First published in 1941, this novelette was a sequel to "Universe". The two were published together in 1963 as "Orphans of the Sky", a fixup novel.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| October 2005 |
|
Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein | Science Fiction Book Club | Collection | 175 |
| February 2010 |
|
The Future History of Robert Heinlein: Volume II | The Virginia Edition | Collection | 463 |
| February 2014 |
|
The Past Through Tomorrow | Gollancz / Orion | Collection | 737 |
| March 2014 |
|
The Past Through Tomorrow | Gateway / Orion | Collection | |737 |