More like Three from the Tomb

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RiverworldSeries
series37 books1965
About faith and religion, set in far future and other star systems.
“The Riverworld is an artificial, or heavily terraformed, planet where all humans who ever lived throughout history have been resurrected.”
from the catalogue
Start with River of Eternity →
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 →
Known SpaceUniverse
universe142 books1964
About aliens, set in far future and space.
“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
Time for the StarsNovel
Robert A. Heinleinstandalone novel1956
Hard science fiction, about psychic powers, set in space.
“Explorer spaceships need a way to communicate back to earth in a timely manner when they are light years away.”
from the catalogue
The Sands of MarsNovel
Arthur C. Clarkestandalone novel1951
Hard science fiction, about space exploration and terraforming, set in mars.
TimelineNovel
Michael Crichtonstandalone novel1999
Time travel, about survival, set in europe and medieval.