Word: iapetus
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...sharp blow delivered on the opposite side of its globe, which is dappled with craters and highlands. Dione resembles the earth's moon, marked by all sorts of craters, big and little, features that look like our moon's "seas," and ice flows, rills and highlands. Iapetus, one of the most curious of Saturn's moons-one hemisphere is five or six times as bright as the other -was seen only from a vast distance...