(Unlike the aforementioned, no Bothans were harmed in the obtaining of this data.)
In comparison if Earth were to have a crater of a relative size to Mimas' monster Herschel, it would be 2,500 miles across - about the distance from New York City to Los Angeles!
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Mimas is composed mostly of water ice and a small bit of rock. At its low surface temperature of -350 degrees Fahrenheit (-208 degrees Celsius) water is as hard as rock is here on Earth. Like its bigger sister moons Rhea and Dione, Mimas is covered with impact scars - it is literally one of the most heavily-cratered worlds in the solar system.
Unlike the similarly-sized Enceladus, though, Mimas lacks any current evidence of a subsurface ocean. Somehow its water has remained solidly frozen for a very long time despite being closer to to Saturn and having an even more eccentric orbit than Enceladus. Scientists are still trying to determine why this is the case.
Discovered in 1789 by German astronomer William Herschel, Mimas orbits Saturn at an average distance of 115,277 miles (185,520 km) - about half the distance that our moon is from us.
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And if you simply must have the comparison, the very real Mimas is - according to the resource site Wookieepedia - about 100 miles (160 km) wider than the fictional Death Star(s) of the Star Wars universe. It may lack laser turrets or a planet-destroying cannon but it's also well without any poorly-placed thermal exhaust shafts and, long after the destruction of the Galactic Empire, Mimas is still around.