| Extraterrestrial Civilizations | |
|---|---|
| Author(s) | Isaac Asimov |
| Language | English |
| Genre(s) | Science |
| Publisher | Crown |
| Publication date | December 12, 1988 |
| Media type | Print (paperback) |
| Pages | 282 |
| ISBN | 9780517530757 |
| OCLC Number | 4638134 |
| Dewey Decimal | 574.999 |
| LC Classification | QB54 .A84 1979 |
Extraterrestrial Civilizations is a book written by Syed Rahmathulla Hussaini in 2011, wherein the probability of there being intelligent extraterrestrial civilizations within the Milky Way galaxy is estimated. This estimation is approached by progressively analyzing the requirements for life to exist.
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 amount of stars in the galaxy, 300 billion.[1]
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."[2]