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Speculation on interstellar communication.
A major focus is the magnitude of the universe and the mathematical probability of extraterrestrial civilizations, balanced against the lack of physical evidence for visits to Earth. Carl Sagan Unser Kosmos (1982, 276 S , Text) pdf
Droemer Knaur (German title: Unser Kosmos: Eine Reise durch das Weltall ). Speculation on interstellar communication
The book is organized into 13 chapters that correspond to the episodes of the original television series: Carl Sagan Unser Kosmos (1982, 276 S , Text) pdf