The earth is a beautiful blue planet. There are many creatures on the earth, including marine creatures , terrestrial creatures, amphibians and many microorganisms. Among many creatures, human beings are the most intelligent life on the earth. Human beings have been constantly exploring the mysteries of the world since their birth. After thousands of years of scientific and technological development, human beings have now been able to leave the earth and explore the universe. This shows that the speed of human technological development is still very fast. When human beings go out of the earth and see the universe , human curiosity is attracted by the vastness of the universe. Human beings want to know how big the universe is? In addition to life on earth, is there also alien life in the universe? With these questions, mankind embarked on the path of exploring the universe.
At present, the diameter of the universe that humans can observe is about 93 billion light-years, and this is not the entire scope of the universe. The universe may be larger than we imagine. There are countless planets and stars in the universe. Many scientists believe that In addition to life on earth, there must be other alien life in the universe. In order to find alien life, scientists have also made a lot of efforts. 45 years ago, scientists launched the Voyager 1 probe outside the solar system. , the purpose of launching this probe is to let it fly out of the solar system and explore the mysteries outside the solar system. However, after so many years, the Voyager 1 probe has not flown out of the solar system. According to calculations, scientists have calculated that according to Voyager 1 At the current speed of the probe, it will take at least tens of thousands of years to completely fly out of the solar system.
Tens of thousands of years is too long for humans, so now scientists looking for extraterrestrial life basically rely on astronomical telescopes to observe. However, after so many years, scientists have not found aliens in the universe. Could it be said that aliens really do not exist? Many scientists believe that we may have been wrong from the beginning. Why do they say this? Because humans basically search for extraterrestrial life based on the conditions for the birth of life on Earth. Scientists believe that the reason why life can be born on the Earth is mainly because the Earth meets the three basic conditions for the birth of life. These three basic conditions are respectively It is suitable temperature, sufficient air and abundant water resources.
If other planets can meet these three basic conditions, then the possibility of life being born on other planets is also very high. Therefore, when scientists search for extraterrestrial life, they basically search according to these conditions. If they want to meet these conditions, Then the location of the planet must be in the habitable zone of star system , because only in this way can the temperature on the planet be suitable for life to survive, and this greatly reduces the scope of the search. Perhaps alien life is completely different from what we imagined. Similarly, maybe alien life can survive without sunlight, air, and water resources. If this is the case, then humans are going in the wrong direction in searching for alien life.
In addition to this reason, another more important reason is that human technology is not developed enough. Although humans can now use astronomical telescopes to observe, astronomical telescopes can only observe the approximate position of the planet, but cannot see the planet. The specific situation, this greatly reduces the probability of finding alien life. If humans can land on other planets in person, then the possibility of humans finding alien life will become greater. However, at the current flight speed of humans, even the solar system There is no way to fly out, let alone fly to other planets. If you want to fly to other planets, humans must increase the speed of the spacecraft, at least to reach sub-light speed.
Therefore, if humans want to find extraterrestrial life, they still need to continue to work hard. Seeing this, many friends may say, if extraterrestrial life really exists, then why don't they come to the earth? Scientists believe that there are many advanced civilizations in our universe, and their civilization is more powerful than human civilization. It should not be difficult for them to fly to the earth, so why haven't they come to the earth? Scientists have discovered through research that the solar system is located in a remote area of ​​ Milky Way , 26,000 light-years away from the center of the Milky Way. Most of the stars and planets in the Milky Way are located in the central area of ​​the Milky Way, so there are many resources in the center of the Milky Way.
For an advanced civilization, resources are the most important. Although there are many resources on the earth, these resources are the lowest level and can only meet the current needs of mankind. For an advanced civilization, these resources are of no use at all. No, they need the energy of stars, or the energy of black holes, so they cannot see this resource on the earth at all. This may be the reason why aliens have not come to the earth, and every civilization needs to hide itself in the universe , this is actually to protect ourselves, because we still don’t know how many alien civilizations there are in the universe, let alone what level their civilizations are.
If you follow the dark forest law in the three-body novel, then any civilization that exposes itself may bring about a disaster of destruction. Therefore, even if many alien civilizations discover the earth, they are not willing to come to the earth because they Unlike exposing oneself, the same goes for human beings. If humans expose themselves rashly, it may bring disaster of extinction. Therefore, Hawking once warned humans not to contact extraterrestrial civilizations easily. So far, scientists have received There are many wireless signals in the universe. These wireless signals may be emitted by celestial bodies in the universe, or they may be emitted by alien civilizations. Since human technology is not developed enough, humans have no way to decipher these wireless signals.
If these wireless signals are really sent by alien civilizations, then humans need to be vigilant. Since the signals sent by aliens can be transmitted to the earth, it means that the technology of alien civilizations must be very powerful. If they discover the earth , is likely to launch an attack on the earth, so many people believe that humans should not easily contact alien civilizations. Whether alien civilizations exist in the universe is a topic that has been debated endlessly in the scientific community. However, according to current human understanding of the universe As you know, most people believe that extraterrestrial life exists, but we have not found them yet. The editor believes that humans are the most intelligent life on earth. Human technology is constantly improving. In the future, as human technology advances, With development, maybe we can find alien civilizations. Do you have anything to say about this?
