Fermi paradox
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The Fermi paradox is the seeming inconsistency between the lack of evidence of extraterrestrial civilizations and the apparently high likelihood of their existence.
Russian rocket scientist Konstantin Tsiolkovsky
Carl Sagan, seen here beside a Viking lander mockup, first mentioned the paradox in print.
Enrico Fermi (1901–1954)
Radio telescopes are often used by SETI projects.
Carl Sagan
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Carl Edward Sagan was an American astronomer, planetary scientist and science communicator. Initially an assistant professor at Harvard, Sagan later moved to Cornell, where he was the David Duncan Pro
Fermi paradox
…This happened at Los Alamos in 1950 with colleagues Konopinski, Edward Teller, and Herbert York. The paradox first appeared in print in a 1963 paper by Carl Sagan, and the paradox has since been more fully described by scientists. Early formulations of the paradox have also been identified in writings by Bernard…
Sagan in 1980
Sagan (age 16) in the 1951 Rahway High School yearbook
Sagan in the University of Chicago's 1954 yearbook