More like The Cosmic Trilogy

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Known SpaceUniverse
universe142 books1964
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
About coming of age, set in far future and spaceship.
“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
The Secret of the Ninth PlanetNovel
Donald A. Wollheimstandalone novel1959
Set in outer planets & moons.
“Wollheim takes his heroes on a grand tour of the Solar System as that team struggles to prevent an alien force from Pluto from blowing up the Sun.”
from the catalogue
Cosmic Trilogy (C. S. Lewis)Series
series4 books1938
completed
Science fiction, about aliens and faith and religion, set in other star systems.
Start with Out of the Silent Planet →
Fifth PlanetNovel
Fred Hoyle & Geoffrey Hoylestandalone novel1963
First contact.
HeecheeSeries
series19 books1972
completed
Set in far future.
“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 →