More like Fifth Planet

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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
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about survival, 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
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, mysterious in tone, 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
CavorSeries
series2 books1901
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 →
The Secret of the Ninth PlanetNovel
Donald A. Wollheimstandalone novel1959
Space opera, 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
Project Hail MaryNovel
Andy Weirstandalone novel2021
Hard science fiction, about amnesia, set in near future.