With the help of science and technology, human beings started the extraterrestrial civilization search project soon after they came out of the earth. Why do scientists search for alien civilizations? One reason is that out of curiosity, I want to know the difference between alien civilization and human civilization. Another reason is to understand the alien civilization. We must know that the future goal of mankind is the sea of stars.
When human beings become interstellar civilization, our spaceships will be able to reach various galaxies and begin to colonize other planets suitable for human survival. On the way of human interstellar exploration, we cannot avoid dealing with alien civilizations. As a different wisdom race, real peace and friendliness do not exist. Alien civilization may be a potential enemy of mankind.
Only when we fully understand the enemy can we go further and more safely in the starry path. Therefore, just after walking out of the earth, human beings began to explore and study the extraterrestrial civilization. When mankind just stepped out of the earth and saw the vast universe, scientists believed that the number of alien civilizations in a vast universe that has existed for 13.8 billion years may be beyond our imagination.
Among the numerous alien civilizations, some of them may be far more powerful in science and technology than the earth, and even have super civilizations hundreds of millions of years more advanced than human science and technology. According to the speed of human scientific and technological development, scientists predict that in tens of thousands of years at the latest, human beings will be able to become an interstellar civilization. At that time, there will be no problem in freely shuttling through the galaxy. If we are stronger, we will be able to go out of the galaxy and explore other galaxies.
If human beings can spend tens of thousands of years to enter the interstellar age, there is no reason why other intelligent civilizations can’t do it. Even if alien civilizations are not as smart as human beings, they can enter the interstellar age as long as they are given more than twice as much time as human beings. According to the development speed of science and technology, there should be many interstellar civilizations in the universe. They can easily cross the interstellar to the solar system.
If an alien civilization has come to the solar system or the earth, it can leave some traces. In the view of scientists, today’s galaxy should also be very busy. There is no reason why interstellar civilization can’t find the existence of earth and human beings when exploring among galaxies. For an interstellar civilization, if we find a civilized planet such as the earth in the journey, no matter from which aspect, we should have some contact with human beings to let us know something about the civilization of the universe.
The ideal is beautiful, but the reality often disappoints us very much. The extraterrestrial civilization search project has been carried out for more than half a century, and human beings have invested a lot of manpower and energy. However, so far, we have not found any trace related to extraterrestrial civilization. We have not found any trace of extraterrestrial civilization in the solar system and the earth.
We also did not find any real signals of alien civilization in the universe, and we did not observe any of those super spaceships of alien civilization in science fiction movies. We haven’t even seen one of the super man-made projects that scientists once suspected of circling stars like the Dyson sphere.
Some scientists believe that when a civilization develops to the second stage, if it wants to solve the problem of huge energy demand, it will focus on the stars. If a star is surrounded by a Dyson sphere, the brightness of the star will change obviously.
There’s no reason why we can’t observe it through astronomical telescopes, but so far, although we have found some stars with abnormal light changes, we still can’t really determine whether there is a Dyson sphere structure around them. Originally, in the view of scientists, the universe should be relatively lively. There should be interstellar civilizations shuttling between galaxies, and then leave some important traces to tell other civilizations that they have been here.
But we see the universe is very lonely, it seems that only human civilization. However, from the perspective of the vastness of the universe and many earth like planets that are very similar to the earth, we have reason to believe that there are a lot of alien civilizations, but why can’t we find any? The astronomer Fermi once doubted this and put forward the famous Fermi paradox.
For such doubts, scientists have put forward a variety of conjectures, such as the theory of cosmic laboratory, virtual cosmology and so on. These theories seem to be reasonable, but after careful analysis and thinking, they are unlikely. Scientists have put forward all kinds of possible conjectures, but few people will consider such a possibility: that human beings may be the most advanced civilization in the universe.
Many people will make complaints about it: the universe has a history of 13 billion 800 million, but human beings are born only millions of years. How could it be the most advanced civilization in the universe? In fact, as long as we think about and analyze it carefully, you will find that this possibility is still great.
First of all, we need to understand that the universe originated 13.8 billion years ago. At present, it is not a very accurate number. The age of the universe will continue to be adjusted with the continuous progress of human science and technology in the future. It is possible that the age of the universe is far from 13.8 billion years, much younger than this.
