An intelligent interstellar ship containing two immortal humanoid aliens crashes on earth 1200 years ago and retains just enough energy to conceal itself; a broadcast power station coming online activates the ship, and brings the deadly rivalry which has built up between the two aliens to a head.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1969 |
|
Galaxy Magazine, March 1969 | Galaxy Publishing Corporation | MAGAZINE | 7 |
| April 1969 |
|
Galaxy Magazine, April 1969 | Galaxy Publishing Corporation | MAGAZINE | 133 |
| May 1969 |
|
Galaxy Magazine, May 1969 | Galaxy Publishing Corporation | MAGAZINE | 144 |
| September 1969 |
|
The Long Twilight | G. P. Putnam's Sons | Novel | |
| May 1970 |
|
The Long Twilight | Berkley Medallion | Novel | 7 |
| October 1972 |
|
Duell der Unsterblichen | Pabel | Novel | |
| 1975 |
|
Duizend jaar schemering | Meulenhoff | Omnibus | 179 |
| May 1976 |
|
The Long Twilight | Robert Hale | Novel | |
| November 1976 |
|
The Long Twilight | Berkley Medallion | Novel | 7 |
| January 1978 |
|
Le long crépuscule | Albin Michel | Novel | 9 |
| September 1982 |
|
The Long Twilight | Berkley Books | Novel | 5 |
| January 1986 |
|
The Long Twilight | Ace Books | Novel | 7 |
| February 1987 |
|
Duizend jaar schemering | Meulenhoff | Novel | 5 |
| February 2007 |
|
The Long Twilight and Other Stories | Baen Books | Collection | 1 |
| February 2007 |
|
The Long Twilight and Other Stories | Baen Books | Collection | |1 |
| September 2008 |
|
The Long Twilight and Other Stories | Baen Books | Collection | 1 |
| February 2016 |
|
The Long Twilight | Gateway / Orion | Novel |