Perhaps representatives of extraterrestrial civilizations do not consider the Earth ready for contact
Astronomer Duncan Forgan, representing the University of St Andrews, presented his interpretation of the theory of the so-called "galactic club", according to which alien civilizations exist and even contact each other, but deliberately hide from earthlings. The specialist's calculations showed that the likelihood of the existence of such interplanetary communities is indeed quite high.
The theory of the "galactic club" or "galactic zoo" is one of the attempts to explain the Fermi paradox. This paradox was formulated by the famous physicist Enrico Fermi, and its essence lies in the fact that both the presence and absence of our brothers in mind in other stellar systems looks rather strange. On the one hand, the Universe and even each individual galaxy is so huge that the chances of the Earth being truly one of a kind do not look very high. On the other hand, if aliens do exist, then some of their civilizations may be older than earthly ones, which means that we must observe certain traces of their activity.
In the mid-70s of the last century, astrophysicist Ronald Bracewell proposed his own "solution" to the Fermi paradox. Its essence lies in the fact that extraterrestrial civilizations do exist, and the most advanced of them even contact each other. However, the Earth, according to this theory, is on the “black list” of such a “club”, since its inhabitants are unworthy or simply not ready to join it. In this regard, the aliens deliberately mask their signals so that the earthlings do not learn about their space neighbors ahead of time.
Although this assumption looks like a rather fantastic conspiracy theory on a cosmic scale, Duncan Forgan decided to test it by compiling a computer model for this purpose. According to the scientist, as a result, he came to the conclusion that the existence of such "closed clubs" is quite probable. However, a community of this kind can hardly cover our entire galaxy - for this, new civilizations must appear in it very often by cosmic standards and exist for millions of years. However, small coalitions of aliens may well form even if intelligent life on the participating planets was formed only 250 thousand years ago (on Earth, 190 thousand years have passed since that moment. Thus, it is possible that the earth is in the "reach zone" more than one "galactic club", but they have all avoided contact so far.
The astronomer emphasizes that his calculations cannot be considered proof of the presence of aliens on the territory of the Milky Way, and even more so of collusion between them. Nevertheless, according to the expert, they can serve as an argument in favor of the theory of the "galactic zoo" has a right to exist.
Dmitry Istrov