More like Cassiopeia Chronicles

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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
Alliance-UnionUniverse
universe173 books1976
Science fiction, set in far future.
“Around that spine cluster the merchanter novels of trader Families, the Faded Sun trilogy of human envoys among the martial alien Mri, and the Chanur books, narrated from the hierarchical, whiskered viewpoint of the hani.”
from the catalogue
Start with Heavy Time →
includes Chanur, Mri Wars, Company Wars, Hanan Rebellion, The Hinder Stars, Age of Exploration, Era of Rapprochement, Unionside
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
About space exploration and survival.
“One minute Kip Russell was walking about in his own backyard, testing out an old space suit and dreaming about going to the moon - and the next he was out cold and the captive of an insidious space pirate.”
from the catalogue
GaeanSeries
series3 books1979
completed
Set in outer planets & moons.
“The Gaea Trilogy consists of three science fiction novels by John Varley.”
from the catalogue
Start with Titan →
RamaUniverse
universe7 books1973
Set in spaceship.
“Something is falling through the solar system on a hyperbolic orbit, and it is not a comet.”
from the catalogue
Start with Rendezvous with Rama →
includes Rama (2)
Red PlanetNovel
Robert A. Heinleinstandalone novel1949
About coming of age.
“A boy colonist on Mars takes his bouncing ball Martian pet with him to boarding school, but the new Headmaster is a controlling tyrant.”
from the catalogue