Encyclopedia Galactica

A compendium of all knowledge intended for preservation, serving as both a scholarly refuge and a strategic misdirection.

The Encyclopedia Galactica is the name of a number of fictional or hypothetical encyclopedias containing all the knowledge accumulated by a galaxy-spanning civilization, most notably in Isaac Asimov's Foundation series. First appearing in the short story "Foundation" published in Astounding Science Fiction in May 1942, it was originally referred to simply as the Encyclopedia before the term Galactica was adopted for the later fix-up novel released in 1951. However, this public mission served as an act of misdirection; its true purpose was to concentrate knowledgeable scientists on a resource-poor world with the long-term aim of revitalizing the technologically stagnant and scientifically dormant empire. Originally published physically, it later became computerized and subject to continual change.

Quick Facts

First appearance: "Foundation" (Astounding Science Fiction, May 1942)
Original name: The Encyclopedia
Fix-up publication year: 1951
Location: Terminus
Original medium: Physical
Later medium: Computerized

Lore & Background

In Isaac Asimov's Foundation series, the Encyclopedia Galactica functions as a critical literary device. The author frequently begins book sections or chapters with short extracts from the text acting as epigraphs, which discuss key characters or events to provide the reader with a hazy idea of what is to come. The concept may have been inspired by H.G. Wells's 1933 work The Shape of Things to Come, which features an "Encyclopaedic organization" centered in Barcelona with seventeen million active workers tasked with creating a "Fundamental Knowledge System." Patricio Manns analyzed the text as a paratextual element intended to contextualize the action and bring the trilogy closer to the historical novel. Over time, the physical medium evolved into a computerized database that remained subject to continuous updates as the Foundation grew.

Reader's Guide

For readers exploring the Foundation universe, the Encyclopedia Galactica is essential for understanding the series' structure and themes. It operates as a repository of all knowledge from the Galactic Empire, intended to survive a predicted catastrophe. To engage with it effectively, note its evolution: starting as physical books in 1942 fiction and transitioning to computerized formats later in the timeline. When reading the novels, pay close attention to the epigraphs at the start of chapters; these are direct extracts from the Encyclopedia designed to offer context or foreshadowing.

The text serves a dual purpose: it preserves history while simultaneously hiding Seldon's psychohistorical plan to rebuild civilization. Scholars in-universe view it as an objective record, but the reader knows it is a tool for misdirection. Its relevance extends beyond Asimov, appearing in works by Orson Scott Card, Robert A. Heinlein, and Arthur C. Clarke.

Did You Know?

Frank Holby used the specific term 'Encyclopedia Galactica' before Asimov did, in his July 1942 story 'The Strange Case of the Missing Hero'.
In Douglas Adams' comic science fiction series, the Encyclopedia Galactica is frequently contrasted with the apparently more popular Hitchhiker's Guide to the Galaxy.
Orson Scott Card set his 1989 story 'The Originist' within Asimov's Foundation universe, mentioning the collection as containing all knowledge of a galactic Empire.