Titan

Titan, Saturn's largest moon, is a captivating celestial body. With an atmosphere thicker than Earth's and stable surface liquids, it is unique in our Solar System. Titan is one of seven rounded moons orbiting Saturn and is frequently likened to a planet due to its immense size. It surpasses Earth's Moon in both diameter and mass by 50% and 80%, respectively. Among the Solar System's moons, only Jupiter's Ganymede is larger. Titan even exceeds the planet Mercury in size, though it is only 40% as massive since Mercury is primarily composed of dense iron and rock, while Titan contains a significant portion of less-dense ice.