More like Tesseracts

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A Meeting with MedusaSeries
series2 books1971
Hard science fiction, about immortality, set in far future and outer planets & moons.
“Arthur C. Clarke's A Meeting with Medusa follows an astronaut, badly injured in an earlier disaster, on a solo balloon expedition into Jupiter's atmosphere, where he encounters vast floating lifeforms unlike anything previously catalogued.”
from the catalogue
Start with A Meeting with Medusa →
Stranger in a Strange LandNovel
Robert A. Heinleinstandalone novel1961
First contact, about faith and religion and psychic powers, set in near future.
ThistledownSeries
series5 books1978
completed
Hard science fiction, set in far future.
Start with The Wind from a Burning Woman →
ManifoldSeries
series8 books1997
Hard science fiction, set in near future.
“Stephen Baxter designed the trilogy to be read in any order, since it plays out across a multiverse rather than a single continuous timeline.”
from the catalogue
Start with Time →
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
Way StationNovel
Clifford D. Simakstandalone novel1963
First contact, about loneliness, set in mid 20th century and countryside & village.
“The human operator of a transfer station for aliens traveling between planets, kept secret from the human race, deals with discovery by the US government and interplanetary political crisis, as well as his own emotional issues.”
from the catalogue