Human smallness
When facing the vast universe, human beings realize how insignificant their own existence is. As people's understanding of the universe continues to deepen, and they have seen the vastness and vastness of the universe, they realize that even the solar system is as small as a grain of sand within the scope of the universe. It stands to reason that in such a large universe, it is obviously unlikely that only an intelligent civilization such as human beings has appeared. Most scientific researchers agree that alien civilizations actually exist, but because the distance between them is too far, humans have no way to truly observe their existence.
Whether intelligent civilization exists beyond light years
Humanity's current scientific and technological power is still unable to carry out interstellar travel, so it is impossible to go to the deepest part of the universe to find the existence of other life. In the same way, even if the alien civilization has a certain technological strength, it will be limited by distance and speed, and there is no way to go to other interstellar planets to find the existence of intelligent life. Perhaps only after the development of human science and technology breaks through the limit of the speed of light can we expand the scope of the search and find more possibilities.
Not currently possible
If you want to break through the speed of light in the true sense, there is no way to do it in a short time. Researchers put forward such a point of view that in the process of searching for alien civilizations, human beings can actually choose a passive way, that is, as long as alien life on other planets discovers the existence of human beings on Earth, let them take the initiative to come. Go to the earth and communicate with human beings. Researchers continue to send signals to the depths of the universe, in order to allow other intelligent civilizations to find the location of the earth in this way, so as to realize possible communication.
