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Welcome to the Encyclopedia of Science Fiction, Fourth Edition. Some sample entries appear below. Click here for the Introduction; here for the masthead; here for Acknowledgments; here for the FAQ; here for advice on citations. Find entries via the search box above (more details here) or browse the menu categories in the grey bar at the top of this page.

Site updated on 17 August 2022
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Northern Irish SF Magazine, Slick A4 format. Published bimonthly by Specifi Publications. Edited by Paul Campbell (?   -2021), with David Langford billed as nonfiction editor from #2. Three issues, dated February/March, April/May and July/August 1982. / During its brief slick-format existence Extro published fiction by Brian W Aldiss, Richard Cowper, Garry Kilworth, Christopher Priest, Bob Shaw, John T Sladek, Ian Watson, James White and others, along with interviews, essays ...


There is an only half-facetious precept in Physics stating that "anything which is not prohibited is compulsory". Olexa-Myron Bilaniuk and E C George Sudarshan suggested in 1962, and Gerald Feinberg in 1967, that the idea of a particle that can only travel Faster Than Light does not violate any of the basic maxims of Relativistic physics. Such a hypothetical particle (a tachyon, as opposed to the more familiar tardyon, or slower-than-light particle) might emit Cerenkov radiation analogous to ...

O'Brien, Sean

(?   -    ) US teacher and author who began to publish work of genre interest with "World Enough and Time" in The Leading Edge for February 1997. His first novel, A Muse of Fire (2010 ebook), follows the childhood of a potential Superman on the colony planet of Mnemosyne (see Colonization of Other Worlds). Vale of Stars (2012) is a Generation Starship tale set partly on the long voyage from Earth, and partly, in a narrative spanning generations, on Epsilon ...

Conspiracy X

Role Playing Game (1996). New Millenium. Designed by Rick Ernst, Shirley Madewell, Chris Pallace. / The game of Conspiracy X shares much with its rather more haunting contemporary Delta Green (1997) (see Call of Cthulhu). Player characters are agents for a secretive organization known as Aegis which defends present day America against paranormal threats, frequently of extraterrestrial origin. The most obvious influence is the television series The X-Files (1993-2002), though Conspiracy X is ...

Ackroyd, Peter

(1949-    ) UK author first active as a poet before turning to cultural studies like Dressing Up: Transvestism, Drugs and Literary Culture (1979), and only then to fiction, which as a whole can usefully, in the frame of this encyclopedia, be understood as a series of sometimes inspired exercises in Urban Fantasy [see The Encyclopedia of Fantasy under links below], with a recurring focus on London. Along lines initially promulgated in Lud Heat: A Book of the Dead Hamlets ...

Langford, David

(1953-    ) UK author, critic, editor, publisher and sf fan, in the latter capacity recipient of 21 Hugo awards for fan writing – some of the best of his several hundred pieces are assembled as Let's Hear It for the Deaf Man (coll 1992 chap US; much exp vt The Silence of the Langford 1996; exp 2015 ebook) as Dave Langford, edited by Ben Yalow – plus five Best Fanzine Hugos and one Semiprozine Hugo for his self-produced news magazine, Ansible (which see). His one ...

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