Why do people always think that aliens are better than humans? Determined by the distance of the universe.

Albert. Albert Einstein

In modern times, one of the most discussed topics about the starry sky in the universe is aliens. Before humans left the earth, although some people had been discussing topics related to aliens, at that time, people still had a lot of doubts about the existence of aliens.

It was not until mankind really walked out of the earth and saw the vast universe that this questioning voice disappeared. Some people may say that human beings have been searching for alien civilization for more than half a century, not to mention the simplest form of life. We never found it. Why do people still believe in aliens?

In fact, this question is very simple. When the frog is at the bottom of the well, his vision is narrow and his cognition is limited. You will also question whether there will be other life in the world outside the well. However, when the frog jumped out of the well and saw the vast world outside the well, the original doubt did not exist.

The same is true of human development and cognition. Before we left the earth, our understanding of the starry sky overhead was very limited. We didn't know how big the world outside the earth was and what kind of world it was. At that time, it was normal for us to question the existence of aliens.

However, when we really get out of the earth and see the vast space, this voice of doubt disappears. From the perspective of the universe, there are too many stars, planets and galaxies to be described by numbers. Under the huge base, as long as the probability of the existence of aliens is greater than zero, the number of alien civilizations will be a very large number in the whole universe.

What's more, it has been 654.38+038 billion years since the birth of the universe, and the time for the birth of mankind is only a few million years. Even from the age of the universe, we don't have to doubt the existence of alien civilization. Moreover, with the continuous progress of human science and technology and the continuous improvement of the cognition of the universe, there have been more and more discussions about aliens in recent years.

Through observation, we find that when people discuss topics related to aliens, an inherent view is that aliens are always stronger than humans. No matter in people's discussions or in many sci-fi materials, the power of aliens is crushing human beings. So some people have this question: Why do people always think that aliens are better than humans? Are there no aliens weaker than humans?

In fact, human cognition is mainly determined by the vast distance of the universe. Why do you say that? As we all know, the light year is the most basic unit of distance in the universe, which is equivalent to measuring distance in meters on the earth. In the vast universe, distance is a very exaggerated number, and only light years can be used for better statistics and calculation.

A light year is the distance that light travels at the speed of light for one year. A light year is about 9460730472580 kilometers. Seeing this picture, I believe everyone can intuitively understand how exaggerated the distance of the universe is. It is the vast cosmic distance that makes the distance between stars relatively large, averaging over several light years. For example, the nearest star to the earth is 4.2 light years.

Our search for alien civilization is naturally inseparable from exaggerated distance. According to the current observation and exploration, there is no second intelligent civilization in the solar system, so we can only look for alien civilizations in other galaxies outside the solar system. However, the exaggerated cosmic distance hinders our exploration. Although we can observe the distant starry sky through the astronomical telescope, it is only a very vague observation, and it is difficult for us to make a comprehensive observation of the planets in the solar system.

Therefore, it is very difficult to observe whether there is an alien civilization outside the department through an astronomical telescope, unless an alien civilization has built a huge thing in its own galaxy, such as the dyson sphere, which we can observe through the transit method. Of course, even if we observe such a scene, we are not sure that it must be a creation of civilization.

It can be seen that the vast distance of the universe has hindered mankind's search for alien civilization. With the current scientific and technological strength of mankind, we can't actively look for alien civilization, but we can only passively expect alien civilization to visit. If one day, we observe the existence of aliens, basically aliens come to the solar system and come to the earth.

Alien civilizations that can cross the planet and come to earth must be ahead of human beings in science and technology. As for how many years in advance, it depends on how far away the parent galaxy where the alien civilization is located is from us. If you come from a galaxy near the solar system, the distance may be dozens of light years at most, then the technological level of aliens may only be hundreds or thousands of years ahead of us.

If aliens come from more distant galaxies, such as thousands of light years or even farther, then their scientific and technological level is beyond our imagination, and may be at least tens of thousands or even hundreds of thousands of years ahead of us.

Some friends may say, is it impossible for an alien civilization that is very far away from the earth to lead us in science and technology for more than hundreds of years? Some friends think so because they think that alien civilizations will travel a long distance between stars and spend a long time visiting the solar system.

If aliens want to cross the star to the solar system, the speed of the spacecraft must reach at least sub-light speed. If it is an alien civilization near the solar system, flying at sub-light speed may take decades or hundreds of years to reach the solar system. This time is actually not long, because the rapid development of science and technology can also extend the life of intelligent life. If aliens have a life span of thousands of years, it is entirely possible to spend decades or hundreds of years in interstellar travel.

But if it is an alien civilization far away from the solar system, they want to come to the solar system in a short time. Sub-light speed is not enough, they must master the ability to fly faster than light speed. Some friends may say that if an alien civilization has the technical ability to build a "generation spaceship", it can also take a long time to cross the gate.

"Generation spaceship" refers to a spaceship that can provide a long-term stable ecological environment. Aliens can multiply in it for generations, and with the long-term survival guarantee in space, the "generation spacecraft" can not require such a large speed, but only need to keep flying to the target.

Because the problem of ecological survival has been solved, the "generation spacecraft" can theoretically sail in interstellar space all the time as long as it is not destroyed, and it takes hundreds of thousands of years, millions of years or even longer to reach the solar system from distant galaxies. However, there is a question: why does it take alien civilization so long to cross the stars to reach the solar system?

If humans master the technology of building "generation spacecraft" in the future, will it take hundreds of thousands of years or millions of years for us to go to a distant galaxy? I'm afraid that as long as there is nothing wrong with the brain, such a thing will not happen. Even if the alien's home galaxy comes to an end and can no longer survive, there is a high probability that it can find a place to live in nearby galaxies, or make some modifications to other galaxies to meet the needs of survival.

It can be seen that if alien civilizations come to the solar system from distant galaxies in the future, they have a high probability of mastering the ability of superluminal flight, otherwise they will not visit the solar system through the vast interstellar space. In either case, as long as alien civilizations come to the solar system and the earth, their scientific and technological strength will be at least several hundred years ahead of human beings.

Of course, this does not mean that there are no aliens weaker than humans in the vast universe. In fact, from the current observation and research, in the vast universe, human strength may not be weak, and most alien civilizations may be lower than human civilization. Even if there is an alien civilization stronger than human beings, it is rare, otherwise the solar system will not be so quiet.

When human science and technology develop to interstellar civilization, we can initially go out of the solar system to explore the surrounding galaxies. At that time, other intelligent civilizations may be discovered. Similarly, if humans can go to nearby galaxies to discover alien civilizations, the scientific and technological strength of aliens is likely to be lower than that of humans, otherwise they would have come to the solar system instead of waiting for us to visit.