I have a new story up on the main Nature News site that tries to piece together the growing evidence for an ice volcano at Hotei Arcus, a region of Titan pictured here in an artist’s illustration. Bob Nelson and Randy Kirk were already onto Hotei at AGU in December, but they hadn’t yet processed everything from two close Cassini flybys on November 19 and December 5. The new data have allowed them a better grasp of the shape of the landscape, which looks volcanic, and Nelson is making the bold claim that, as the region gets brighter, a spectral signature for ammonia (a likely “lava” ingredient) also grows.

Image: JPL/NASA