This moon has "a geyser of icy particles shooting out of its south pole. . . The size and particles will provide clues as to why water vapor and ice particles about one ten-thousandth of an inch wide shoot off Enceladus’ surface at a speed of 800 miles per hour. The particles are mostly water ice, but the presence or absence of other elements and molecules will tell something about the inside of Enceladus." Enceladus is the name of this particular moon.