Caeruleo 7 is the seventh planet in the Caeruleo system, 2.14 light-years from Nivenia. It contains even more carbon than Caeruleo 6, making its atmosphere and mantle of great interest to the Megastructural Construction Corporation, and, by extension, the Nivenian Empire. Caeruleo 7, like Caeruleo 6, has gravity much to high for atmospheric occupation, at least by Nivenians.
The planet's interior is much hotter than it should be due to an impact by an earth-sized body approximately half a million years ago. This heat has caused large amounts of its hydrocarbon seas to boil, creating a thick, sooty layer in the middle regions of its atmosphere.