Moonday: Helene (Again)

I won't make a habit of using the same moon twice in a row, but this is too cool to pass up. NASA's image of the day is a high-resolution shot of Helene, captured by Cassini just two days ago. I'm struck by the evident streamers on the surface... I have some ideas what they might be, but I'll keep them to myself. Poorly informed guesses can cause more problems than they're worth. (Full size image here; definitely worthwhile)