More like The Silent Invaders

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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, Man-Kzin Wars, Fleet of Worlds
Catteni SequenceSeries
series5 books1970
completed
Space opera, about slavery.
“The Catteni series is a tetralogy of science fiction novels by American writer Anne McCaffrey.”
from the catalogue
Start with Freedom's Landing →
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
MindswapNovel
Robert Sheckleystandalone novel1966
Funny in tone, about body swap, set in space.
MesklinSeries
series6 books1954
completed
Hard science fiction, about space exploration.
“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 →
Of Man and MantaSeries
series3 books1968
Science fiction, adventurous in tone, about aliens, set in other star systems and far future.
“Three scientists survive on the mysterious planet of Nacre.”
from the catalogue
Start with Omnivore →