Just over 80 years ago, humanity first began broadcasting radio and television signals with sufficient force to leave the Earth's atmosphere and move deeper into the interstellar space. If someone living in a distant star system is vigilantly watching these signals, he will not only be able to catch them, but also immediately identifies their sender as a reasonable species.
In the end, if someone from a society in which they communicate with the signals of drums and fires, finds himself deep in the forest, he can come to the conclusion that there is no intelligent life around. But give him a phone and he can contact his relatives. Our conclusions can be as biased as the methods that we apply.
In other words, to draw conclusions about what is and what is not, according to the specific form of the electromagnetic signal, is a completely erroneous strategy.
If we looked at the Earth from a close distance in visible light, we would undoubtedly decide that it is inhabited: the glow of cities at night is an unmistakable sign of activity. But such light pollution is a relatively new phenomenon.
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