More like The Matthews Conundrum

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RamaUniverse
universe7 books1973
About aliens, 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)
HeecheeSeries
series19 books1972
completed
Space opera, about aliens.
“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 →
Known SpaceUniverse
universe142 books1964
About aliens.
“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
Academy / Priscilla (Hutch) HutchinsSeries
series16 books1983
About aliens.
“Beginning with The Engines of God, the series treats deep time and the near-total absence of intelligent alien life as its central mystery, favoring slow-burn discovery over action.”
from the catalogue
Start with The Engines of God →
FoundationUniverse
universe123 books1940
About robots.
“There is a science that reads the future of quadrillions the way an astronomer reads the orbits of stars.”
from the catalogue
Start with Foundation →
includes Foundation, Trantorian Empire, Second Foundation Trilogy, The Positronic Robot Stories, The Collected Fiction of Isaac Asimov, Foundation (Original Stories)
Heaven Chronicles / Zones of ThoughtSeries
series8 books1976
Space opera.
Start with The Outcasts of Heaven Belt →