X Stands for Unknown

'X' Stands for Unknown is a collection of seventeen nonfiction science essays written by Isaac Asimov. It was the seventeenth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction, these being first published between January 1982 and May 1983. It was first published by Doubleday & Company in 1984.

'X' Stands for Unknown
First edition
AuthorIsaac Asimov
CountryUnited States
LanguageEnglish
SeriesFantasy & Science Fiction essays
Genrescience essay
Published1984 (Doubleday)
Media typeprint (Hardback and Paperback)
Pages218
ISBN0-385-18915-X
Preceded byCounting the Eons 
Followed byThe Subatomic Monster 
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