
, Home About Centauri Dreams Errata Contact Tau Zero Foundation Subscribe Centauri Dreams The News Forum of the Tau Zero Foundation Oxygen , Carbon Dioxide on Rhea by Paul Gilster on November 30, 2010 Interesting chemistry on the surface of Saturn’s moon Rhea seems a natural conclusion following the announcement of the discovery of oxygen in its evanescent atmosphere . And what a difference from Saturn’s largest moon , Titan , whose atmosphere is not only thick , but packed with nitrogen and methane , with little trace of carbon dioxide or oxygen . Rhea’s tenuous exosphere , which includes carbon dioxide , is so thin that its density of oxygen is about five trillion times lower than that of Earth’s atmosphere . Even so , interesting things may happen on an icy surface in this . scenario