Science Fiction Adventures was an American digest-size science fiction magazine, published from 1952 to 1954 by Science Fiction Publications. It was edited by Lester del Rey, under the pseudonym "Philip St. John", and was targeted at a younger audience than its companion magazine, Space Science Fiction. Contributors included Algis Budrys, Raymond Z. Gallun, Robert Sheckley, and del Rey himself, who published his novel Police Your Planet under the pseudonym "Erik van Lhin". Damon Knight contributed a book review column beginning with the fifth issue. Cyril M. Kornbluth's novel The Syndic was serialized in 1954. Artwork was provided by H.R. van Dongen, Kelly Freas, and Paul Orban, among others.
There have been many attempts at defining science fiction. This is a list of definitions that have been offered by authors, editors, critics and fans over the years since science fiction became a genre. Definitions of related terms such as "science fantasy", "speculative fiction", and "fabulation" are included where they are intended as definitions of aspects of science fiction or because they illuminate related definitions—see e.g. Robert Scholes's definitions of "fabulation" and "structural fabulation" below. Some definitions of sub-types of science fiction are included, too; for example see David Ketterer's definition of "philosophically-oriented science fiction". In addition, some definitions are included that define, for example, a science fiction story, rather than science fiction itself, since these also illuminate an underlying definition of science fiction.
The Encyclopedia of Science Fiction, edited by John Clute and Peter Nicholls, contains an extensive discussion of the problem of definition, under the heading "Definitions of SF". The authors regard Darko Suvin's definition as having been most useful in catalysing academic debate, though they consider disagreements to be inevitable as science fiction is not homogeneous. Suvin's cited definition, dating from 1972, is: "a literary genre whose necessary and sufficient conditions are the presence and interaction of estrangement and cognition, and whose main formal device is an imaginative framework alternative to the author's empirical environment". The authors of the Encyclopedia article—Brian Stableford, Clute, and Nicholls—explain that, by "cognition", Suvin refers to the seeking of rational understanding, while his concept of estrangement is similar to the idea of alienation developed by Bertolt Brecht, that is, a means of making the subject matter recognizable while also seeming unfamiliar.
The order of the quotations is chronological; quotations without definite dates are listed last. The list below omits Hugo Gernsback's later redefining of the term "science fiction". According to anthologist, populist and historian of the genre Sam Moskowitz (1920–1997), Gernback's final words on the matter were: "Science fiction is a form of popular entertainment which contains elements of known, extrapolation of known or logical theoretical science". The list also omits John W. Campbell's infamous "Science fiction is what I say it is".Science Fiction Adventures
Science Fiction Adventures may refer to one of several science fiction magazines
Science Fiction Adventures (1952 magazine), an American magazine published between 1952 and 1954
Science Fiction Adventures (1956 magazine), an American magazine published between 1956 and 1958
Science Fiction Adventures (British magazine), a British magazine published between 1958 and 1963, initially as a reprint of the 1956 American magazine