Humans start the right way to search for extraterrestrial civilization, and we still need to start with Tesla receiving a weird electric wave signal in 1899 in its spring laboratory in Colorado. When Tesla analyzed this radio wave and found that it was probably from an unknown extraterrestrial civilization, he decisively announced the news.
However, people at the time did not even know what electromagnetic waves were, and Tesla’s remarks were generally mocked by the scientific community as soon as they were put forward. It was not recognized by mainstream science until 1932. It can be seen that in the process of human understanding of the universe, it is not as smooth and natural as we imagined.
However, Tesla did not give up his idea. He firmly believed that there must be other civilizations in the universe. Although Tesla was lonely at the time, it was because of his persistence and dedicated research on electromagnetic waves that latecomers could stand on the shoulders of giants and move on.
Today, humans have invented large-aperture radio telescopes. Compared with the rudimentary observation and receiving equipment of Tesla's time, they can obtain more evidence and have more say. This has led to the formation of a universal consensus in human society: "There may really be other lives and even civilizations in the universe."
But the universe is so vast, where should we look for extraterrestrial life?
Faced with this problem, I believe many people will blurt out " livable belt ".It is true that the "livable zone" is indeed a reliable standard based on the experience of the earth. Of course, we do not rule out that it is impossible to produce life in non-habitable zones, but it is much easier to find life from our earth’s experience than to find traces of life in a state where there are no laws to follow.
However, it is not accurate enough to search for life by "livable zone" alone. Take the solar system as an example. Planets in the habitable zone include Venus and Mars in addition to the Earth. But from the current observations, only the earth has produced life. Of course, there is also a possibility that Venus and Mars once produced life, but due to some reason, these two planets have undergone tremendous changes, which makes them no longer suitable for life to thrive and become barren today. Or maybe part of the earth's species, including a part of human beings, immigrated from Venus or Mars.
But no matter how many possibilities there are, at least in the current situation, life exists only under the conditions of the earth. So, in addition to the prerequisite for the livable zone, what additional conditions are needed to produce life? Perhaps the more precise the conditions, the more helpful it is for us to find traces of aliens.
Take the earth as an example. In addition to being in a habitable zone, the earth must also have sufficient water and atmosphere. These two conditions sometimes complement each other. If the atmosphere is thin, the water vapor will easily be blown away by the solar wind , and it will eventually be as barren as Mars. But if the atmosphere is too thick, especially if greenhouse gases like carbon dioxide account for a very high proportion, it will trigger the greenhouse effect, making the planet's surface temperature too high for life to survive, just like Venus today. However, the earth is no more, no less, just right. Based on this, suitable temperature and climatic conditions have been formed, providing prerequisites for the gestation of life.
However,The reason why the earth has such unique and advantageous conditions has a lot to do with the rotation speed of the earth. We know that the rotation speed of the earth in is fast enough to melt the iron in the core of the earth into liquid and generate a magnetic field. The magnetic field is strong enough to prevent the atmosphere from being blown away by the solar wind.
From the perspective of the earth, not all regions are suitable for the production and reproduction of life. Although water is the source of life, all life originated from water at the beginning, but with continuous evolution, more and more species have moved from the ocean to the land, and even fly to the sky, and are separated from the species of the ocean. They are more sensitive to weather conditions than in the ocean. Therefore, it is particularly important to choose an area suitable for survival. Therefore, from the perspective of the earth, there are also habitable zones.
If we look at the birthplace of the ancient civilization of mankind, you will find that whether it is the earliest civilization discovered so far, the Sumerian civilization, or the ancient Egyptian civilization, The Babylonian civilization, or the Chinese civilization of China, etc., are all geographically concentrated in the vicinity of Tropic of Cancer. This phenomenon is by no means a coincidence, but because the geographical location of the many plains of the Tropic of Cancer, the warm and pleasant climatic conditions and the comprehensive conditions of abundant water resources are more suitable for the development of civilization.
Since there is a habitable zone on the earth and the solar system also has a habitable zone, combined with the understanding that all things in the universe reflect similar laws from small to large, it should be extended to the Milky Way and the entire universe.
Take the Milky Way as an example, the so-called habitable zone may be the location where suitable stars can be born, at least the location where stars that are not too big or small can be born, and these stars cannot be too large. young,Nor can he have entered his old age. Because the size and lifetime of stars affect the strength of the solar wind and magnetic field, as well as the temperature, this will have a critical impact on the ability to produce life.
We know that the center of every huge galaxy is rotated by a huge black hole. Then galaxies closer to the black hole will be affected by the huge radiation of the black hole, which makes it difficult to produce life. Therefore, in theory, galaxies farther from the black hole are more likely to produce life.
In addition, the most important thing is that there must be sufficient metal elements on a planet so that biological substances can be formed in the process of organic chemical reactions. The way in which the metal element can be produced in the universe is believed to be related to the nuclear reaction of stars and supernova explosions.
Scientists have discovered through observations that the center of the galaxy emits unusually dazzling light, which is formed by the super-large supernova explosion that occurred at the beginning of galaxy formation. Because the super-large-scale explosion is carried out in the center of the galaxy, the distribution of metal in the galaxy will not necessarily be balanced. The closer to the center, the higher the content of metal material.
But as we said earlier, there is too strong black hole radiation shock wave near the center, so if you consider the middle of the two galaxies, then in the ring The zigzag zone should be the habitable zone of the galaxy. It is the same as the distance between the solar system where the earth is located and the center of the galaxy, , and the center of the galaxy.
If this idea is applied to the entire universe, there should also be a concept of a habitable zone, but the scientific community has not yet figured out the specific conditions for the existence of this habitable zone. But this at least provides us with an idea, that is, looking for extraterrestrial life and even civilization according to the idea of the proposed habitable zone will be much more efficient than ramming like a headless fly. Perhaps one day in the future, when humans develop a vehicle that can exceed the speed of light, it will become possible to find aliens in the vast universe.
.-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-