More like The Two Worlds

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Minervan Experiment / GiantsSeries
series5 books1977
completed
Science fiction and hard science fiction, mysterious in tone, about aliens and space exploration, set in far future.
“The Giants series is a quintet of science fiction novels by James P. Hogan, published between 1977 and 2005.”
from the catalogue
Start with Inherit the Stars →
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 →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Space opera, adventurous in tone.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Known SpaceUniverse
universe142 books1964
Science fiction, about aliens, set in far future and space.
“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
The AvatarNovel
Poul Andersonstandalone novel1978
Space opera, adventurous in tone, about political intrigue.
“With the aid of the political opposition, they escape and journey through the portal in search of knowledge, and perhaps even to meet those who created the portal system.”
from the catalogue
Dragon's EggSeries
series3 books1980
completed
Science fiction and hard science fiction, about aliens and space exploration, set in far future and other star systems.
Start with Dragon's Egg →