QUOTE (David @ Oct 31 2006, 05:16 PM)
Are my eyes playing tricks on me, or do some of those clouds have discernible shadows, suggesting that they're projecting a considerable height above a lower cloud layer?
Saturn has a very "deep" atmosphere. The cloud-level gravity is actually only slightly greater than Earth's, and at cloud depths, the temperature is comparable to that of Earth's cloud levels. But Saturn has the lowest molecular weight atmosphere of any in the solar system -- almost pure H2. Simply put, that gives Saturn about 7 times the scale height of Earth, so cloud phenomena get some tremendous vertical stretching.