Saturn's second-largest moon Rhea has a thin atmosphere filled with oxygen and carbon dioxide, scientists said today.
The discovery by Nasa’s Cassini-Huygens mission is the first time a spacecraft has captured direct evidence of an oxygen atmosphere on a world other than Earth.
The presence of the moon’s exosphere was confirmed by instruments on the Cassini probe which orbits Saturn and its moons.
Read more: Oxygen found on Saturn's Moon Rhea, Rich in O2
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