More like Invader

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Sector GeneralSeries
series36 books1957
Science fiction, about aliens, set in far future and space station.
“The Hospital was founded to promote peace after humanity's first interstellar war, and in the fourth book the authorities conclude that its emergency services are the most effective way to make peaceful contact with new species.”
from the catalogue
Start with Hospital Station →
The Gods ThemselvesNovel
Isaac Asimovstandalone novel1972
Hard science fiction, challenging in tone, set in parallel universe and other star systems.
The Fountains of ParadiseNovel
Arthur C. Clarkestandalone novel1979
Hard science fiction, about space exploration, set in space.
“Set in the 22nd century, it describes the construction of a space elevator.”
from the catalogue
HeecheeSeries
series19 books1972
completed
Space opera, about space exploration, set in space and other star systems.
“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 →
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, Second Formic War, Ender's Shadow, Fleet School
Space BeagleSeries
series5 books1939
completed
Adventurous and tense in tone, set in spaceship and space.
Start with Black Destroyer →