Thin air - Cassini finds ethereal atmosphere at Rhea
Tuesday, November 30, 2010 - 17:03
in Astronomy & Space
NASA's Cassini spacecraft has detected a very tenuous atmosphere known as an exosphere, infused with oxygen and carbon dioxide around Saturn's icy moon Rhea. This is the first time a spacecraft has directly captured molecules of an oxygen atmosphere - albeit a very thin one - at a world other than Earth...