to survive in the universe are limited, and it is difficult for different civilizations to communicate effectively to show goodwill due to distance limitations, so more developed civilizations tend to destroy less developed civilizations that may compete with them for resources, and less developed civilizations tend to hide their existence to avoid attack. Based on this, some of the faint signals sent by us humans are deliberately ignored? Thomson asked him.

Before he finished his question, Langmuir also added: "Yes, the dark forest hypothesis, and the zoo hypothesis, perhaps the alien civilization has far surpassed the human civilization, in order to observe the natural behavior of human beings, deliberately do not come into direct contact." It's also possible. ”

"Ha, maybe extraterrestrial life isn't interested in answering me, just like receiving the wrong call from someone else when I'm emotionally upset."

Chen Mengchuan nodded: "What you said is all possible, or maybe they have already come into contact with humans, but they exist in a higher dimension that humans can't detect, or they deliberately hide the evidence of contact." Of course, it may also be that aliens only make contact with suitable humans, although there is no intention of hiding evidence, but there is no intention to publicize it widely, to put it up, it is a sentence, everything is possible. ”

"Hahaha......" Everyone laughed, and the atmosphere on the scene was very good.

Under Chen Mengchuan's smile, there was some faint worry. His eyes wandered slightly, and he pulled out a cigarette from the box on the table, lit it, and took a deep breath.

Could the alien civilization in the dream be caused by the disaster caused by the continuous release of various radio waves and signals into outer space in the early years by human beings in an attempt to find aliens?

The coldness and cruelty of the alien civilization may only be the truest portrayal of natural selection, and the release of the message of human destruction has finally reaped a ruin.

At that time, human civilization had made the greatest resistance, but these resistances were meaningless, and the killing spread all over the earth almost instantly, and the human beings on the entire earth were constantly annihilated, and in just 9 hours, the human race was completely emptied.

Chen Mengchuan exhaled the cigarette in his mouth, and his gaze slowly became resolute.