Aliens are always a topic that will not be outdated. People are always keen to talk about aliens, such as: Where are aliens, and why have humans not discovered aliens so far?
Speaking of aliens, we have to mention the famous " Fermi Paradox ". This paradox is actually very simple, just a few words: Where are they?
Physicist Fermi once raised the question: the universe is so big, with trillions of stars and planets, with an evolutionary history of 13.8 billion years, and there is an alien civilization with a history of civilization of tens of thousands or even longer. The probability of analysis is very high, and it is very likely that there are not only one, but many.
Such a developed alien civilization has long dominated galaxies and even spread throughout the universe, but why is outer space so quiet?
Some people may think that the universe is too big even for highly developed alien civilizations. Even if their technology is developed enough, it will be difficult to accurately find the earth in the vast universe.
But perhaps this is not the case. We should broaden our rigid thinking style.
Imagine if a cosmic civilization wants to conquer Milky Way 4, and the diameter of the Milky Way reaches 200,000 light-years, what would they do?
method is very simple, very similar to the way humans conquer the earth. When humans conquer the earth, it is not done by one person, but by generations. Conquer one place first, then reproduce there, and then conquer other places.
The result is very similar to the spread of viruses. You will find that the speed is actually very fast. It will not take too long for a cosmic civilization to rule the entire galaxy.
Flying at the speed of light is not realistic, but it is still very likely to reach a speed of light of 1%. Even flying at 1% of the speed of light will take 20 million years to travel across the entire Milky Way.
20 million years seem to be very long, but compared with the 10 billion years of evolutionary history of the Milky Way, it is also very short.
As long as a cosmic civilization has a history of civilization of hundreds of millions of years (the possibility is still very high), then they will have enough time to conquer the entire galaxy. But why does the Milky Way look so quiet today? There is no alien at all?
There are many explanations for the Fermi paradox, one of which may make human beings desperate.
The explanation believes that the universe was actually occupied by a super civilization a long time ago, and they ruled the entire universe. Just as humans would consider building something like "nature reserves" and so on, super civilizations would do the same.
They regard planets like the Earth as "nature reserves", and of course there are many other similar planets. For us humans who are in the "nature reserve", it is difficult for us to have the opportunity to see the "master" with our own eyes, and super civilization has never considered communicating with humans.
Will humans consider communicating with animals in the "nature reserve" on the earth? Obviously not. Those animals also don’t know that they are in a “nature reserve” established by humans!
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