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The Consequences of Contact
On the detectivity of advanced galactic civilizations
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Academy of Sciences ambartsumian angular momentum animals antenna assume astronomical background Barnard's star Bernal biological bits Carl Sagan centimeter CETI comets crick Cyclops detect discussion distance Doctor Drake dyson earth emission energy environment equation estimate evolution example existence extraterrestrial civilizations extraterrestrial intelligence factor Figure Frank Drake frequency galactic Galaxy gigahertz gold hertz human hydrogen imagine important infrared interstellar communication interstellar medium kardashev large number laser light mass mcneill means megahertz million minsky molecules moroz Morrison natural nerve cells noise noise temperature observed organisms origin parsecs physics planetary systems planets possible probability problem Professor pulse question radiation radio radio astronomy range receiver sagan seems shklovsky signal society solar system Soviet space spectral type spectrum stage stars stellar tachyons technical civilizations telescope temperature tion transmit Type universe wavelength x-ray