About the book: year / First of all, the question of classification arises. There are about a billion star systems in our galaxy, and each of them is fraught with civilization. The number of forms of intelligent life today can hardly be counted. It is not possible to cover all their diversity, but no one is stopping anyone from striving for this. This work is openly compilative in nature and far from exhausting the given topic; this is not his task. Perhaps the size of one human life will not be enough to exhaust it, but even if I’m wrong, and the size of one human life turns out to be just right, I’m still not ready to devote all of it without a trace to solving this one, albeit important, problem. Alien life is so diverse that it is very easy to lose your.