Look at Saturn through a telescope and it is easy to understand why humans have been fascinated by it for centuries. There is the enormous golden planet. There are the rings — impossibly thin from certain angles, yet stretching across hundreds of thousands of kilometres. And then there are the moons, scattered around the planet like a miniature planetary system. But Saturn becomes much more interesting when you look closer. Underneath those beautiful rings is a giant world made mostly of hydrogen and helium. Around it is an enormous family of moons, each with its own personality. Some are frozen and scarred. Some appear to have oceans hidden beneath their surfaces. One has rivers, lakes and seas — except they aren't made of water. And one of them may be one of the most intriguing places to look when scientists ask a very big question: Could life exist somewhere beyond Earth? NASA currently lists 293 confirmed moons around Saturn, more than any other planet in the Solar System. That number alone tells us something important. Saturn isn't simply a planet with a few satellites. Saturn is a planetary system. A Giant Floating in the Outer Solar System Saturn is the sixth planet from the Sun and the second-largest planet in our Solar System, after Jupiter. It is enormous — roughly 120,500 kilometres across at its equator, about nine times wider than Earth. Yet Saturn has one of the strangest characteristics among the planets. It is extremely light for its size. Saturn is made primarily of hydrogen and helium, and its average density is actually lower than water. If there were a bathtub large enough to hold Saturn, the planet would theoretically float. Of course, building that bathtub would be a slightly unreasonable engineering project. Saturn also spins remarkably quickly. A Saturnian day lasts only about 10.7 hours, while one trip around the Sun takes approximately 29.4 Earth years. So if you lived on Saturn — assuming there were somewhere to stand — your birthday would come only once every three decades. The Rings Are More Complicated Than They Look Saturn's rings are probably the first thing anyone notices. From a distance, they look like solid discs. They aren't. The rings are made primarily of countless pieces of water ice mixed with rock and dust. Their particles range from microscopic grains to objects tens of metres across. And here is the strange part: The rings are enormous in width but incredibly thin vertically. The main ring system extends hundreds of thousands of kilometres from Saturn, while the main rings are typically only around 10 metres high vertically. Imagine taking something hundreds of thousands of kilometres wide and flattening it to roughly the height of a building. That is Saturn's ring system. There isn't just one ring, either. Saturn has several major ring structures, including the D, C, B, A, F, G and E rings. Between the A and B rings lies the famous Cassini Division, a large gap created by gravitational interactions within the ring system. And the rings aren't simply beautiful decorations. They are a record of Saturn's history. Their particles interact with Saturn's moons, gravity, magnetic environment and each other. Studying them helps scientists understand how planetary systems evolve. Then Come the Moons This is where Saturn stops being merely beautiful and becomes genuinely strange. Its moons come in an extraordinary variety of shapes and sizes. Some are tiny. Some are irregular chunks of rock and ice. Some look like potatoes. One looks surprisingly like a ravioli. And then there is Titan. And Enceladus. These two worlds have become major targets of planetary science for very different reasons. Titan: A Moon With Weather, Rivers and Seas Titan is Saturn's largest moon and the second-largest moon in the Solar System. It is also the only moon known to have a substantial atmosphere. But Titan's atmosphere isn't like Earth's. Its skies are thick and hazy, rich in nitrogen and complex organic chemistry. And on Titan, something familiar happens in a completely unfamiliar way. It rains. There are rivers. There are lakes. There are seas. But the liquid isn't water. Titan's surface contains lakes and seas of liquid methane and ethane. Think about that for a moment. Somewhere roughly 1.4 billion kilometres from the Sun, there is a moon where clouds form, rain falls and rivers flow across the surface — but the entire weather cycle runs on hydrocarbons rather than water. It is almost like Earth was rewritten using a completely different chemical language.