Saturn's rings make it one of the most striking planets in the solar system, but scientists believe they could disappear in less than a 100 million years -- which isn't all that long when you consider that the gas giant itself is more than 4 billion years old. New research from NASA shows that the rings, made predominantly of water ice, are being pulled apart by the planet's gravity and onto Saturn's surface as deluges of "ring rain." "We estimate that this 'ring rain' drains an amount of water products that could fill an Olympic-sized swimming pool from Saturn's rings...