More like Spin / Hypotheticals

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RamaUniverse
universe7 books1973
Set in spaceship.
“Something is falling through the solar system on a hyperbolic orbit, and it is not a comet.”
from the catalogue
Start with Rendezvous with Rama →
includes Rama (2)
Ender's GameUniverse
universe39 books1977
Science fiction, set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender Wiggin, First Formic War, Ender's Shadow, Second Formic War, Fleet School
HeecheeSeries
series19 books1972
completed
Space opera.
“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 →
Project Hail MaryNovel
Andy Weirstandalone novel2021
First contact, about amnesia and friendship, set in spaceship.
Stranger in a Strange LandNovel
Robert A. Heinleinstandalone novel1961
First contact, about faith and religion and psychic powers, set in north america.
Forge of GodSeries
series2 books1987
completed
Dark and tense in tone.
“Earth faces destruction when an inscrutable and overwhelming alien form of life attacks.”
from the catalogue
Start with The Forge of God →