A team of scientists led by Frank Postberg of the University of Heidelberg used Cassini's Cosmic Dust Analyzer to directly examine the plumes of the Saturn moon Enceladus during three flybys by the Cassini spacecraft. Individual particles were analyzed as they hit a metal target, and the ones closer to the moon's surface were found to have a high salt content.
Cassini discovered plumes of water vapor shooting from the southern hemisphere of Enceladus in 2005. The geysers erupt from four parallel trenches known as the "tiger stripes." Scientists theorize that there may be an ocean of salt water hidden beneath the planet's surface.