![]() ![]() : 27–28 : 6 He argued that if intelligent extraterrestrials exist, and are capable of space travel, then the galaxy could have been colonized in a time much less than that of the age of the Earth. Hart published a detailed examination of the paradox, one of the first to do so. In turn, Tsiolkovsky himself was not the first to discover the paradox, as shown by his reference to other people's reasons for not accepting the premise that extraterrestrial civilizations exist. Therefore, he proposed what is now known as the zoo hypothesis and speculated that mankind is not yet ready for higher beings to contact us. 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 An earlier implicit mention was by Konstantin Tsiolkovsky in an unpublished manuscript from 1933.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. However, there is no convincing evidence that this has happened.Since many of the Sun-like stars are billions of years older than the Sun, the Earth should have already been visited by extraterrestrial civilizations, or at least their probes. ![]()
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