It is clear to me that all tiny planets are not of the moon biome type, but all moon biomes appear on tiny planets. I'm looking in celestial.config, and I do not see where this is possibly specified. The best guess I have is that: moons are enabled in a given sector's unlockedBiomes list, but they are NOT enabled in "planetaryTypes" orbitParameters. They are however enabled in "satelliteTypes" orbitParameters. So this leads me to wonder: are all the planets that spawn from satelliteTypes tiny planets? (I would like to make a biome that only appears on tiny planets, much like moon biomes.)