In many cases, surface features are caused by unknown processes and can only be described.
Many of the craters have bright walls but dark floors, indicating that fresher ice is brighter.
Nearly parallel grooves run from the upper right to the lower left.
Fractures sometimes across the bottom of craters, indicating a relatively recent formation.
The lip of a 60-kilometer wide crater runs from the middle left to the upper center of the image, while the crater's center is visible on the lower right.
