More like En Route to Pluto

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CavorSeries
series2 books1901
About aliens, set in the moon and underground & caves.
“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 →
A Columbus of SpaceNovel
Garrett P. Servissstandalone novel1911
Adventure, about aliens, set in venus & inner planets and space.
“The year was 1909 and Garrett Putnam Serviss was already a respected science writer for the Hearst newspaper group.”
from the catalogue
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, Fleet of Worlds, Man-Kzin Wars
Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Space opera, set in space and 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
GaeanSeries
series3 books1979
completed
Space opera, about aliens, set in space and far future.
“The Gaea Trilogy consists of three science fiction novels by John Varley.”
from the catalogue
Start with Titan →
Islands in the SkyNovel
Arthur C. Clarkestandalone novel1952
About space colonization, set in near future and space.
“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