More like The Alien Factor

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Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about survival, set in the moon.
“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
Mission to UniverseNovel
Gordon R. Dicksonstandalone novel1965
Space opera, set in far future and other star systems.
“Forever and a day - Brigadier General Benjamin Shore ignores a Presidential command and launches a revolutionary phase ship and its crew on an incredible journey deep into uncharted regions toward Galactic Centerpoint...”
from the catalogue
A Columbus of SpaceNovel
Garrett P. Servissstandalone novel1911
Set in venus & inner planets and early 20th century.
“The year was 1909 and Garrett Putnam Serviss was already a respected science writer for the Hearst newspaper group.”
from the catalogue
The Crimson DeathbringerSeries
series1 book2019
Space opera and military science fiction, about war, set in other star systems.
“Soon after, their lives are set on a crash course with a galactic war that threatens the very existence of the human race.”
from the catalogue
Start with The Crimson Deathbringer →
Space BeagleSeries
series5 books1939
completed
Space opera, set in far future and spaceship.
Start with Black Destroyer →
All Judgment FledNovel
James Whitestandalone novel1968
First contact, mysterious in tone.
“From the front flap of the Rapp first edition: It is the spring of 1978 and a gigantic alien spaceship has entered the solar system and taken up an orbit some sixty million miles from the Sun.”
from the catalogue