Planetary scientist Sheila Kanani takes us on a visual tour of Saturn and its many moons. When Galileo first looked at Saturn he thought it was a very strange object, but wasn't entirely sure what to make of it. About 400 years later, in 1997, Nasa sent a spacecraft, called Cassini, to Saturn, allowing us to see the planet as we'd never seen it before. Unlike the rocky inner planets of our solar system, Saturn is a gassy giant, with spectacular rings – made mostly of ice. It has at least 60 moons – of all different shapes and sizes. Enceladus, Saturn's sixth biggest moon, has geysers that shoot water vapour out into space, prompting the question: is there a liquid ocean of water underneath? Saturn's biggest moon is called Titan. When a Nasa probe was sent there, it revealed river valleys, dunes, and oceans of liquid methane. So it has been the advent of spacecraft that has allowed us to explore a mysterious planet 1.3bn km away from Earth