More like Worlds Long Lost

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HeecheeSeries
series19 books1972
completed
Science fiction and space opera, about aliens and space exploration, set in far future and space.
“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
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 Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
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
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
The AvatarNovel
Poul Andersonstandalone novel1978
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
Starman JonesNovel
Robert A. Heinleinstandalone novel1953
Adventurous in tone, about coming of age, set in spaceship.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue