Mimas was discovered by William Herschel on September 17, 1789. It is best known for its enormous impact crater, Herschel, whose central peak gives the moon a resemblance to the Death Star from Star Wars. Composed primarily of water ice, Mimas has a low density and orbits Saturn synchronously, always showing the same face to the planet. Scientists theorize that Mimas may have played a role in forming the Cassini Division—a prominent gap in Saturn’s rings. Recent data suggests that a young, global subsurface ocean may exist beneath its heavily cratered surface, likely maintained by tidal forces from Saturn and orbital resonances with nearby moons such as Enceladus and Tethys.