[X] My Assistant

[ngunn]

Just posted: http://saturn.jpl.nasa.gov/files/20110329_CHARM_Kirk.pdf

[ngunn]

Emily quotes from Jeff Moore: "It's interesting to note that we never see volcanic mountains on any other icy satellite."

Well, material erupted into a vacuum behaves differently, as indeed we do see on two other outer planet satellites. Many volatiles sumlime away and projectiles move in ballistic trajectories. Anything returning to the surface is likely to be more widely spread. I think it's possible to argue that volcanic mountains are more likely to form in the presence of a significant atmosphere.

Having said that, I remain a volcanosceptic until more examples turn up.

Having said that, it's not hard to envisage ways that active endogenic processes could operate to release the methane without leaving recognisable volcanic structures.

Going further, it's not clear that endogenic processes do not operate on supposedly dead worlds such as Callisto (or Mercury).

So yes, there is still plenty of room for lively debate.

ALL of that aside, my favourite page from the presentation is page 29 - the multi-instrument montage of the Huygens landing site.