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Thin air - Cassini finds ethereal atmosphere at Rhea

Science Centric (30 Nov 2010 21:38 GMT) - 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…

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