Einstein’s theories and the nature of light.
The evolution of life on Earth and potential forms elsewhere. Carl Sagan Unser Kosmos (1982, 276 S , Text) pdf
Early human attempts to understand the stars. Einstein’s theories and the nature of light
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
Speculation on interstellar communication.
Comparison of Earth's atmosphere to the hostile conditions of Venus. Blues for a Red Planet: Humanity's fascination with Mars.
The book is organized into 13 chapters that correspond to the episodes of the original television series: