THE SECOND LARGEST MOON IN THE
SATURN SYSTEM, Rhea has a composition, appearance and brightness similar to Dione.
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| Rhea |
Around 25% rocky material and 75% water ice,
despite its mass giving it the status of the ninth largest moon in the Solar System, it is believed that Rheas's interior is not differentiated. Its structure is a mixture of rock and ice with no defined core.
Like Titan, Rhea has an atmosphere composed of oxygen and carbon dioxide, though it is so thin as to be barely visible. Oxygen in the atmosphere is the result of water ice on Rhea's surface breaking down, but it is not clear where the carbon dioxide originates.
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| A false colour image of Rhea |
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