We can make a similar examination, but with greater uncertainty, of th…

Carl Sagan
415 citations
We can make a similar examination, but with greater uncertainty, of the extraterrestrial hypothesis that holds that a wide range of UFOs viewed on the planet Earth are space vehicles from planets of other stars. ✨ Carl Sagan (1973). Carl Sagan's Cosmic Connection: An Extraterrestrial Perspective, p.200, Cambridge University Press
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