With the help of science and technology, human beings started the search for extraterrestrial civilization shortly after leaving the earth. Why do scientists search for alien civilizations? One reason is out of curiosity, wanting to know how alien civilization is different from human civilization. Another reason is to understand the alien civilization, to know that the future goal of mankind must be the stars and the sea.
When human beings become an interstellar civilization, our spacecraft will be able to reach various galaxies and begin to colonize other planets suitable for human survival. On the road of human interstellar exploration, it is inevitable to deal with alien civilizations. As different intelligent races, true peace and friendliness do not exist, and alien civilizations may be potential enemies of mankind.
Only by fully understanding the enemy can we go farther and safer on the way to the stars. Therefore, just after human beings walked out of the earth, they began to explore and study extraterrestrial civilization. When human beings just walked out of the earth and saw the vast universe, scientists believed that in a vast universe that has existed for 13.8 billion years, the number of alien civilizations may be too large for us to imagine.
Among the many extraterrestrial civilizations, some of the technological strengths may far exceed that of the earth, and there are even super civilizations that are hundreds of millions of years advanced in science and technology than humans. We should not be surprised. Scientists predict based on the speed of human technological development that humans will be able to become an interstellar civilization within tens of thousands of years at the latest. At that time, there is no problem with free shuttle in the Milky Way, and even stronger ones can go out of the Milky Way and explore other galaxies.
Human beings can spend tens of thousands of years into the interstellar age, so other intelligent civilizations have no reason and cannot do it. Even if alien civilizations are not as smart as humans, they can also enter the interstellar age as long as they are given many times more time than humans. According to the speed of technological development, theoretically there should be many interstellar civilizations in the universe, and they can easily cross the interstellar to the solar system.
If an alien civilization has been to the solar system or the earth, it can leave some traces. In the opinion of scientists, the current Milky Way galaxy should also be very lively. Interstellar civilizations explore among various galaxies, and there is no reason why the existence of the earth and humans cannot be discovered. For an interstellar civilization, a civilized planet like the Earth is discovered on the way to the stars. Regardless of which aspect is considered, it should have some contact with humans and let us understand some of the cosmic civilization.
Ideals are beautiful, but reality often disappoints us. The extraterrestrial civilization search program has been carried out for more than half a century. Humans have invested a lot of manpower and energy, but so far, we have not found anything related to extraterrestrial civilization. We have not found any traces of the presence of alien civilizations in the solar system or on the earth.
We also haven’t found a real alien civilization signal in the universe, and we haven’t even observed one of those alien civilization superships in science fiction movies. We haven’t even observed a super man-made project such as the Dyson sphere orbiting a star that scientists once suspected.
Some scientists believe that when a civilization develops to the second stage, if it wants to solve the huge energy problem, it will focus on the stars. To fully absorb the energy of a star, the super structure of the Dyson sphere is needed to surround the star. If a star is surrounded by the Dyson sphere, the light and darkness of the star will inevitably change significantly.
We have no reason to be unable to observe through astronomical telescopes, but so far, although we have found abnormal changes in the brightness of some stars, we have not been able to truly determine whether there are Dyson spheres around them. Originally, in the eyes of scientists, the universe should be relatively lively, and there should be interstellar civilizations that shuttle between galaxies, and then leave some important traces to tell other civilizations that they have been there.
But the universe we see is very lonely, and it seems that there is only one civilization of humans. But from the perspective of the vastness of the universe and the many terrestrial planets that humans have observed and discovered so far that are very similar to the Earth, we have reason to believe that there are a large number of extraterrestrial civilizations, but why can’t we find any of them? Astronomer Fermi once also questioned this and put forward the famous Fermi paradox.
For such doubts, scientists have put forward a variety of conjectures, such as the theory of the universe laboratory, the theory of the virtual universe, etc. These theories seem to have some truth, but after careful analysis and thinking, I find it impossible. Scientists have put forward various possible conjectures, but few people will consider such a possibility: that is, it is possible that human beings are the most advanced civilization in the universe.
Seeing this, many people will complain: the universe has a history of 13.8 billion, and mankind has only been born a few million years. How could it be the most advanced civilization in the universe? In fact, as long as we carefully consider and analyze it, you will find that this possibility is still very high.
First of all, we have to understand that the universe originated 13.8 billion years ago, and it is not a very accurate number. The age of the universe will continue to be adjusted with the continuous advancement of human technology in the future. It is possible that the age of the universe is far from 13.8 billion years, which is much smaller than this.
