What Is This Thing Called Love?
| First published | November 1966 |
|---|---|
| Type | Short Fiction |
| Length | Short Story |
An alien surreptitiously observing Earth becomes concerned about the evolutionary potential of sexual reproduction, but its superior officer is skeptical about such a thing existing.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| November 1966 |
|
Science Fiction Oddities | Berkley Medallion | Anthology | 16 |
| 1969 |
|
Nightfall and Other Stories | Doubleday | Collection | |17 |
| June 1969 | Science Fiction Oddities | Rapp & Whiting | Anthology | 19 | |
| December 1969 |
|
Nightfall and Other Stories | Doubleday / SFBC | Collection | 308 |
| June 1970 |
|
Nightfall and Other Stories | Rapp & Whiting | Collection | |17 |
| November 1970 |
|
Nightfall and Other Stories | Fawcett Crest | Collection | 314 |
| October 1971 |
|
Nightfall Two | Panther / Granada | Collection | 155 |
| 1972 |
|
Nightfall Two | Panther | Collection | 155 |
| 1973 |
|
Nightfall Two | Panther | Collection | 155 |
| 1976 |
|
Nightfall Two | Panther / Granada | Collection | 155 |
| 1976 |
|
Nightfall Two | Panther | Collection | 155 |
| July 1977 |
|
Nightfall and Other Stories | Fawcett Crest | Collection | 314 |
| 1978 | Nightfall Two | Panther / Granada | Collection | 155 | |
| September 1979 |
|
Sex in the 21st Century | Panther / Granada | Anthology | 92 |
| 1981 |
|
Nightfall Two | Panther / Granada | Collection | 155 |
| May 1982 |
|
Flying Saucers | Fawcett Crest | Anthology | 17 |
| March 1983 | Flying Saucers | Fawcett Crest / Ballantine | Anthology | 17 | |
| December 1984 |
|
Nightfall and Other Stories | Del Rey / Ballantine | Collection | 314 |
| 1985 |
|
Nightfall Two | Panther / Granada | Collection | 155 |
| July 1985 |
|
Amazing Stories: 60 Years of the Best Science Fiction | TSR | Anthology | 93 |
| August 1987 |
|
Flying Saucers | Fawcett Crest / Ballantine | Anthology | 17 |
| November 1990 |
|
The Complete Stories, Volume 1 | Doubleday Foundation | Collection | 582 |
| November 1990 |
|
The Complete Stories, Volume 1 | Doubleday Foundation | Collection | 582 |
| March 1991 |
|
The Complete Stories, Volume 1 | Doubleday Foundation / SFBC | Collection | 582 |
| July 1991 |
|
The Great SF Stories #23 (1961) | DAW Books | Anthology | 154 |
| July 1991 |
|
Nightfall and Other Stories | Grafton / HarperCollinsPublishers | Collection | 401 |
| July 1991 |
|
The Great SF Stories #23 (1961) | DAW Books | Anthology | 154 |
| March 1993 |
|
The Complete Stories, Volume 1 | HarperCollins (UK) | Collection | |
| January 1995 |
|
The Complete Stories: Volume Two | HarperCollins (UK) | Collection | 415 |
| June 1996 |
|
UFOs: The Greatest Stories | MJF Books | Anthology | 97 |
| 1997 |
|
The Complete Stories: Volume Two | Voyager | Collection | 415 |
| July 2021 |
|
Nightfall and Other Stories | Del Rey | Collection | 337 |
| November 2023 |
|
The Complete Stories: Volume Two | Harper Voyager (UK) | Collection | |415 |
| November 2024 |
|
Nightfall: And Other Stories | Harper Voyager (UK) | Collection | 387 |