The Foundation Series is an epic science fiction series written by Isaac Asimov over the span of forty-nine years. It consists of ten volumes (about one-million words), which, although they can be read separately, are closely linked to one another. The term 'Foundation Series' is often used more generally to include the Robot Series and Empire Series, which are set in the same fictional universe. They have a combined length of fourteen novels and dozens of short stories written by Asimov, and six novels written by other authors after his death.
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The premise of the series is that mathematician Hari Seldon has spent his life developing a branch of mathematics known as psychohistory, a concept devised by Asimov and his editor John W. Campbell. It uses the law of mass action to predict the future on a large scale, such as of planets or empires. Using these techniques, Seldon foresees the fall of the Galactic Empire, which encompasses the entire Milky Way. He also predicts that there will be a thirty-thousand-year dark age before the next great empire rises. To prevent this, he decides to create a small haven of technology in a corner of the galaxy (on the planet Terminus) called the Foundation, whose job it will be to preserve knowledge from the collapse, thus reducing the time required for the next Empire to rebuild. If done properly, it will take only a thousand years before the next empire rises.
In 1982, following a thirty-year hiatus, Asimov gave in and wrote what was at the time a fourth volume: Foundation's Edge. This was followed shortly thereafter by Foundation and Earth. Foundation and Earth (which takes place some 500 years after Seldon) ties up all the loose ends, but opens a brand new line of thought in the last dozen pages. As a result, as a finale to the series, it failed. According to his widow Janet Asimov (in her biography of him, It's Been a Good Life), he had no idea how to continue after Foundation and Earth, so he started writing the prequels.
The series is set in the same universe as Asimov's first published novel, Pebble in the Sky, although Foundation takes place approximately ten thousand years later. Pebble in the Sky became the basis for the Empire Series. Then, at some unknown date (prior to writing Foundation's Edge) Asimov decided to merge the Foundation series with his Robot series. Thus, all three series are set in the same universe, giving them a combined length of 15 novels and a total of about 1,500,000 words. The merge also created a time span of the series of approximately 20,000 years.
Also, shortly before his death in 1992, Asimov approved an outline for three novels, known as the Caliban Trilogy by Roger MacBride Allen, set between Robots and Empire and the Empire Series, telling the story of the terraforming of the Spacer world Inferno, and about the robot revolution started by creating a No Law Robot and then New Law Robots.
The Foundation universe was once again revisited in Foundation's Friends (ISBN 0312931743 hardback, ISBN 0812509803 paperback), a collection of short stories written by many prominent science fiction authors of today. Orson Scott Card's "The Originist" clarifies the founding of the Second foundation shortly after Seldon's death; Harry Turtledove's "Trantor Falls" tells of the efforts by the Second Foundation to survive during the sacking of Trantor; and George Zebrowski's "Foundation's Conscience" is about the efforts of a historian to document Seldon's work following the rise of the second Galactic empire.
There are novels by various authors (Isaac Asimov's Robot City series, Isaac Asimov's Robots and Aliens series, and Isaac Asimov's Robots in Time series) loosely connected to the Robot Series, but they contain many inconsistencies with Asimov's books, and are not generally considered part of the Foundation Series.
In 1965, the Foundation Trilogy beat several other science fiction and fantasy series (including the Lord of the Rings by J. R. R. Tolkien)
to receive a special Hugo Award for "Best All-Time Series". It is still the
only series so honored. Asimov himself wrote that he assumed the one-time award had been created in order to honor The Lord of the Rings and he was amazed when his work won.
George Lucas used elements of the Foundation series to construct the universe in which Star Wars is set, including propulsion by hyperdrive and the Galactic Empire (although Lucas' Empire was by definition evil, while Seldon openly says that in principle the First Empire is not evil). Additionally, Coruscant, the imperial capital planet covered completely with buildings, is a direct borrowing of Asimov's Trantor (although visually they are not exactly similar; Trantor is covered in domed cities, while Coruscant's buildings are open to the air. Trantor's domed structure is a little more practically designed, in terms of exposure to inclement weather).
In 1995, Donald Kingsbury wrote "Historical Crisis", which he later expanded into a novel, Psychohistorical Crisis (ISBN 0312861028). It is not set in the same fictional universe as the Foundation series, but the universe described in it is very much similar to that of the Foundation series, being a clear and conscious borrowing. The novel explores the ideas of psychohistory into a number of new directions, inspired by more recent developments in mathematics and computer science, as well as by new ideas in science fiction itself.
It has been speculated (most prominently in the science fiction 'zines Ansible (No. 172, November 2001) and Locus) that the Foundation trilogy, which has had considerable success in the Middle East, was the source of the name of the terrorist group Al-Qaida. This speculation, however, fails to account for the fact that the term Al-Qaida, Arabic for "The Foundation", was first used by the United States to describe followers of Osama bin Laden and is not used by that group to refer to itself.
Also, the Aum Shinrikyo terrorist sect in Japan (which attacked the Tokyo subway with Sarin gas) was trying to build a community of scientists after the model of the Foundation and used this book as its inspiration.
Prelude to Foundation contains Asimov's suggested reading order/chronology for his science fiction books in the introduction. The recommended reading order of the books is below. However, it is possible that reading the books in a different order than they were written will change the understanding of the series, because it could ignore the evolution of Asimov's thinking about the Foundation or spoil plot surprises.
I, Robot (1950), the first collection of Asimov's robot stories, which were all included in The Complete Robot, though it also contains interesting binding text (Mind and Iron), no longer in The Complete Robot.
Note that this list corrects several mistakes found in the list in Asimov's Prelude to Foundation. It also adds six novels that were published after Asimov's death in 1992.
The End of Eternity is vaguely referenced in Foundation's Edge, where a character mentions the Eternals, whose "task it was to choose a reality that would be most suitable to Humanity". In Forward the Foundation Hari Seldon refers to a twenty thousand year old story of "a young woman that could communicate with an entire planet that circled a sun named Nemesis," an obvious reference to Nemesis.
On the other hand, these references might be just jokes by Asimov, and the stories mentioned could be just those really written by himself. Furthermore, Asimov himself did not mention The End of Eternity in the series listing from Prelude to Foundation. As for Nemesis, it was written after Prelude to Foundation, but in the author's note Asimov explicitly states that the book is not part of the Foundation series, but that some day he might tie it to the others.