query: When was the Fermi paradox created?
passage: Fermi paradox
Although Fermi's name is most commonly associated with the paradox, he was not the first to ask the question. An earlier implicit mention was by Konstantin Tsiolkovsky in an unpublished manuscript from 1933.[23] He noted "people deny the presence of intelligent beings on the planets of the universe" because "(i) if such beings exist they would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 ETs, but it was for him, since he himself was a strong believer in extraterrestrial life and the possibility of space travel. 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.[24] That Tsiolkovsky himself may not have been the first to discover the paradox is suggested by his above-mentioned reference to other people's reasons for denying the existence of extraterrestrial civilizations.
passage: Fermi paradox
If human-capability constructs in a machine such as mind uploading are possible, and it is possible to transfer such constructs over vast distances and rebuild on a remote machine, then it might not make a strong economic sense to travel the galaxy by spaceflight. After the first civilization have physically explored or colonized the galaxy, as well as sent such machines for easy explorations, then the subsequent civilizations, after having contacted the first, may find it cheaper, faster, and easier to explore the galaxy through intelligent construct transfers to the machines built by the first civilization, which is cheaper than spaceflight by a factor of 108-1017. However, since a star system needs only one such remote machine, and the communication is most likely highly directed, transmitted at high-frequencies and at a minimal power to be economical, such signals would be hard to detect from earth.[93]