The Cassini–Huygens (commonly called Cassini) mission was a collaboration between NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI) to send a Probe to study the planet Saturn and its system, including its rings and natural satellites. The Flagship-class unmanned robotic spacecraft comprised both NASA's Cassini probe, and ESA's Huygens lander which would be landed on Saturn's largest moon, Titan. Cassini was the fourth space probe to visit Saturn and the first to enter its orbit.
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