Class 55 planet

  This is a class 55 planet I culturally conquered from the Terrans in a DA metaverse game.  It was almost full with invention matrices when it rebelled (I demolished them all because I had already reached the end of many tech trees with my neutrality learning centers):

  There was at least one earlier megaevent which increased the base quality of planets,  but I forget the details because the planet(s) were not mine at that tiime.