Cassini finds oxygen-carbon dioxide atmosphere on Saturn's moon Rhea
Friday, November 26, 2010 - 07:00
in Astronomy & Space
(PhysOrg.com) -- In a flyby past Rhea, Saturn's second-largest moon, NASA's spacecraft Cassini has revealed the presence of a thin atmosphere of 70 percent oxygen and 30 percent carbon dioxide, which is apparently sustained by chemical decomposition of the moons ice-covered surface.