Outermost Moon

This is the best spacecraft-acquired image of Uranus' outermost moon Oberon. Several
large impact craters, surrounded by bright rays, are visible in this view. Near the center
of Oberon's disk is a large crater with a bright central peak and a floor partially covered
with black material. This may be icy, carbon-rich material that spilled onto the crater
floor sometime after the crater formed. Another striking feature is a large mountain, about
6 km (4 mi) high, peeking out on the lower left limb.