More like Assignment Nor' Dyren

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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
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, mysterious in tone, 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
HeecheeSeries
series19 books1972
completed
Space opera, set in space.
“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 →
MesklinSeries
series6 books1954
completed
Hard science fiction.
“The idea came from an object that was at the time believed to exist in the 61 Cygni system, and which might represent an extrasolar planet.”
from the catalogue
Start with Mission of Gravity →
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
Across a Billion YearsNovel
Robert Silverbergstandalone novel1969
About expeditions, set in space.