More like Declassified

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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
CoDominiumUniverse
universe98 books1971
Military science fiction.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, Falkenberg's Legion, Laurie Jo Hansen, War World
The Final ArchitectureSeries
series6 books2021
About war.
“Eighty years ago, Earth was destroyed by an alien 'Architect'.”
from the catalogue
Start with Shards of Earth →
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, Company Wars, The Hinder Stars, Hanan Rebellion, Era of Rapprochement, Age of Exploration, Unionside
Shoal SequenceSeries
series4 books2007
Science fiction and space opera, tense in tone, about aliens, set in far future and space.
“Gary Gibson's Shoal Sequence opens with Stealing Light, set two centuries into humanity's uneasy dependence on the Shoal, an alien race that alone holds the secret of faster-than-light travel.”
from the catalogue
Start with Stealing Light →
Mission to UniverseNovel
Gordon R. Dicksonstandalone novel1965
Adventure.
“Forever and a day - Brigadier General Benjamin Shore ignores a Presidential command and launches a revolutionary phase ship and its crew on an incredible journey deep into uncharted regions toward Galactic Centerpoint...”
from the catalogue