It seems oxygen is far more abundant than we ever suspected, particularly on moons that seem to be completely frozen solid. We recently found evidence of oxygen on Jupiter’s moons Europa and Ganymede, and now this finding on Rhea. In fact, because the region of space surrounding Saturn’s rings has an oxygen atmosphere, it’s thought even more of the icy moons within the gas giant’s magnetosphere likely have little atmospheres of their own.” (io9)
“Saturn’s icy moon Rhea has an oxygen and carbon dioxide atmosphere that is very similar to Earth’s. Even better, the carbon dioxide suggests there’s life – and that possibly humans could breathe the air.