EntityQ468· pop 21· linked from 86 articlesEncyclopedia GalacticaSign in to savefictional encyclopædia in several science-fiction universesConnectionsFoundation seriesEntityAnalog Science Fiction and FactEntityencyclopediaEntitygalaxyEntitycivilizationEntityknowledgeEntityH. G. WellsEntityInternational Standard Book NumberEntityIsaac AsimovEntityCarl SaganEntityDouglas AdamsEntityArthur C. ClarkeEntityWayback MachineEntitySupermanEntitydigital object identifierEntityRobert A. HeinleinEntitychildren's literatureEntityOCLC, Inc.EntityDiscovery ChannelEntitystylistic deviceEntityCategoriesFictional encyclopediasFictional story elements introduced in 1942Foundation universeInterstellar communicationScience fiction themesThe Hitchhiker's Guide to the Galaxy