Space Ambience sound effects, royalty-free and cleared for commercial work. 3 libraries carry this tag, most of them filed under Sci-fi and Game Audio Bundles.
Recordists here also tag Machine, Spaceship and nitro, which is worth a look if nothing below fits.
Spaceship sound effects including engine starts, thrusters, hyper jumps, gun turrets, space guns, alarms, hangar doors, landing gear, and nitro boosts for game audio and sci-fi projects.
A library of 313 sci-fi sound effects and loops, including spaceship and weapon audio, alien and monster vocals, atmospheric tones, ambient loops, character movement, and inventory sounds.
Dark sci-fi ambiences blend with futuristic synth textures, while cinematic sound effects include deep drones, metal impacts, and atmospheric transitions - ideal for films and games.