Atmosphere - Atmosphere The outer atmosphere of Saturn...

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Atmosphere The outer atmosphere of Saturn consists of 96.3% molecular hydrogen and 3.25% helium. [35] This proportion of helium is significantly deficient relative to the abundance of the elements in the Sun. [26] The quantity of elements heavier than helium are not known precisely, but the proportions are assumed to match the primordial abundances from the formation of the Solar System. The total mass of these elements is estimated to be 19–31 times the mass of the Earth, with a significant fraction located in Saturn's core region. [36] Trace amounts of ammonia , acetylene , ethane , propane , phosphine and methane have been detected in the planet's atmosphere. [37] [38] [39] The upper clouds on Saturn are composed of ammonia crystals, while the lower level clouds appear to be composed of either ammonium hydrosulfide (NH 4 SH) or water. [40] Ultraviolet radiation from the Sun causes methane photolysis in the upper atmosphere, resulting in a series of hydrocarbon chemical reactions with the
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Atmosphere - Atmosphere The outer atmosphere of Saturn...

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