The game occasionally spawns systems with lone planets that start out destroyed and have a tooltip stating that they can be restored by a Behemoth with an Advanced Climate Engineering Module, but when I go to the planet to try to restore it, I do not get the option to do so.  The system is within my sphere of influence, but I cannot claim it because there are no colonizable planets.  I was hoping it was a cool "questy" planet that you could restore, but my guess is that it's just another disappointing bug or unfinished feature.