Mimas - One of Saturn's Icy Moons
Mimas is one of the innermost of Saturn's moons. One of the most
significant features of this moon is the crater known as Herschel's
Crater. This crater is about 80 miles wide, and 6 miles deep! It
even has a peak in the middle which rises to about 4 miles, which is
comparable to Mount Everest on Earth. The significance in the size
of the crater is magnified because the diameter of Mimas itself is
only about 250 miles. So the crater goes across about 1/3 of the
moon's diameter. It was said that if the object that hit Mimas
would have been any larger, Mimas would have been disintegrated.
There is even evidence of fractures on the side opposite of
Herschel's Crater on Mimas.
Other Icy Moons
Enceladus - displays at least 5 different types of
terrain - interior of moon may be liquid
Tethys - has a large trench 65 km wide across its
surface
Dione - has rocky core that makes up 1/3 of the moon's
mass - the rest is water-ice
Rhea - new impact events wipe out as many old craters as
the new ones created
Iapetus - has a mysterious dark coat, probably caused by
methane eruptions
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