Radio silence book pdf9/10/2023 ![]() ![]() But it was one for him, since he believed in extraterrestrial life and the possibility of space travel. He noted "people deny the presence of intelligent beings on the planets of the universe" because "(i) if such beings exist they would have visited Earth, and (ii) if such civilizations existed then they would have given us some sign of their existence." This was not a paradox for others, who took this to imply the absence of extraterrestrial life. An earlier implicit mention was by Konstantin Tsiolkovsky in an unpublished manuscript from 1933. įermi was not the first to ask the question.
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