More like Gaean

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Known SpaceUniverse
universe142 books1964
Set in other star systems.
“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
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Set in other star systems.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
HeecheeSeries
series19 books1972
completed
Set in other star systems.
“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 →
Humanx CommonwealthUniverse
universe39 books1972
Set in other star systems.
“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, The Founding of the Commonwealth, Icerigger Trilogy
Space BeagleSeries
series5 books1939
completed
Tense in tone, set in spaceship.
Start with Black Destroyer →
The AvatarNovel
Poul Andersonstandalone novel1978
About political intrigue, set in other star systems.
“With the aid of the political opposition, they escape and journey through the portal in search of knowledge, and perhaps even to meet those who created the portal system.”
from the catalogue