More like The Time Fighters

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CoDominiumUniverse
universe98 books1971
Military science fiction, set in other star systems.
“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, Laurie Jo Hansen, Falkenberg's Legion, War World
ThistledownSeries
series5 books1978
completed
Hard science fiction, about space exploration.
Start with The Wind from a Burning Woman →
Known SpaceUniverse
universe142 books1964
About aliens, 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, Man-Kzin Wars, Fleet of Worlds
FoundationUniverse
universe123 books1940
About robots.
“There is a science that reads the future of quadrillions the way an astronomer reads the orbits of stars.”
from the catalogue
Start with Foundation →
includes Trantorian Empire, Foundation, The Positronic Robot Stories, The Collected Fiction of Isaac Asimov, Second Foundation Trilogy, Foundation (Original Stories)
Forever WarSeries
series10 books1972
Military science fiction.
Start with Hero →
HeecheeSeries
series19 books1972
completed
About aliens and space exploration, 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 →