土星 (Saturn) is the sixth planet from the Sun and is known for its stunning rings made of ice and rock particles. It is a gas giant, primarily composed of hydrogen and helium, and has a diameter about nine times that of Earth. Saturn has a very low density, meaning it could float in water if there were a body of water large enough. Saturn has at least 82 moons, with 泰坦 (Titan) being the largest and one of the most intriguing, as it has a thick atmosphere and liquid lakes. The planet's unique features and numerous moons make it a fascinating subject of study in astronomy.