Nature.com - July 18, 2007
Pluto's neighbouring object, Charon, could be spewing out liquid water from ultra-cold volcanoes, covering Charon's chilly surface with freshly-formed ice crystals.
This dramatic conclusion was made by Jason Cook at Arizona State University, Tempe, who looked at Charon's near-infrared spectrum using telescopes at the Gemini Observatory at Mauna Kea, Hawaii. ...