Yeah! I figured out that it will be on each planet, including Stars (Suns) and just because you made me wonder all day long, I decided to make a mod about it. A mod which changes the sphere.x file and you should wait patiently until it is approved.

Space Empires doesn't have model for each planet, it's only for each planet type, that is Habitable, Not Habitable, Gas Giant, Moon, Gas Giant with Rings, Habitable with Rings, Not Habitable with Rings and I think that is it.
And I never encountered such "out of memory" error in the past, so I didn't understand. Yes, I do use Dread Lords, but this is about to change soon anyway.
EDIT: Ok, but there must be some connection to it, it happens each and every game, I also thought this is because Mars is level 4 while Earth is 11, but all those pure chances are not so rare, in fact, when I took the screenshot for the new mod, it was as I told you, and I will screenshot that for you if you wish.