More like The Space Guardians

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Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Tense in tone, about survival.
“One minute Kip Russell was walking about in his own backyard, testing out an old space suit and dreaming about going to the moon - and the next he was out cold and the captive of an insidious space pirate.”
from the catalogue
Ender's GameUniverse
universe39 books1977
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 First Formic War, Second Formic War, Ender's Shadow, Ender Wiggin, Fleet School
RamaUniverse
universe7 books1973
Set in spaceship.
“Something is falling through the solar system on a hyperbolic orbit, and it is not a comet.”
from the catalogue
Start with Rendezvous with Rama →
includes Rama (2)
GaeanSeries
series3 books1979
completed
Set in outer planets & moons and far future.
“The Gaea Trilogy consists of three science fiction novels by John Varley.”
from the catalogue
Start with Titan →
H. G. Wells' War of the WorldsUniverse
universe65 books1898
Alien invasion.
“No one would have believed, in the closing years of the nineteenth century, that human affairs were being watched keenly and closely from the timeless worlds of space.”
from the catalogue
Start with The War of the Worlds →
includes The War of the Worlds
ThistledownSeries
series5 books1978
completed
Hard science fiction, set in far future.
Start with The Wind from a Burning Woman →