singedsun

Probably not "chill" as in happy relaxation, but probably good for writing?

I loved Suspended Annihilation by HALOED, it gave me incredibly strong Ghost In The Shell vibes (as in this scene - skip to 2:20, Youtube doesn't let me copy the timestamp). Very similar atmosphere and synths.

Sector Hydra by Dronny Darko & RNGMNN is an SF/horror hybrid concept album that's soothing and sinister at the same time. Not the horror of action-packed fights with aliens, but of being stranded on an alien planet with abandoned structures, where an encounter could nevertheless be around the corner. My favourite is "Departure Probe".

Ionosphere's "Angular Momentum" is another concept album about space exploration, quite dark and at times veering towards oppressive noise/industrial. More technical than organic, with a lot of radio chatter, very evocative. Someone was kind enough to curate a playlist of its tracks on Youtube. Hard for me to pick favourites, but I'd recommend "Gravitational Repulsion" and the titular "Angular Momentum".

I've already recommended SleepResearch_Facility's NOSTROMO in my review of Ridley Scott's ALIEN, but it's just so good that I need to bring it up again. The soundscapes are soft and droning enough that you could be lulled to sleep by them, but they're having a threatening undertone regardless, as is fitting for ALIEN.

Regarding weird space: Lost Sanctum, by Lull. Despite the name, the drones with some high-pitched synths on top always make me envision the cold glare of the stars and an alien spaceship's empty rooms large as cathedrals. Also works well for interstellar gate travel.

Speaking of gate travel: Timothy Fife's "Transcommunication" is about occult rites to contact parallel dimensions, but I always found the track Cardinal Point to have a science-fiction feel to it, especially the later half which evokes the works of Jean-Michel Jarre.