This article relies largely or entirely on a single source. (November 2020) |
Author | Isaac Asimov |
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Language | English |
Series | Fantasy & Science Fiction essays |
Genre | science essay |
Published | 1984 (Doubleday) |
Publication place | United States |
Media type | print (Hardback and Paperback) |
Pages | 218 |
ISBN | 0-385-18915-X |
Preceded by | Counting the Eons |
Followed by | The Subatomic Monster |
'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.