Starship Asterisk*

Wow! It's really dark!

http://antwrp.gsfc.nasa.gov/apod/ap060103.html

Almost looks like it was painted. Do you suppose volcanic activity may have caused this; or could the moon be made of dark material?

Orin

it resembles polar frosting

Most hydrocarbon ice darken do to radiation exposure, but new cratering exposes the lighter colored ice below. So it is either a geologically inactive moon or its not hydrocarbon ice.