Vernor Vinge's 1992 space opera — set in a universe where intelligence capability varies by galactic zone (the Zones of Thought) — one of the most imaginative world-building achievements in science fiction.
Creates the Zones of Thought — Vinge's conceit that the speed of light, superintelligence, and physics itself vary by galactic location is the most imaginative solution to the Fermi paradox and faster-than-light travel problem in SF.
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