Answer:
Four robotic spacecraft have visited Saturn. NASA's Pioneer 11 provided the first close look in September 1979. NASA's twin Voyager 1 and Voyager 2 spacecraft followed up with flybys nine months apart in 1980 and 1981.Each flyby revealed intriguing details about the ringed giant world, but it wasn't until the international Cassini mission arrived in orbit in 2004 that our understanding of Saturn really started to take shape. Cassini studied Saturn from orbit for 13 years before its human engineers on Earth transformed it into an atmospheric probe for its spectacular final plunge into the planet in September 2017. Cassini also carried ESA's Huygens Probe, which landed on Saturn's moon Titan in 2005.
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