More like First Contact

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Fifth PlanetNovel
Fred Hoyle & Geoffrey Hoylestandalone novel1963
Science fiction and first contact, adventurous in tone, about aliens and space exploration, set in mid 20th century and space.
Known SpaceUniverse
universe142 books1964
Set in far future.
“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
HeecheeSeries
series19 books1972
completed
Space opera, set in far future.
“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, set in far future.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
The AvatarNovel
Poul Andersonstandalone novel1978
Space opera, about political intrigue, set in far future.
“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
The Secret of the Ninth PlanetNovel
Donald A. Wollheimstandalone novel1959
Space opera, set in outer planets & moons.
“Wollheim takes his heroes on a grand tour of the Solar System as that team struggles to prevent an alien force from Pluto from blowing up the Sun.”
from the catalogue