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Saturn stands out as the second-largest planet in our Solar System, with an average radius approximately nine times that of Earth. Its equatorial radius measures about 60,268 km, while the polar radius is slightly smaller at around 54,364 km, illustrating a notable flattening at the poles. Despite its massive volume, Saturn's density is remarkably low—only about 30% of water's density—making it the only planet in the Solar System less dense than water.