Although the majority of it is covered by nitrogen and methane ices, where the albedo ranges from 78 to 90%, there are small patches of dark terrain whose albedo is only 2 to 12%, and that make up 3 to 7% of the surface.
Dok je većina površine pokrivena dušičnim i metanskim ledom s albedom od 78% do 90%, postoje još i crne pjege koje pokrivaju 3 do 7 % površine i imaju albedo od 2 do 12%.