Nothing else in the Solar System is quite like Saturn. At its poles, a terrible storm rages, a perfect hexagon twenty thousand miles wide with raindrops of molten diamond, flung by 300-mph winds.

Saturn and Venus are in the western sky ... Jupiter and Mars have joined a famous asterism called the Winter Hexagon. It’s made of six bright stars that surround Orion the Hunter.

Twenty years ago, a rocket launched from Cape Canaveral in Florida on a billion mile trek to Saturn. The photos the probe took revealed some astonishing things about Saturn, its rings and moons.