Why has the Earth not been invaded by aliens? Is it because aliens have not discovered the existence of Earth civilization? Or are there no aliens in the universe?
In many science fiction movies, there are often scenes of aliens invading the earth, and the purpose of the invasion is very single, usually to eliminate or enslave humans and occupy resources on the earth, such as seizing water resources or other ore resources.
This kind of idea is really low-level and has no logic at all! To be honest, the earth is not worthy of aliens' invasion from thousands of miles away.
If there are really alien civilizations in the universe and they still have the ability to reach the earth from thousands of miles away, this level of technology is definitely not something we can imagine at the moment. According to the civilization level proposed by Kardashev, this civilization's energy utilization level reaches at least a stellar rating. The alien civilizations that can conduct interstellar navigation have far more demands for resources and energy than humans on Earth. They also do not look down on these resources on Earth at all, let alone enslave humans.
Technology developed, and it will inevitably be able to develop advanced artificial intelligence , which is what we often call robots. Using these advanced robots to produce labour , why should we enslave humans?
and it is nonsense to occupy resources on the earth. There are too many planets in the universe, and the resources are very rich. They come from thousands of miles away. It is not cost-effective to just make this little resource on the earth. Take water resources as an example, the water resources on Muo far exceed those on Earth.
Alien civilization has come from thousands of miles away, and it is possible to build a stronghold on the earth. As for whether it will become an enemy of mankind, it is hard to say! But it can be clear that we cannot think of alien civilizations too friendly, after all, morality and technology are not proportional.
Are there aliens in the universe?
Human beings are still in their early stages of exploration of the solar system, and no traces of life exist outside the earth.
1960, Frank Drake proposed a formula for calculating the number of intelligent life in Milky Way , which is called the Drake equation. The idea of this equation is very good, but the exact solution of this equation is difficult to solve because there are too many unknown quantities and fuzzy quantities involved.
However, the universe is too vast, and it has a history of 13.8 billion years since its birth. There are hundreds of billions of stars in the Milky Way alone. It is certain that life must exist on the planets in the Milky Way and other galaxies in the Universe. The probability is very small, not to mention the development of a smart civilization with a technological level far exceeding that of humans.
Life like humans is called intelligent life. The public always likes to call intelligent life outside the earth aliens. In fact, alien life should have a great difference in form from the life on Earth. Even if there are alien intelligent life, it is very likely that there is a great difference from humans.
How many places where life exists can evolve into intelligent life like humans? This is really difficult to estimate, because the laws of life development on Earth should not be completely applicable to alien life.
Is it possible for the Earth to be discovered by aliens?
Scientists attempt to contact and discover aliens through radio, but the results are not optimistic. Humans have neither discovered alien intelligent life nor discovered alien life.
However, this does not mean that there is no alien intelligent life in the universe.
The earth is already 4.6 billion years old, life was born about 3 billion years ago, while human beings were born about millions of years ago. It only took ten thousand years to enter the civilization era, and only master radio communications for more than 100 years.
If there is really an alien intelligent life in the universe with much higher technological level than human civilization, then maybe the earth has been discovered by them and they have visited the earth, but we don’t know yet. Alien civilizations may know that there is life on Earth, but they may not know that the higher civilization of human beings has evolved on Earth.
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