Extraterrestrial Civilizations is a 1979 book by Isaac Asimov, in which the author 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.
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.[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]
extraterrestrial, civilizations, this, article, about, book, real, life, concept, extraterrestrial, intelligence, 1979, book, isaac, asimov, which, author, estimates, probability, there, being, intelligent, extraterrestrial, civilizations, within, milky, galax. This article is about a book For the real life concept see Extraterrestrial intelligence Extraterrestrial Civilizations is a 1979 book by Isaac Asimov in which the author 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 Extraterrestrial CivilizationsHardcover editionAuthorIsaac AsimovCountryUnited StatesLanguageEnglishSubjectExtraterrestrial lifePublisherCrownPublication date1979Media typePrint Hardcover and Paperback Pages282ISBN978 0 517 53075 7OCLC4638134Dewey Decimal574 999LC ClassQB54 A84 1979Overview editThe 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 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 See also editDrake equationReferences edit J H Jenkins Review of Extraterrestrial Civilizations Archived from the original on April 5 2008 Retrieved 2008 04 05 a href Template Cite web html title Template Cite web cite web a CS1 maint bot original URL status unknown link The Internet Book Database of Fiction Extraterrestrial Civilizations nbsp This astrobiology related article is a stub You can help Wikipedia by expanding it vte nbsp This article about an astronomy related book is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Extraterrestrial Civilizations amp oldid 1200954489, wikipedia, wiki, book, books, library,
