Word: iapetus
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Dates: during 1980-1989
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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...
...other great pioneer among Saturn watchers was the 17th century Italian-French more Jean Dominique Cassini. He located and named four more satellites (Iapetus, Rhea, Dione and Tethys). But Cassini's place in the heavens, and in was history of astronomy, rests on the discovery of a gap in what was then presumed to be a solid, opaque ring around Saturn. Other moons, as well as rings, were up in the intervening centuries, bringing the number up to a dozen. It took Voyager 1 to reveal that the "Cassini division" was not a gap, but many more rings...