More like The Kirilli Matter

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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, War World, Laurie Jo Hansen
Heaven Chronicles / Zones of ThoughtSeries
series8 books1976
Science fiction and space opera, set in far future and space.
Start with The Outcasts of Heaven Belt →
StarstreamSeries
series2 books1989
completed
Science fiction and space opera, tense in tone, set in far future and space.
“The two were published within a year of each other under the same author.”
from the catalogue
Start with From a Changeling Star →
QuadrailSeries
series5 books2005
Science fiction and space opera, mysterious in tone, about aliens and political intrigue, set in far future and space.
“Paired with the telepathically gifted Bayta, Compton investigates and fights the Modhri, a parasitic group-mind quietly seizing control of galactic leaders from within.”
from the catalogue
Start with Night Train to Rigel →
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 →