Human beings have grown up step by step from the weak position of nature with their intelligent brain and become the new hegemon of the earth. It only took more than 5,000 years for human beings to enter the road of scientific development after the formation of civilization. It must be said that this is a miracle.
Science and technology have led mankind to open the door of the new century, allowing human civilization to achieve leap again and again, not only making people’s quality of life higher and higher, but also realizing people’s dream of flying to the sky in ancient times, out of the earth to explore the vast starry sky.
After human beings have the power of science and technology, they are naturally not reconciled to a small earth. At this time, we have greater ambitions, that is, the sea of stars. Mankind hopes that one day, we can become the overlord of the galaxy and the overlord of the universe.
When we step out of the earth and face the vast universe, we have to think about a question: that is the possibility of the existence of alien civilization. From the perspective of the vast universe and the 13.8 billion years of cosmic history, it is difficult to deny that alien civilization does not exist.
After a lot of observations, scientists believe that alien civilization exists and the universe should be very lively. As for the existence of alien civilizations, there are bound to be many unknown variables in the path of human dominance. Therefore, one of our very important tasks in exploring the universe is to explore possible alien civilizations.
Only by knowing more about alien civilization can our future road to dominate the starry sky more smoothly. Although the imagination is beautiful, the actual observations have surprised scientists. It turns out that the universe we see has no lively scenes, and there is loneliness everywhere. What is going on? Where did the alien civilization go?
The universe is so quiet, this situation is very unbelievable, scientists have long calculated through calculations, the number of habitable existence in the universe should be very large, so many that we can not count. Under the infinite base, there should be a lot of extraterrestrial civilizations in the universe, but why can’t we see any of them?
In this regard, scientists still do not believe that there is no alien civilization in the universe. The reason why we can’t find it is that our observation methods and capabilities are limited. So scientists started a great search for extraterrestrial civilization half a century ago. This plan uses various methods to find alien civilizations, such as launching Voyager 1 and Voyager 2.
Both of these spacecraft are carrying a golden compact disc, which records the coordinates of the earth and human information. The Voyager spacecraft is constantly advancing outside the solar system, hoping to be discovered by alien civilizations after leaving the solar system, so as to know the existence of the earth and humans, and come to the solar system to contact us.
In addition to launching interstellar spacecraft, scientists also search for signals of possible alien civilizations in the universe. If alien civilization, like human civilization, has also entered the age of science and technology and walked out of the home planet to explore the universe, then the extensive use of radio communications is inevitable. The transmission speed of wireless signals has reached the speed of light. If a powerful alien civilization in the universe also discovers the earth, it may take the initiative to send signals to the earth.
As long as we can search for such a signal, we can prove the existence of an alien civilization by cracking it, and determine where the opponent is based on the source of the signal. Searching for the mysterious signals of the universe is also one of the most anticipated successes for humans in searching for alien civilizations. Unfortunately, until now, there is still no discovery.
In addition to the above two methods, there is another way to search for extraterrestrial civilizations, which is to search for terrestrial planets in the Milky Way galaxy that are very similar to the Earth. Scientists believe that the earth’s ability to become a living planet and give birth to human beings is related to the earth’s natural high-quality ecological environment. And every high-quality ecological planet can be easily seen as long as it stands in space.
There are eight planets in the solar system. Putting them together for comparison, we can see from the outside that the earth is so dazzling and dazzling, exuding the light of sapphires. This is the unique demeanor of the planet of life, so other planets in the universe where civilization can be born will likely have the same beautiful and eye-catching appearance.
These terrestrial planets, which are very similar to the Earth, are undoubtedly much more likely to have life or even intelligent civilization. On March 7, 2009, NASA launched the Kepler Space Telescope. The function of this telescope is very powerful. Its search range is very wide and accurate, and its method of finding planets is also very unique.
The Kepler Space Telescope uses the transit method to search for planets. In simple terms, it uses the brightness changes produced by stars when planets and stars overlap to determine whether there are planets near the star, the size and shape of the planet, the distance to the star, and This method can be used to make preliminary judgments about the planet’s revolution and surrounding information.
