More like Colliding Worlds: Vol. 2

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Known SpaceUniverse
universe142 books1964
Set in far future and 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
CoDominiumUniverse
universe98 books1971
Military science fiction, set in other star systems and far future.
“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, Falkenberg's Legion, Laurie Jo Hansen, War World
HeecheeSeries
series19 books1972
completed
Space opera, about space exploration, set in far future and 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 →
The Goblin ReservationNovel
Clifford D. Simakstandalone novel1968
Fantasy, whimsical in tone.
TripodsSeries
series4 books1967
completed
Post-apocalyptic, about rebellion and revolution, set in near future.
“The first two books were the basis of a science fiction TV series, produced in the United Kingdom in the 1980s.”
from the catalogue
Start with When the Tripods Came →
CavorSeries
series2 books1901
About space exploration, set in the moon and early 20th century.
“H. G. Wells's 1901 novel The First Men in the Moon is narrated by the businessman Bedford, who joins the reclusive scientist Cavor after Cavor invents cavorite, a gravity-blocking substance that carries the two men to the Moon.”
from the catalogue
Start with The First Men in the Moon →