Mimas
Mimas is a small moon of Saturn famous for its large Herschel Crater, which makes it resemble the Death Star from Star Wars.
Mimas is one of Saturn’s smaller moons, but it has become famous for its striking resemblance to the Death Star battle station from the Star Wars films. This icy world is the smallest astronomical body that is rounded by its own gravity.
The Death Star Moon
Mimas’ most prominent feature is the enormous Herschel Crater, which spans about one-third of the moon’s diameter. This impact crater, named after the astronomer William Herschel who discovered Mimas in 1789, gives the moon its distinctive appearance.
The crater is so large that if you were standing on the far side of Mimas, the crater’s rim would tower above the horizon like mountain ranges. The crater floor is relatively smooth, suggesting it may have been resurfaced after the impact.
A Heavily Cratered World
While Herschel Crater dominates Mimas’ appearance, the rest of the surface is also heavily cratered. This indicates that Mimas has been bombarded by asteroids and comets throughout its history, but the Herschel impact was by far the most catastrophic.
The moon’s surface is composed primarily of water ice, with some rocky material mixed in. Mimas is tidally locked to Saturn, meaning the same face always points toward the planet.
Interior and Geology
Despite its small size, Mimas may have a differentiated interior with a rocky core and icy mantle. Some scientists have suggested that Mimas might have a subsurface ocean, though this is still under investigation.
The moon’s low density suggests it is mostly composed of water ice, similar to other Saturnian moons. However, Mimas shows fewer signs of geological activity compared to moons like Enceladus or Titan.
Exploration
Mimas was first imaged in detail by the Voyager spacecraft in the 1980s. More recently, the Cassini spacecraft provided stunning close-up images of Herschel Crater and the moon’s surface features.
Mimas remains one of the most visually striking objects in the Saturn system, and its resemblance to the Death Star has made it a popular subject in astronomy outreach and popular culture.