More like Frontier Worlds

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Known SpaceUniverse
universe142 books1964
About aliens, set in far future.
“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
Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Space opera, about coming of age, set in far future.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about aliens, set in near future.
“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
Islands in the SkyNovel
Arthur C. Clarkestandalone novel1952
About space colonization, set in near future and space station.
“Clarke wrote the story as a travelogue of human settlement of cislunar space in the last half of the twenty-first century.”
from the catalogue
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, mysterious in tone, about aliens, set in far future.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Time for the StarsNovel
Robert A. Heinleinstandalone novel1956
Hard science fiction, about psychic powers and coming of age.
“Explorer spaceships need a way to communicate back to earth in a timely manner when they are light years away.”
from the catalogue