Callisto is heavily cratered and has a water ice surface
ice water
heavily cratered, water ice surface
There is no liquid water on Calisto. It does have a lot of ice on its surface, so it has frozen water.
A thick water ice surface with a layer of subsurface salt water underneath.
Callisto's surface age is 4 billion years old.
Yes
The surface of Callisto is heavily cratered and extremely old. It does not show any sign of volcanic activity.
yes
water
Surface of MercurySurface of GanymedeSurface of Callisto
Older than 4 billion years