No matter how old the universe is, it is much bigger than the solar system and the earth. Let’s take the age of the universe as 13.8 billion. Before it was born, the universe had nothing. Only at the moment of its birth did it produce the first basic elements such as hydrogen and helium.
The universe only depends on hydrogen, helium is unable to achieve perfect evolution, so the universe after a long period of time, hydrogen continues to condense to form a nebula, the center of the nebula was born stars. The star is mainly composed of hydrogen, which is a controllable nuclear fusion reactor. Through the nuclear fusion reaction, hydrogen is continuously converted into heavier elements such as oxygen and iron.
At the end of stellar life, there will be supernova explosion, which will refine and transform elements again and evolve more important elements. In this way, the elements of the universe were constantly enriched, and the later star systems and earth like planets came into being. From nothing to a space with rich elements, the universe took a long time.
It is difficult for scientists to give an accurate figure of this time, but it is at least 800 million years. That is to say, it is 800 million years after the birth of the universe that a large number of earth like planets began to appear. And earth like planets are the birthplace of life, so will there be life soon after the birth of earth like planets? Of course not. It will take hundreds of millions of years of planetary evolution to form a stable ecosystem.
The evolution of this period will take at least 1.5 billion years, that is to say, the earliest birth time of life in the universe is 1.5 billion years after the birth of the universe. However, the birth of life planet is only the beginning. It will take billions of years for a life planet to evolve rich and complex life forms.
Life on earth was born 4 billion years ago. It was not until 500 million years ago that there was a big explosion of life and species began to enrich. After the richness of life species, it needs a variety of coincidences and luck to re evolve intelligent life. Human beings are very lucky to be born millions of years ago.
From the above analysis, we can see that the earliest intelligent life in the universe may have been born 6 billion years after the birth of the universe. Of course, this time is much earlier than the time when human beings were born. After intelligent life, it takes a long time for civilization to form. It takes a long time for civilization to develop again. Only in the era of science and technology can we explore the universe.
It will take at least millions of years for intelligent civilization to embark on the road of science. But in such a long time, will the ecology of the planet be smooth sailing? Of course not. Taking the earth as an example, we can see that in the millions of years of human evolution, we have suffered a lot of natural disasters. If human beings had not been lucky enough to have multiple branches of development, they would have been extinct.
Millions of years ago, the intelligent life of the earth was not the only branch of human ancestors, but there were many branches of wisdom. Later, in the process of development, only the branch of human survived. Other branches have disappeared successively. It can be seen that even if a planet is born with intelligent life and wants to develop to the stage of civilization, it will probably disappear due to various natural disasters.
In addition to the disaster of the planet’s own system, what’s more terrible is all kinds of disasters from space, such as asteroid impact, stellar energy explosion and so on. These disasters from space are far more terrible than the ecological disasters of the planet itself, which can easily end the era of life. The reason why the earth has been able to develop steadily for billions of years without frequent impacts from large asteroids is that the earth has two protectors, one is Jupiter, and the other is the moon.
The earth is protected by two planets, and other living planets may not be so lucky. Therefore, there may be a lot of life planets in the universe, but only a few can really give birth to intelligent life. After the birth of intelligent life, it is difficult for most of the intelligent races to survive through various tests from the planet itself and space.
If a planet does not have a safe and stable external environment, it will encounter a huge asteroid impact every long time. Then it is difficult for the intelligent civilization of this planet to really develop. Whenever a civilization is about to enter the era of science and technology, or has just entered the era of science and technology, it will usher in a devastating disaster from space.
In this way, the disaster from space ended a civilization, and the ecology of the planet recovered after a long evolution. At the beginning of a new round of life evolution, and finally the birth of intelligent civilization, but after it developed, it encountered a devastating disaster. This kind of reincarnation continues, the civilization of this planet has never been able to enter the interstellar age.
Therefore, some planets in the universe may have been born billions of years earlier than the earth, and they became intelligent civilization planets billions of years ago. However, due to the continuous reincarnation of civilization, it is still unable to get out of the parent star and go to the interstellar. And the earth has too many advantages to maintain the safety and stability of outer space, so human beings can develop until now.
Through these analyses, we can see that human beings may not be the most advanced civilization in the universe. If so, then we can’t find alien civilization, which is a good explanation. Because we have not yet become an interstellar civilization, so are other alien civilizations. Perhaps in every corner of the universe, different intelligent civilizations are thinking the same way: will there be any alien civilization in the universe? Where will they be?