Scientists have been wondering for many years why it is so difficult to search for extraterrestrial life, possibly traces of which, according to astronomers, found in a very distant exoplanet.

An American team of scientists found in the atmosphere of the planet K2-18B, 124 years away from Earth, “the most promising to date” chemical traces of a possible life.

The results of their research, however, remain confirmed.

Our galaxy, one of the 170 billion galaxies throughout the universe, has been around for about 10 billion years and has more than 100 billion stars. It could therefore only host a dizzying number of potentially habitable planets.

“So where are all of them?” It was precisely the question posed by the natural Enrico Fermi in 1950, discussing with his colleagues, on the break for food, about the “absence of existence”.

According to the “Paradoxical Fermi”, having enough time at his disposal, “every extraterrestrial species should in the end acquire its own Elon Musk that would go to colonize the next star,” explained Jason Wright, director of the research center.

Based on a book published in 2015, at least 75 hypothetical solutions have been proposed in this paradox.

One of them says that humanity has not yet identified an alien life because it simply does not exist. Many scientists find it little likely: about 87% of those asked in a recent poll by Nature Astronomy scientific inspection believe that there is at least one simple form of extraterrestrial life. And over 67% believe that there are advanced cultures.

Another answer: It is possible that aliens are already here and not have noticed them or hide it.

It is probably very difficult to travel to the interstellar space, the distances are huge, the resources that are very large …

Another theory is that of the “big filter” that would prevent life from emerging or overcoming a stage of development. Whenever a culture acquires space travel technology, it tends to self -destruct or exhaust the natural resources of its planet.

Other theories are even more strange. For example, the theory of the “zoo” says that technologically advanced aliens have chosen to leave us quiet and watch us from afar. The theory of “Planetarius” says that aliens create an eye -catching, so we can see the space “vacuum”. A theory imagines the universe as a “dark forest” where everyone is hiding so as not to be destroyed.

But there is a problem with many of these supposed “solutions,” Wright. And this is because they start with the idea that all possible alien cultures would forever behave in the same way.