Why do not we see aliens?

Scientists of the planetary mission New Horizons have put forward their scientific justification for the fact that people have not yet seen aliens. According to scientists, people just look wrong.

Scientist from the US Alan Stern (Alan Stern) gave an explanation of the invisibility of extraterrestrial life. According to the planetologist, people do not observe active life on other planets simply because living organisms do not exist on the surface of celestial bodies, but in its depths, for example, in oceans that are hidden under the outer crust of continuous planets. Therefore, such organisms can remain completely invisible outside and at the same time have all the necessary conditions for their development.

Thus, no matter how much humanity is peering into the surface of distant planets, it will never be able to see what is hidden in its interior. Using the upper solid shell of the planet as a powerful protection against solar radiation, organisms use hydrothermal sources as energy. At the same time, only in the solar system, potentially there are many planetoids, under the surface of which a huge amount of liquid water can hide. Moreover, some allow the possibility of the existence of developed species even under the surface of the Earth, completely isolated from humanity.

There are other interesting theories of why people do not see aliens. According to one of the versions, reasonable alien species reached the peak of their development and went into deep sleep. According to other versions, scientists, unable to adapt to the harsh conditions on their planets, many intelligent species could simply perish many thousands of years ago.

a source http://gamebomb.ru/gbnews/22196