Infinite Space for Sins of a Solar Empire: Rebellion. The mod enhances the overal look and feel of the game by adding a ton of new planets and planet types, planet bonuses, rendering, tweaks and much more!
This review may contain spoilers
10/10 for now. will vote 11/10 for fixing potential bugs. like skyrim with space.
In all seriousness, this is excellent. My eyes exploded when first driving into this.