No matter how old the universe is, it is much older than the solar system and the earth. We count on the age of the universe at 13.8 billion. Before it was born, there was nothing in the universe. Only at the moment of its birth, the first basic elements such as hydrogen and helium were produced.
The universe only relies on hydrogen, and the helium element cannot achieve perfect evolution. Therefore, after a long period of time in the universe, the hydrogen element continues to condense to form a nebula, and stars are born in the center of the nebula. The star is mainly composed of hydrogen. Inside it is a controllable nuclear fusion reactor, which continuously converts the hydrogen element into oxygen, iron and other heavier elements through the nuclear fusion reaction.
Supernova explosions will occur at the end of stellar life, which will once again refine and transform the elements to evolve more important elements. In this way, the elements of the universe were constantly enriched, and later star systems and terrestrial planets were formed. From nothing to a space with rich elements, the universe has paid a relatively long time.
At this time, it is difficult for scientists to give accurate numbers, but it is at least 800 million years, which means that after the universe was born 800 million years, a large number of terrestrial planets began to gradually appear. And terrestrial planets are the birthplaces of life, so will life appear soon after the birth of terrestrial planets? Of course not. It takes hundreds of millions of years of planetary evolution to form a stable ecosystem.
This period of evolution will take at least 1.5 billion years, which means that the earliest life in the universe was born 1.5 billion years after the birth of the universe. But the birth of a living planet is just the beginning. It will take at least billions of years for a living planet to evolve a rich and complex life form.
Life on Earth was born 4 billion years ago, and it wasn’t until 500 million years ago that there was a life explosion, and species began to be enriched. After the enrichment of life species, it takes a variety of coincidences and luck to evolve intelligent life again. Human beings are very fortunate to be born millions of years ago.
Through the above analysis, we can see that the earliest intelligent life of the universe may be 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 will take a long time to form a civilization, and civilization will take a long time to develop into the era of science and technology before it can explore the universe.
It takes at least millions of years to develop a smart civilization before it can hope to embark on the path of science, but in such a long period of time, will the planet’s ecology be smooth sailing? Of course not. We can see from the earth as an example that in the millions of years of human evolution, we have encountered many natural disasters. If humans were not lucky enough to have multiple branches of development, they may have long been extinct. Up.
Millions of years ago, the intelligent life on the earth was not the only branch of human ancestors, but multiple branches of wisdom. Later, in the process of development, only the branch of humans survived. The other branches all went extinct and disappeared. It can be seen that even if a planet is born with intelligent life and wants to develop to the stage of civilization, there is a high probability that it will become extinct due to various natural disasters.
In addition to the disasters of the planet’s own system, what is even more terrifying is the various disasters from space, such as asteroid impacts, explosions of stellar energy, and so on. These disasters from space are far more terrifying than the ecological disasters of the planet itself, and can easily end the age of life. The reason why the earth has been able to develop steadily for billions of years without frequent collisions of large asteroids is because the earth has two protectors, one is Jupiter and the other is the moon.
The earth is protected by two planets, and other life planets may not have such good luck. Therefore, many life planets in the universe may have been born, but only a few can actually give birth to intelligent life. After the birth of intelligent life, it will be difficult for most intelligent races to survive 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 period of time. Then it is very difficult for the intelligent civilization of this planet to truly develop. Whenever a civilization is about to enter the age of technology, or has just entered the age of technology, it will usher in a devastating disaster from space.
In this way, a disaster from space ended a civilization, and the planet’s ecology was restored after a long period of evolution. A new round of evolution of life began, and finally a smart civilization was born, but after its development, it encountered a devastating disaster. In this way, the cycle continues, and the civilization of this planet has never been able to enter the interstellar age.
Therefore, some planets in the universe may be born billions of years earlier than the earth, and they also became intelligent civilization planets billions of years ago. However, due to the continuous cycle of civilization, it is still unable to get out of the home planet and go to the interstellar. The earth has too many advantages, maintaining the safety and stability of outer space, so human beings have been able to develop to the present.
Through these analyses, we can see that human beings may not be the most advanced civilization in the universe. If this is the case, then it would be easy to explain that we can’t find alien civilization. Because we have not yet become an interstellar civilization, other alien civilizations are naturally the same. Maybe in every corner of the universe, different intelligent civilizations are also thinking about: Will there be alien civilizations in the universe? Where will they be?