[Utah-astronomy] Iapetus

Following Patrick's note in his News, I checked out the latest Cassini postings -- and I was floored by Iapetus. Take a look at this odd view: http://saturn.jpl.nasa.gov/multimedia/images/raw/raw-images-details.cfm?feiI... That URL has the caption. Click on the picture to get a larger picture. Anyway, I'm wondering if Iapetus got smacked by a big, dirty asteroid, which left a huge dark patch on it. Best wishes, Joe