Talk about high speed maneuvers, today, Cassini will storm through a jet of water vapour and frozen particles erupting from the south pole of Enceladus, one of Saturn’s many moons.  A global liquid ocean is believed to exist beneath the frozen crust of 480-kilo metre-wide Enceladus.   This dive will be the deepest one yet through one of its plumes.  Cassini was launched in 1997 and uses plutonium reactors to speed it along.   The youtube video is understandable and compelling enough to keep the attention of teenagers  https://www.youtube.com/watch?v=BZ1KowQXc3Y