Two years ago, however, Cassini's imagery revealed that it has ice volcanoes that spew streams of frosty material hundreds of miles into space and into the planet's E ring. Could this frozen debris be a danger to Cassini's instruments? Not according to Larry Esposito (University of Colorado), principal investigator for the spacecraft's Ultraviolet Imaging Spectrograph.
In results presented today at the European Planetary Science Congress, Esposito described UVIS observations that indicate the frozen jets contain particles too small to do any damage. Furthermore, he and his colleagues found no evidence for any high-pressure fountains that could loft larger pieces. Esposito says, "The chances are that Cassini should be unharmed by the flyby."