Restless Upper Atmosphere...

Caption originale:"Streamers, swirls and vortices roll across the dynamic face of Saturn.
Unlike Earth, where most of the weather is driven by the Sun, Saturn's storms and circulation are driven in part by internal heating. Amazingly, the Planet is still contracting (ever so slightly) from its formation, more than 4,5 BY (Billion Years) ago. This gravitational contraction liberates energy in the form of heat.

The image was taken in polarized infrared light with the Cassini spacecraft narrow-angle camera on March 7, 2006, at a distance of approx. 2,9 MKM (1,8 MMs) from Saturn.
The image scale is about 17 Km (roughly 10 miles) per pixel".