The main enemies of mankind, capable of completely exterminating our race, may be microbes that have arrived from space.
Worse than reptilians
Science fiction writers over the years have perfectly prepared us for an encounter with alien intelligence. Their work showed us a lot of the most diverse options for the first and subsequent contacts - from peaceful and friendly coexistence with aliens and mutually beneficial exchange of knowledge, to complete rejection, interstellar wars and struggle up to complete destruction.
Having told us about possible interplanetary contacts and conflicts, the writers did not miss the opportunity to show us the alleged appearance of guests from space. So we will be very surprised if we suddenly see that visitors from other planets do not have a large skull, huge eyes and green skin at all.
But, unfortunately, imagining an alien mind in the form of octopuses, reptilians and other exotic creatures traveling on ships of their own construction and destroying all life with superpowerful lasers, science fiction writers kept silent about one very important thing - when meeting with space guests, we … may not have them at all notice! For the very simple reason that the main enemies of humanity, the most brutal killers capable of completely exterminating our race, may not be some reptilians there, but the most ordinary microbes. More precisely, not quite ordinary, but unknown to us, arriving from other planets or even from other stellar systems.
The ocean is the source of not only earthly life
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Scientists say that in the bowels of Europa, the moon of Jupiter, there is a salty ocean, where microorganisms unknown to us can easily inhabit. More and more researchers are inclined to believe that the surface of Mars was also partly covered by the ocean a long time ago. The fact that there is no open water on Mars now does not mean that there is no water at all - who knows what is hidden under the surface of the Red Planet?
And now let's imagine that somewhere out there, in suspended animation, microbes quietly exist for themselves, posing a serious danger to all mankind. Microorganisms capable of causing mass extinction of people from diseases unknown to science, it is only necessary for them, these organisms, to penetrate our Earth.
In fact, it is not as difficult for uninvited guests to get to our planet as it seems at first glance, for example, when sampling soil or when landing colonists on the same planet Mars. Whatever climate the invisible enemy is used to in his own environment, he may well survive in the almost ideal conditions of a spacecraft. In any case, until the ship itself undergoes special treatment. But again, how do we know that the special treatment we have invented, which is fatal to the microbes we know, will not turn out to be a "rain of paradise" for alien organisms? And it remains a mystery how exactly these organisms can affect the human race? Will we not turn into mutants ourselves, ready to exterminate our own kind, or, conversely, quickly and imperceptibly die out, having lost all will to live,until the very end without understanding - what is happening to us?
Igor Nikitin