Definition of Mimas
astronomy
: the seventh largest satellite of Saturn with a diameter of approximately 250 miles (400 km) characterized by a single enormous crater
- The majestic saturnian rings, having beguiled astronomers for centuries, are targeted for intense study. Saturn's smaller satellites—such as Mimas, nicknamed the “Death Star,” and Iapetus, with its strange, organic-marked sur-face—will give up much of their secrets to Cassini.
- —Louis D. Friedman, The Planetary Report, March/April 1994
