So, if you wanna make a add-on, check this list before. I'll only add Solar System ones ^^
Mercury: GalaxySpace, ExtraPlanets, MorePlanets
Venus: GalaxySpace, ExtraPlanets, MorePlanets
Earth/Moon: Vanilla
Mars: Vanilla
Moons of Mars: GalaxySpace, ExtraPlanets, MorePlanets
Ceres...