More like Fuzzy Ergo Sum

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Known SpaceUniverse
universe142 books1964
Set in space.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Ringworld, Fleet of Worlds, Man-Kzin Wars
Alliance-UnionUniverse
universe173 books1976
Science fiction, set in far future.
“Around that spine cluster the merchanter novels of trader Families, the Faded Sun trilogy of human envoys among the martial alien Mri, and the Chanur books, narrated from the hierarchical, whiskered viewpoint of the hani.”
from the catalogue
Start with Heavy Time →
includes Chanur, Mri Wars, Hanan Rebellion, The Hinder Stars, Unionside, Era of Rapprochement, Company Wars, Age of Exploration
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, mysterious in tone, about space exploration, set in space.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Humanx CommonwealthUniverse
universe39 books1972
Set in space.
“Two species that ought, by every buried instinct, to recoil from one another instead clasp hand to truhand and build a galaxy together.”
from the catalogue
Start with For Love of Mother-Not →
includes Pip & Flinx, Icerigger Trilogy, The Founding of the Commonwealth
WolflingNovel
Gordon R. Dicksonstandalone novel1969
Space opera, tense in tone, about class conflict, set in space.
“Jim was just another wolfling to Afuan - a lesser being from a backward colony world.”
from the catalogue
The AlgebraistNovel
Iain M. Banksstandalone novel2004
Space opera, set in space.