The Fermi Paradox is an idea about extraterrestrial civilization proposed by the famous American physicist Fermi, and once he asked a colleague during a discussion, where are the aliens? It has sparked discussions from all walks of life and has become the Fermi Paradox.
We can currently observe that the universe has about 7 times 10 of 22 square stars, even if the emergence of intelligent life is a small probability event, in the face of such a large order of magnitude, will also produce a large number of intelligent life and civilization, in the Milky Way there are more than 250 billion stars, should produce more than 100,000 civilizations, so why don't we see any?
The first possibility is that human beings and the earth are really too special, and there is really only one kind of life in the universe. However, this statement is not agreed with by the mainstream theory, because the earth and other planets, humans and other animals are essentially no different.
The second possibility is that other planets also have life, but they are not intelligent, similar to other animals or plants on our earth, and we humans are the most developed civilizations in the universe at present, and can only wait for us to discover them.
The third possibility is that extraterrestrial intelligent life does exist and has come to Earth, but that was a long time ago, and it can also explain that we have some ancient miracle buildings and other issues.
The fourth possibility is that extraterrestrial life is all around us, but he thinks we are inferior beings, and they neither despise us nor can we understand them.
The fifth possibility is that there are indeed a large number of civilizations in the universe, but the "dark forest law" also exists, and they are hidden in order to protect themselves, so we can't see them.
The sixth possibility is that we exist in different forms, that we are physical beings, that they may be light or consciousness, or that we cannot know the existence of forms
The seventh possibility is that our communication methods are completely different, we have always thought that aliens will also use radio to communicate, they may use other ways that we can't understand, such as quantum entanglement, we are not on the same channel, so we can't talk together.
The eighth possibility is that an alien civilization exists and is also on Earth, but only some Earthlings know, such as the heads of state, who may be afraid of causing panic or may have reached a certain agreement.
The ninth possibility is that our earth is a prison, we are the descendants of the criminals of the universe, and higher beings are watching us, so they do not have contact with us.
The tenth possibility is that the existence of extraterrestrial civilizations also knows our existence, but because of some treaties in the universe, it cannot change our development or interfere with us, so it cannot contact us.
The eleventh possibility is that the Earth is actually a testing ground, and we are created, constantly iterating, to see if we can reach their level, or to see how we can reach their level.
The twelfth possibility is that our dimensions are different, we are three-dimensional or four-dimensional spaces, they are in a higher dimension, and neither of us can perceive each other's existence.
The thirteenth possibility is that alien civilizations may live in the underground world, and the surface of the planet we live on is the strangest in their eyes, because the risk is greater on the surface, and it is safer underground.
The last possibility is that our world is what we now call the metaverse, everything is virtual, we are just a character existence, the universe is only the creator's setting, so we can never understand the truth of the universe, the universe is just a background, this background can change with a code, our life is infinite, so we enter into a physical body to experience, so we can't find other life, because the other is just NPCs.
This is the explanation that I can think of in Fermi's paradox, and I believe that one day we will really understand what our world really is like, where the alien civilizations really are.