Saturn's Moon Dione . ... Credit Copyright: NASA , Voyager 1, Copyright Calvin J. Hamilton Explanation: Dione , one of Saturn 's larger moons, is remarkable for its bright surface streaks. These streaks run across some of Dione's many craters, which indicate that the process which created the streaks occurred later than the process which created the craters. ... Dione was discovered by Giovanni Cassini in 1684. ... This moon, once designated "Dione B", precedes Dione by about 1/6th of an orbit. ...