Do aliens exist ? What exactly are they like? What behavioral characteristics do they have? How do they live on earth? How did they survive? These are topics that people are very concerned about. Do they have the same physical composition as humans ? where do they live now ? The question of extraterrestrial life is one of the biggest and most interesting mysteries in human exploration of the universe .

This mystery also continues to haunt humanity, leaving us wondering why we haven't discovered aliens and why they haven't visited Earth .

This is the gist of the famous Fermi Paradox , so what is a paradox ? How does it relate to philosophy of science? What is the relationship between paradox and truth? This article will elaborate on mathematics, logic, physics, and philosophy. 1. Paradox: Conceptual contradiction. A paradox is a situation where a correct theory produces results that are contrary to the facts.

From all the existing scientific theories, we can infer the following conclusions:

Alien life, even intelligent alien life, they are ubiquitous in the universe , even in the Milky Way , they are far more technologically advanced than human beings , are able to travel between stars, and have conquered the entire galaxy .

So we should be surrounded by aliens . But what about the facts? Are there really aliens on Earth? Can we see the traces of alien life again? The question "who are the aliens" has been debated in the scientific community. Scientists have also tried to crack these mysteries. But still no conclusion. Not only have we not seen aliens, we haven't even found any evidence of their existence.

Why do our theories tell us that the Milky Way is full of aliens ? Because under what circumstances did they appear? If aliens really exist, how big are they? How can we survive if there are no aliens on our planet? Are they more advanced than us?

First , if we admit that our current scientific theories apply to all parts of the universe , it's not hard to see that our sun is just an ordinary G-class star in the Milky Way .

The Milky Way has about 400 billion stars, of which stars like the sun make up about 8 percent, or tens of billions.

Based on our research and discoveries of exoplanets in recent years, NASA released a statement saying that among Sun-like stars, a more pessimistic estimate is that at least 7% of stars have a habitable planet like Earth.

More optimistically, this could be as high as 75 percent, meaning there are 2.2 billion to 24 billion habitable planets in the Milky Way alone, and its parent star is a Sun-like star.

In addition to habitable environments, we have found all the elements necessary for life in the universe, and even complex organic chemical molecules, in the interstellar medium, the gas clouds that stars form, the gaseous remnants that explode after stars die.

These findings make it hard to believe that there are only humans in the universe, and that there are planets around other types of stars besides sun-like stars, including habitable terrestrial-like planets.

So, in theory, aliens are everywhere.

The next question is, why are the aliens ahead of us?

The reason is very simple, that is, human beings came too late, only four or five million years ago, like blinking an eye to the universe.

Not only humans, the Earth and even the solar system are relatively new, the Earth is only 4.5 billion years old, a third of the age of the universe.

The reason why the solar system is late is that it is located outside the third ring or suburb of the Milky Way, about 25,000 light-years from the center of the Milky Way, and the density of matter and gravitational activity is relatively weak, so the rate of star formation is slower, and the stars formed are less massive and lasting for a long time. longer, so the rate at which the interstellar medium is enriched with heavy elements is slower.

The closer we get to the center of the Milky Way, the more different it is, the original matter is denser and gravitationally fluctuating, so stars form fast, are massive, and have short lives that can die quickly and produce the next generation of stars.

So in the center of the Milky Way, second-generation (and possibly third-generation) stars like the sun appear faster and in greater numbers, and of course rocky planets like Earth appear earlier and in greater numbers .

If life arose on them, it would have evolved hundreds of millions of years before Earth. Their ancestors may have been among the oldest intelligent creatures in the universe, but they are now living like humans. These extraterrestrial intelligences are likely to think and make judgments like humans. So we believe that aliens are just more advanced than us and have the ability to colonize the entire galaxy.

So here comes the question? Do aliens really exist? This question is important. If our theories are wrong, then we can't have a real universe; conversely, if our theories are right, we can hope to find alien life. If our speculation is correct, why haven't we found aliens yet?

