More like The Impossible Moon

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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, Fleet of Worlds, Man-Kzin Wars
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, Second Foundation Trilogy, The Positronic Robot Stories, The Collected Fiction of Isaac Asimov, Foundation (Original Stories)
HeecheeSeries
series19 books1972
completed
About aliens, 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 →
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 →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
About aliens, 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
CommonwealthUniverse
universe12 books2002
Science fiction and space opera, set in far future.
“Step aboard the train at the Second Chance terminal and ride the wormhole to another star.”
from the catalogue
Start with The Dreaming Void →
includes Void Trilogy, Commonwealth Saga, Chronicle of the Fallers