This could be an interesting hoi4 setting. Humanity colonizes the solar system and develops a load of sci-fi tech before earth gets glassed by an asteroid.
https://docs.google.com/document/d/10-NjH7ffnNJ-1Lwga_JYZc954T8Q6BeAT33G4Gq__0g/edit?tab=t.0#heading=h.x0cxuen49uym