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Forum:	Satellites - Robotic Probes
Topic:	Cassini-Huygens at Saturn: Questions, comments

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Your Reply: HTML is ON UBB Code is ON Smilies Legend	[QUOTE]Originally posted by DChudwin: [B]National Geographic: [URL=http://news.nationalgeographic.com/news/2010/11/101125-saturn-moon-oxygen-atmosphere-discovered-science-space]Saturn Moon Has Oxygen Atmosphere [/URL] <BLOCKQUOTE>[i]NASA's Cassini spacecraft, which has been orbiting the Saturnian system since 2004, detected the oxygen atmosphere around Rhea during a close flyby of the icy moon in March. Cassini's data show that molecular oxygen (O2) forms inside the moon's surface ice when water molecules (H2O) are split by energetic ions, a process known as radiolysis. The oxygen then gets ejected from the surface ice and captured by Rhea's gravity to form the atmosphere. "A loose analogy might be carbon dioxide dissolved, or trapped, in a carbonated beverage, except here we are not talking about liquid water but rather frozen ice at extremely low temperatures," Teolis said.[/i]</BLOCKQUOTE>[/B][/QUOTE]
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