Saturn

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Data
on the internal heat flux, the detailed gravity field, and the observed
upper-atmosphere hydrogen-helium ratio satisfy a model of the interior
where the ratio of hydrogen to helium decreases with depth. The gas
density gradually increases downward and the gas transforms into a liquid.
Further down the pressures increase to a critical level, and there the
hydrogen becomes metallic. A small core of silicate material probably
exists at the center.

The Saturnian atmosphere is characterized by counterflowing
easterly and westerly jet streams that, at the equator, reach a speed of
480 m/sec relative to the clouds at 40 degrees latitude. The zonal jets do
not change appreciably with time, but smaller-scale spots, waves, and
eddies were seen on voyager spacecraft images to change a time scale of
hours. Such smaller features are usually hard to observe on Saturn because
of an obscuring haze layer above the planet's cloud surface. One northern
hemisphere feature, however, known as ...

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