It is incredibly thin, however. The density of O2, for example, is probably about five trillion times less dense than the oxygen that blankets Earth.More info at BBC News.
The presence of an exosphere, as it is more properly called, was confirmed by instruments on the Cassini probe which orbits the ringed planet and its moons.
The discovery is reported in the online version of Science magazine.
Oxygen exospheres have been seen at Jupiter's moons Europa and Ganymede, but this is the first time such a detection has been made in the Saturnian system.
Saturn moon Rhea has thin atmosphere of oxygen and carbon dioxide
Posted on Saturday, November 27 2010 @ 0:45 CET by Thomas De Maesschalck