The explanation for this problem is actually an explanation of the Fermi paradox, which includes some theories:

life is rare says:

Maybe we always overestimate the birth of life, the probability of life happening is very low, to an alarming degree;

Although the universe is full of life-bearing building blocks, and it is habitable planets that breed life, there is still very little life in the Milky Way because the occurrence of life is a very random, ultra-low-probability event.

Even if there is life, they are even less likely to evolve intelligent life like humans, that is, we humans are only a miracle of miracles, and we can't expect miracles to happen elsewhere in the universe.

dark forest theory

This is what we all hear, there are intelligent creatures in the universe, there are many, but they hide themselves from other civilizations.

Like lone hunters roaming a dark forest, if they reveal their presence and location, they will be wiped out by other civilizations.

The Limits of the Universal Law

Granted, intelligent life is universal, but the vastness of the universe makes it difficult to bridge the gap between intelligent life and all life, which is always confined to its own constant star system.

No one can find anyone, just like humans are now trapped in the solar system, trying to fly out of events for at least 30,000 years, and fly to the nearest star, Proxima, for at least 70,000 years, which is an invisible cage for humans.

large filter

The reason why intelligent life develops to a certain extent is because the resources are exhausted, the living environment deteriorates, the technology reaches a certain bottleneck, and eventually leads to demise, or the technological civilization itself is destructive, and the war between human beings in the future will lead to civilization due to energy competition. 's demise.

It's very possible indeed, and when we look at human development, it's not hard to see the predicament we're in. From agricultural civilization to industrial civilization to the information society, in each era, human beings are constantly changing themselves to adapt to this changing world, and each era will produce different problems. The development of human science and technology has only a few hundred years, but the environment of the earth has begun to deteriorate, and protecting the environment can only slow down this process.

In addition to environmental problems, there are also resource problems. The resources on the earth will be depleted, so in any case, we humans need to find a second home, but where is this home? Can we find it out? This has to first understand the earth's magnetic field! There is a large layer of magnetite on the Earth's surface. I do not know yet.

The development of civilization will always face various problems. Without the solution of certain problems and technological breakthroughs, civilization will surely die out.

So what do you think is the reason we haven't discovered alien life?

Scientists recently published a paper on arxiv supporting the last big filter.

Single-celled life did not emerge until about 1 billion years after Earth was born, and if intelligent life emerged in a similar fashion, it would take more than 3 billion years for human evolution, the researchers say.

Therefore, the earliest intelligent life in the Milky Way was 8 billion years after the birth of the Milky Way, and about 8.5 billion years after the birth of the universe, and they were mainly concentrated in the area around the center of the Milky Way, 13,000 light-years away from the Milky Way.

It can be seen that the earliest alien intelligent life appeared nearly 5 billion years before human beings, or when the solar system was a cloud of dust, the Milky Way evolved advanced intelligent life.

For 5 billion years, intelligent life blossomed across the galaxy, but eventually they all died out for various reasons. Why is this happening? This is an interesting and complex question, and one that scientists have been trying to solve. We know that there are two main reasons for the birth of the solar system: one is the sun; the other is humans on earth. These include possible factors such as resource depletion, war, technological bottlenecks and the death of the parent star.

So, when humans came along, the galaxy had become very quiet, and it was full of extinct aliens, so we didn't find any advanced intelligent life, and they didn't visit us.

And the intelligent life that may exist in the Milky Way now, after going extinct again and again, may still be at a stage of development comparable to human technology, so they cannot connect with each other.

If these predictions are correct, humans may become so technologically advanced that they may not be able to escape the "Great Filter" and eventually go extinct.

As intelligent life continues to evolve in the galaxy, they also wonder why no higher life is visiting them.

Eventually they will find out that the original higher life has finally died out, and they will end up in the same way. This is a brutal process. The war between humans and aliens has never stopped, and in the universe, they have never left the earth. We can never survive on this planet. This is the law of destiny! Life goes on like this, no one can find anyone anyway, no one can complete interstellar travel, no one can even colonize entire galaxies.