The Gaea Trilogy consists of three science fiction novels by John Varley. The stories tell of humanity's encounter with a living being in the shape of a 1,300 km diameter space habitat, inhabited by many different species, in orbit around the planet Saturn. The novels are:
- Titan (1979)
- Wizard (1980)
- Nominated for the Hugo Award for Best Novel.
- Demon (1984)
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