[1][2] The American version of Double in Space was originally published in hardcover by Doubleday in 1951, and issued in paperback by Curtis Books in 1969.

The dust jacket for the Doubleday edition was illustrated by Richard Powers.

[1] It included two stories: "Project Excelsior" was originally published under the title "Asylum Satellite".

"[4] The UK version of Double in Space was published by T. V. Boardman in hardcover in 1954.

[2] It also included two stories: By the time of its inclusion in the UK version of Double in Space, "The Conditioned Captain" had already been expanded by Pratt into the separate novel The Undying Fire (1953).