During the nine years of operation of the Kepler telescope, thousands of star systems have been observed and many planets have been discovered, hundreds of which are terrestrial planets in habitable places. It can be seen that terrestrial planets are also very common in the universe. Some of these terrestrial planets are very similar to the earth, but they are also very dazzling and beautiful from the outside. Scientists speculate that they may be living planets.
Of course, what scientists expect most is the discovery of alien civilizations, but by looking for terrestrial planets through observations, we cannot be sure that there will be intelligent civilizations on a certain galaxy or a certain terrestrial planet. Originally, when scientists had no expectations for this method of searching for alien civilizations, a major discovery rekindled hope for scientists.
In the process of searching for the planet, the Kepler telescope discovered a special star, called “Tabby Star”, located in the constellation Cygnus, about 1,500 light years away. As we said earlier, Kepler searches stars through the brightness changes of stars. Under normal circumstances, even if dozens of planets gather around a star, its luminosity fluctuation range will not exceed 5%.
However, “Tabby Star” has repeatedly shown weird situations. Its luminosity has changed drastically many times, and the most powerful one has even dimmed by 22%. Such a situation has never occurred on other stars. What is going on? When this was first discovered, some scientists thought it might be caused by cosmic dust blocking stars.
But this conclusion was quickly rejected. If cosmic dust obscures the light emitted by Tabby star, then these cosmic dust will definitely heat up during the process of being irradiated by Tabby starlight, and it will be easily able to be able to be achieved in infrared observation instruments. I saw them, but I didn’t observe their existence in reality.
If it were not for these cosmic natural phenomena that caused the Tabby’s luminosity to be significantly weakened, then there may only be one result, and that is the guessed Dyson sphere. The famous physicist Freeman Dyson proposed the “Dyson Sphere” conjecture. He believed that when a civilization develops to the second stage, due to the huge demand for energy, the huge energy of stars needs to be fully utilized. To make better use of the energy of stars, a huge structure needs to be built to enclose the stars to absorb energy. This device is the Dyson sphere.
If a star is surrounded by a giant device such as the Dyson Sphere, it will naturally cause a very large change in the star’s brightness. Tabby’s star is exactly this unusual change in light. Scientists speculate that a second-level civilization may have appeared, located in the constellation Cygnus, about 1,500 light-years away from the earth.
If there is a second-level civilization in the Tabby Galaxy, is it happy or worrying for mankind? The distance of 1500 light-years is actually a very short distance on the cosmic scale. This distance cannot be crossed by human beings at present, because our civilization level is only 0.7, not even the first level civilization. But for a second-class civilization, it has mastered the technology of interstellar navigation, even if it has not mastered the technology of super-light-speed flight, then basic sub-light-speed flight can be done.
The distance of 1500 light-years can be achieved in thousands of years with sub-light-speed flight technology. Thousands of years may be considered a very long time in the short life span of human beings, but we must not forget that the power of science and technology is infinite, and human beings are constantly exploring genetic technology and have made some achievements in increasing longevity.
Then the second-level civilization naturally has more powerful life technology, and it is not unusual for the life span to increase to several thousand years. With the powerful technological strength of the second-class civilization and the distance of 1500 light, they might have discovered the existence of the earth. It is also speculated that the earth may be a smart and civilized planet.
If the dark forest law exists in the universe, it means that humans have already made a sound in this forest, and other hunters may be on their way to us. Perhaps in the near future, Tabby’s spacecraft will come to the solar system. Does alien civilization come to the solar system because it has nothing to do? Nature is not, it must have its purpose, is it for the earth as a resource planet or for humans? Is alien civilization friendly or malicious to humans?
All this is hard to say, so Hawking has repeatedly warned humans not to search for extraterrestrial civilizations, because before humans are truly powerful, actively exposing the existence of humans is actually a very unwise behavior, which may give the earth. And humanity bring a devastating crisis.