Tradition 20 of 33
UFOs, extraterrestrials, and contact
UFO/UAP reports, flying saucers, extraterrestrial life, alien contact or abduction, contactees, and ancient-astronaut claims.
Membership means relevance, not endorsement.
- Books
- 1,058
- Earliest
- 1558
- to 2026
- Read free
- 22%
- 236 with public full text
- With covers
- 58%
How books qualify
- Query + metadata match981
- Metadata match69
- Query match7
- Source classification (retained through merging)1
Every placement records its evidence — the controlled subject queries that found the book at its sources and the bibliographic metadata retained through merging. Each book page shows its own. How the rationale system works.
Key subjects
- Fiction324
- Science fiction258
- Extraterrestrial beings247
- Human-alien encounters220
- Unidentified flying objects204
- UFO128
- Alien abduction101
- Short Stories92
- Physical Sciences86
- Social Sciences83
- Astronomy and Astrophysics82
- Physics and Astronomy82
- Life on other planets81
- Children's fiction80
- Sightings and encounters79
- Space Science and Extraterrestrial Life78
- Fiction, science fiction, general77
- Juvenile fiction74
- History69
- Philosophy68
- Psychology68
- Extraterrestrial beings, fiction62
- Social Psychology52
- 未確認飛行物体46
Top languages
- English771 · 73%
- German85 · 8%
- Japanese48 · 5%
- French31 · 3%
- Dutch29 · 3%
Notable authors
All authors- Jacques Vallee14 in this tradition15 books
- Katherine Applegate12 books
- M. de Fontenelle11 in this tradition12 books
- Bernard Le Bovier de Fontenelle9 in this tradition15 books
- Virgil Finlay8 in this tradition12 books
- Ed Emshwiller7 in this tradition11 books
- George Adamski7 books
- Orson Scott Card6 in this tradition8 books
- Pittacus Lore6 in this tradition7 books
- Donald E. Keyhoe6 books
- Marissa Meyer6 books
- Robert A. Heinlein6 books
1,058 books
- Read free
Poema sopra la pluralità dei mondi
Gaspare Luigi Cassola
1774Italian
Alien Life Imagined
Mark Brake
2012
How prophecy lives
Diana G. Tumminia, William H. Swatos
2011
- Read free
Pluralité des mondes habités considérée au point de vue négatif
François Xavier Burque
1898French
UFO Reports
Timothy Jenkins
2024
- Read free
The Black Star Passes
John W. Campbell, Jerome Podwil
Date unknown
- Read free
The master mind of Mars
Edgar Rice Burroughs
Date unknown
- Read free
Islands of Space
John W. Campbell
Date unknown
- Read free
The Onslaught from Rigel
Fletcher Pratt
Date unknown
UFO
Garrett M. Graff
2023
- Read free
The colour out of space
Howard Phillips Lovecraft, J. M. de Aragon
Date unknown
- Read free
The silent invaders
Robert Silverberg, Ed Emshwiller
Date unknown
The Hynek UFO report
J. Allen Hynek
1977
- Read free
Silly asses
Isaac Asimov, Ed Emshwiller
Date unknown
- Read free
The Search for Extraterrestrial Intelligence
Jason T Wright
2026
Von der deutschen Flugscheibe zum Nazi-UFO
Gerhard Wiechmann
2022German
- Read free
Little Fuzzy
H. Beam Piper
1961
- Read free
Le peuple du Pôle
Charles Derennes
Date unknownFrench
- Read free
Maza of the Moon
Otis Adelbert Kline
Date unknown
Solar Express
L E Modesitt
2015
The gods of Eden
William Bramley
1989
The Mammoth Book of Ufos
Lynn Picknett
2001
三体
刘慈欣, Vincent Schmitt, Gwennaël Gaffric, Marc Simonetti
2008
Out of the Silent Planet
C. S. Lewis
1938