In the middle of the last century, with the help of science and technology, mankind finally walked out of the earth and saw a vast universe. Only after we truly walked out of the earth did we know how small the world in which humans exist, and how vast the universe outside of the earth is. In front of the universe, the earth may not even be counted as a particle of dust.
It is such a small earth that gave birth to intelligent life and civilization like human beings. From the perspective of the universe, most people believe that alien civilization exists, and some civilizations may far exceed the strength of human beings. A point we can’t imagine.
Scientists also believe that extraterrestrial civilizations exist, so after humans left the earth, they launched a great extraterrestrial civilization search program. The purpose of this project is to find possible alien civilizations in the universe and various traces related to alien civilizations.
Originally, scientists were hopeful about searching for alien civilizations, but more than half a century has passed. So far, we have not found anything. Don’t talk about face-to-face communication with alien civilizations, even if there are traces of alien civilizations, we still haven’t noticed them at all.
Don’t alien civilizations exist? But from the perspective of the vastness of the universe and its age of 13.8 billion years, it is difficult for us to deny the existence of alien civilizations. If alien civilizations exist, where are they? Why can’t we find it? This is the Fermi paradox proposed by the famous astronomer Fermi.
For the Fermi paradox, scientists have also put forward various conjectures. Some scientists speculate that the earth and the solar system may be a biological laboratory for alien civilizations, and humans are the “guinea pigs” in this laboratory. Some scientists have also speculated that our universe may be a virtual universe, and everything in the universe, including humans, is just a piece of program code.
The above speculations are difficult for people to accept. In the eyes of most people, the main reason why we cannot search for alien civilizations is that the distance of the universe is too exaggerated, and the scientific and technological strength of human beings in the universe is very weak and cannot be truly achieved. Exploring in the interstellar, naturally you can’t come into contact with alien civilization.
If human beings have the technological strength of interstellar navigation and can move freely in the Milky Way, then it may not be so difficult to discover alien civilization. Of course, the improvement of scientific and technological strength cannot be achieved in a short time. It takes a long process. From the current speed of human scientific and technological development, scientists believe that we need to master the preliminary subluminal flight, and it may take at least several hundred. Years or thousands of years.
Before mankind has become an interstellar civilization, we should not expect to go out of the solar system and go to the interstellar to search for alien civilizations. Although human beings will not be able to go to the interstellar to explore the existence of aliens for a long time in the future, we are expecting an alien civilization to come to the solar system and visit the earth.
Some scientists believe that since there are many extraterrestrial civilizations in the universe, and some extraterrestrial civilizations may be far more powerful than human beings, or have already become interstellar civilizations, why is there no extraterrestrial civilization to visit the earth? Didn’t they discover the special nature of the earth and the existence of human beings?
I believe many friends have such doubts. Although Einstein’s theory of relativity restricts the speed of objects, it also puts forward the great general theory of relativity. Under this theory, the speed of light can be broken, and the object itself Speed cannot exceed the speed of light, but due to the distortion of space, space itself can exceed the speed of light.
The existence of space distortion can theoretically allow spacecraft to achieve space-leaping superluminal shuttles. If the technological strength of alien civilization develops to this level, then interstellar navigation is not difficult, even in galaxies near the solar system, if Wisdom civilization has mastered the subluminal flight technology, and theoretically it is hopeful to be able to come to the solar system, but why have we not found any traces of alien civilization visiting the earth?
It is possible that since the birth of mankind, no extraterrestrial civilization has visited the earth. If this is the case, it would seem a bit strange. Isn’t one of the many civilizations in the universe developed to the stage of interstellar civilization? In this regard, some scientists have put forward a guess: it may be that the cost of alien civilizations visiting the earth is too high.
I believe many friends know that in the late 1960s, the United States carried out the great Apollo moon landing plan. After several moon landings and 12 astronauts to the moon, more than 50 years have passed, and the United States has never carried out manned operations again. Moon landing. Many people are puzzled about this. Humans could achieve manned moon landings 50 years ago. Now that 50 years have passed, mankind’s scientific and technological strength has already been greatly improved. Is there any difficulty in landing the moon?
In fact, for the current human space technology, manned moon landing is not too difficult, but why the United States and other aerospace powers did not carry out manned moon landing? The reason is not complicated, mainly because the cost of manned landing on the moon has become high. In the last century, the United States spent a total of US$25.4 billion on manned moon landings. This figure was a huge sum of money at the time. Except for the United States, no country in the world could afford it, even the United States’ economy. It was almost dragged down by the moon landing.
The manned moon landing is just an ultra-high-consumption lunar trip, at most, bringing back some soil and rocks from the surface of the moon. Other research values are not. This kind of work can actually be done by an unmanned moon landing probe. For example, my country’s Chang’e 5 successfully brought back a lot of rocks from the moon, and the weight is much more than that of the United States.
It can be seen that manned landing on the moon is completely a loss-making business, and the cost is too high for a country to afford. Space exploration is a completely money-burning process. Human beings only launch some unmanned probes in the exploration of Mars, which also incurs huge costs. If manned to land on Mars, it may cost even more.
According to the research of scientists, humans want to build a spacecraft that can fly out of the solar system. According to the current price, it may need at least 2.75 trillion US dollars. Human beings need to pay high costs to explore the universe, so the exploration of the universe by alien civilizations is also not free, and it also requires a lot of cost support.
Even if the alien civilization has the ability of interstellar navigation, it is believed that each long-distance voyage will also require high costs. After all, the advancement of a spacecraft requires huge energy, whether it is sub-light or super-light flight, the required energy is inevitable. It is a huge number.
In particular, the super-light speed of space warping requires energy not only in quantity but also in quality. General energy cannot meet this demand at all. Perhaps only dark energy can. And more advanced energy also means that its cost is higher. Therefore, the goal of extraterrestrial civilization’s interstellar voyage is not casual, but to see if the cost can be recovered.
Perhaps the alien civilization has already discovered the existence of the solar system and the earth, and also knows that there are humans on the earth, but through observation and research, it is found that the solar system is a galaxy with very scarce resources, and there is no special high-value energy around the solar system.
In this case, alien civilization will not spend a high cost to come to the solar system, because this is a loss-making business. In fact, such a thing is well understood. If we have sub-light technology, we will also observe There are living planets in the neighboring galaxy.
Perhaps in the eyes of many people, we have discovered the planet of life and have the ability to go there. We should explore it. However, starting from the earth to the neighboring galaxy, the cost of going back and forth may set the entire human economy back for decades. Let’s ask Will we go ahead? Believe not, unless something in the neighboring galaxy is related to the survival of human beings.
Therefore, one reason why alien civilizations do not come to visit the earth is because their technological strength has not yet reached the ability to shuttle between stars. Another reason is that there is nothing high-value in the solar system, which is worth the high cost of the alien civilization. Visit.