While listening to the latest masterpiece by Blood Incantation, I reminded myself how much I like space or sci-fi themed albums.
While I do find a lot of modern technical death metal adopt the theme, I'm usually not a fan of the music itself, as I am very picky with modern, over-produced death metal.

I do however love when the coldness of black metal is melded with a sci-fii/spacial atmosphere.

Searching for stuff like Darkspace, Thorns, Progenie Terrestre Pura, Khonsu, etc.

Limbonic Art - In Abhorrence Dementia
Mare Cognitum - Luminiferous Aether
Oranssi Pazuzu - Muukalainen puhuu
Rhinocervs - RH-07

Any of these within the ballpark?

A personal favourite of mine, Khonsu.

https://khonsu.bandcamp.com/album/the-xun-protectorate

https://www.metal-archives.com/bands/Hoth/3540357307 started out as proud star wars fanboys, then did a total U-turn, so their sci-finess depends entirely on whether you take their opinion into account...

If we only knew the lyrics. Only the cover gives a hint there.

Hoth is still basically Star Wars without directly saying it.

try telling that to them, they'll chop your head off with a lightsabre...

then they'll claim that it's not actually a lightsabre, but a crystal-powered blade weapon inspired by Norse mythology, and it just so happens that it sorta (but not really) looks like a lightsabre, but isn't. honest, it's not.

Oops, I didn't realize this was just for black metal. Almyrkvi have this weird psychodelic/space vibe going on, maybe they fit what you're looking for.

Spheres of Aldebaran, cold and distant black metal that features sci-fi/space/alien themes. https://spheres.bandcamp.com/

Fuck YES.

Moondweller - The Search

Cold and dark space black metal, should fit your needs.