8 /10 1 Votes8
Country United States Publisher Crown Pages 282 | 4/5 Goodreads Language English Publication date 1979 Originally published 1979 Page count 282 OCLC 4638134 | |||||||||||||||||||||||||||||||||
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Book review extraterrestrial civilizations
Extraterrestrial Civilizations is a 1979 book by Isaac Asimov, in which Asimov estimates the probability of there being intelligent extraterrestrial civilizations within the Milky Way galaxy. This estimation is approached by progressively analyzing the requirements for life to exist.
Contents
Overview
The term "Earth-like world" is prominent, in that the assumption is made that any world where life could evolve would have certain similarities to Earth, such as temperature ranges and gravity sufficient for an atmosphere to exist. Asimov begins with the estimated number of stars in the galaxy, 300 billion.
This number is then reduced to 280 billion as stars without planetary systems are discarded, and then furthermore reduced as more factors are taken into consideration. This process culminates in the statement that "the number of planets in our galaxy on which a technological civilization is now in being is roughly 530,000."