NASA launched Cassini in October 1997, and the nuclear-powered probe reached the Saturn system after seven years of flight. After it dropped off a probe called Huygens in 2004, it began circling the planet and spying on its vast collections of moons and rings. In a few days, to prevent contaminating Saturn's (possibly life rich) moons when Cassini runs out of fuel, the probe will take a final death plunge into Saturn itself. It may have been an artificial probe, with no soul and made up of metal