I believe many friends have participated in the discussion of alien civilization. We can often see a lot of research and exploration topics about aliens and alien civilizations on the Internet. Human beings are intelligent beings and have formed human civilization, so each of us is very curious, what do other intelligent beings in the universe look like? What is their civilized form?
Some people may say, is there must be an alien civilization in this universe? Is it possible that there is only one civilization of humans? For the universe, there is only one civilization, humans. Some scientists once proposed conjectures, but few people agree with it.
If mankind did not leave the earth, many people might think that there is only one civilization of mankind in the universe. But after human beings walked out of the earth and saw the vast universe, very few people had this idea, and in the eyes of astronomers, the existence of alien civilization is basically beyond doubt.
The reason why scientists have such a cognition is mainly based on a huge base that cannot be counted in the universe. We all know that there are eight major planets in the solar system, and there is only the earth, a civilized planet. The Milky Way has 100-400 billion stars, and the number of terrestrial planets is as high as trillions. Many of them are ecological planets similar to the earth, and they all have the possibility of life.
The current observable universe of mankind is 93 billion light-years. Within this range, there are approximately 2 trillion “galaxies” and trillions of stars. The number of planets is even more difficult to estimate. Is 93 billion light-years the whole universe? Obviously not. Although we don’t know how big the universe is, the limit is definitely not 93 billion light-years. It may be several times, dozens of times, or 93 billion light-years is just the tip of the iceberg of the universe.
We don’t consider the entire universe, just take the current observable range of human beings. With such a huge planetary base, human beings are the only intelligent life in the universe. Do you think it is possible? The answer is obvious, and scientists naturally understand this, so after humans walked out of the earth, they began the search for extraterrestrial civilization.
By launching interstellar probes, actively sending signals to the universe, and detecting signals of possible alien civilizations, scientists have been “screaming” at the vast universe for more than half a century, but so far we have not received any response, nor have we received any response. Discover any architectural traces related to alien civilization.
Why can’t we find an alien civilization until now? In response to such doubts, scientists have also put forward a variety of conjectures. Some scientists believe that the position of the solar system is really too biased. Human beings are in a desert earth and it is naturally difficult to get any response.
But this conjecture is actually not reliable. According to a large number of exploration studies by scientists, it is believed that the solar system has a habitable zone, and the Milky Way also has a habitable zone. Only galaxies in the habitable zone can give birth to planets of life and give birth to intelligent civilizations. The solar system happens to be in the habitable zone of the Milky Way, so from this perspective, the location of the solar system is not a desert for civilization, but a very good space suitable for the development of civilization.
Scientists have also proposed universe laboratory conjectures, virtual universe conjectures, and so on. These conjectures make us feel incredible, but there are many things that are difficult to self-consist, and they have not been recognized by many people. Among the many conjectures, the most recognized one should be the “Black Forest Law”.
The law believes that the universe is like a dark forest, and each civilization is the creatures in this forest, they are both hunters and prey. Since we don’t know whether the other party is hostile, when two civilizations meet, we will choose to destroy each other and not give each other a chance to contact.
It is precisely the existence of the “Dark Forest Law” that in order to protect itself from harm, the cosmic civilization dare not make a sound easily in this forest. And to the shouts echoing in the forest, I dare not respond easily. It is possible that the signals sent by humans to the universe have been shouted everywhere in the dark forest of the universe. Many civilizations have also heard the shouts of humans, but because they don’t know whether humans are Friendly, so I dare not respond to us.
From the point of view of the natural law of “things compete in the sky, the survival of the fittest”, the universe is also equivalent to a larger natural environment. There is a dark forest law in the natural biological chain on earth, in a forest. The hunters and prey are always there. Carnivores always wait quietly for the herbivores, while the herbivores are also cautious, afraid to make a sound, for fear of being discovered by the carnivores. And carnivores are also prey, they are also always alert to humans.
If you think that the “Law of the Dark Forest” is so cruel, it prevents contact and communication between cosmic civilizations, and makes humans feel scared. Then another conjecture theory is even more terrifying to people, and it is the big filter theory. This is a bold conjecture proposed by Robin Hansen, a professor at George Mason University in the United States.
According to Robin Hansen’s theory, as long as it is a star in the habitable zone of the Milky Way, and a star in the galaxy that meets certain conditions, life can appear after a series of evolutionary processes. After an ecological planet is formed, inorganic matter will evolve into organic matter, and then organic matter will evolve into self-replication ability and become the early single-cell life.
Single-cell life continues to evolve for a long time, forming complex multi-cell life, and finally, intelligent life that can use and make tools appears. After the birth of intelligent life, it develops to the stage of civilization, then enters into scientific and technological civilization, and finally enters the age of the universe, opening the way for the expansion of the universe.
This series of evolutionary processes is like playing a level-breaking game. Only after this level can you enter the next time. According to the unpredictable number of planets in the universe, according to the evolution of this process, then our universe should have become very lively long ago, with life planets everywhere, and spaceships of intelligent civilization everywhere. But why do we see a dead silence? Where are these civilizations?
Robin Hansen speculated that the rules of the universe may have set an obstacle to the development of civilization, which is equivalent to a “big filter”. From the formation of life to the development of interstellar civilization, there may be a stage that is very difficult to cross. It blocks 99% of intelligent life. If it fails to pass the “big filter”, this civilization can only go to the end of destruction.
There may be many friends who think the “big filter” is too scary. Will such a thing really exist in the universe? In fact, as long as we think about the future of mankind carefully, you will find that the future of mankind is not so good. There are too many disasters that may end human civilization. For example, we have now entered the era of artificial intelligence. With its development, artificial intelligence in the future may evolve into its own meaning and thinking. This is definitely a terrible disaster for mankind.
Secondly, nuclear war can also bring humans back to their original form. This is only a devastating disaster caused by human beings, and there are many disasters from outside the earth. Asteroid impacts, supernova explosions, etc., are all likely to make humans The end of civilization.
There may originally be a large number of intelligent civilizations in the universe, but when civilization develops to a certain stage, it will encounter the “big filter”, and in the end, the entire civilization will fall back to the primitive stage or the entire civilization will disappear completely. So many civilizations in the universe can’t pass this “big filter”, so why can human beings pass?
Therefore, if the “big filter” theory is true, it is far more cruel to humans than the “dark forest law”. Of course, these are just our conjectures. If we want to confirm these conjectures, humans’ current technology cannot do it. Only when we become a primary interstellar civilization and can get out of the solar system, we may hope to explore other galaxies. .
If there were a large number of intelligent civilizations in the universe, even if they died out because they did not pass the “big filter”, then the galaxy will inevitably leave some civilization remnants on the planets that once existed. As long as we can find these relics, we can explore and study many things.