This story was written for the "time travel" or "prophecy" issue of
Astounding Science Fiction. The issue was prompted by a letter from a reader (Richard A. Hoen of the University Club in Buffalo, New York) commenting on the stories in an issue, referring to the stories by author and title, and offering his respective praise and derision for those works. The magazine frequently received letters of this kind; however, in this case, the reader described an issue whose
cover date was more than a year in the future, November, 1949. Editor
John W. Campbell printed the letter in the November, 1948 issue, then set about making the predictions come true by arranging with the authors mentioned to write and submit stories with the given titles.
Gulf, by Anson MacDonald (a Heinlein pseudonym), was one of the stories involved. Heinlein has written that he had a different idea for the story originally, but decided that it was too large for a novella and could not be written in the time he had available. The idea later became one of the inspirations for his novel
Stranger in a Strange Land. For the magazine, he decided that the gulf between man and superman would provide an adequate basis for the title. Since Heinlein was no longer using the MacDonald pseudonym by the time the story was published, it was published under his own name. ==See also==