If you were in orbit near Saturn, you'd see a subtle amber-orange world with faint whorls of cloud moving majestically in bands across its delicate face. But if you were actually down among the clouds: Wow! Different story! It's a maelstrom. Saturn is home to the fastest winds in the solar system.

Yet Saturn—remember, it's a gas giant—has the lowest density of any object in the solar system. It's much less dense than water. That gassy atmosphere is 90% hydrogen and 10% helium. The clouds are mostly ammonia, ammonium hydrosulfide, and water ice crystals.

Beneath Saturn's atmosphere lies a molecular hydrogen shell, a liquid hydrogen mantle, and possibly a rocky core. Saturn is also the most "squashed" of all the planets. It's fully 10% wider at its equator than it is at the poles, which enhances the visual effect of the rings.