Believe it or not, this isn't the Death Star! It is actually Mimas, one of the moons of Saturn. The huge crater on Mimas (known as Herschel) is 80 miles across - almost 1/3 of the diameter of the entire moon. Herschel's walls are 3 miles high, parts of its floor measure 6 miles deep, and the central peak rises 4 miles above the crater floor. The impact that made this crater must have nearly destroyed Mimas. Fractures can be seen on the opposite side of Mimas that may be due to the same impact.