Saturn's rings are its calling card — made mostly of countless chunks of water ice ranging from tiny dust grains to mountain-sized boulders, all held in place by the planet's gravity. It takes Saturn roughly 29.4 Earth years to complete one full orbit of the Sun.
Of its 146 known moons, two are true stand-outs: Titan, the only moon in the solar system with a thick atmosphere, clouds, and even lakes and rivers of liquid methane; and Enceladus, an icy world that shoots geysers of salty water into space — geysers that actually help form one of Saturn's rings.