More like The Cluster Series

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Known SpaceUniverse
universe142 books1964
Science fiction, about aliens, set in far future and 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
Citizen of the GalaxyNovel
Robert A. Heinleinstandalone novel1957
About coming of age and slavery.
“On a planet far distant from Earth, a lame beggar buys a young boy slave who has forgotten his origins.”
from the catalogue
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Mysterious in tone, about space exploration.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
The Stars My DestinationNovel
Alfred Besterstandalone novel1956
Dark in tone, about revenge and survival.
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 Mri Wars, Chanur, Hanan Rebellion, Era of Rapprochement, Age of Exploration, The Hinder Stars, Company Wars, Unionside
HeecheeSeries
series19 books1972
completed
About space exploration.
“The Heechee are an advanced alien race that visited the Solar System hundreds of millennia ago and then mysteriously disappeared.”
from the catalogue
Start with Gateway →