More like Diving Into the Wreck

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HeecheeSeries
series19 books1972
completed
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
Heaven Chronicles / Zones of ThoughtSeries
series8 books1976
Science fiction and space opera, set in far future and space.
Start with The Outcasts of Heaven Belt →
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 →
Solar QueenSeries
series7 books1955
Set in spaceship.
“Andre Norton's Solar Queen novels follow the crew of a free-trader starship under Captain Jellico as they scrape by hauling cargo and making first contact on the fringes of settled space.”
from the catalogue
Start with Sargasso of Space →
UpliftUniverse
universe13 books1980
About uplift and aliens.
“No species, the Galactics insist, ever climbs to sapience alone.”
from the catalogue
Start with Sundiver →
includes Uplift, Uplift Storm