Cassini-Huygens Home The Cassini-Huygens Mission to the Saturnian system is a multinational cooperation between three space agencies and 17 nations. Starting in 2004, the spacecraft will explore Saturn, its mysterious rings and its many moons. The Cassini spacecraft will orbit the ringed planet for four years. The Huygens probe will dive into the atmosphere of Titan, Saturn's biggest moon. [NULL] jpl in Science & Tech.with cassini-huygenscooperationmissionmultinationalsaturniansciencesystemtechby 5 users