Saturn is a gas giant because it is predominantly composed of hydrogen and helium.
It lacks a definite surface, though it may have a solid core.
Saturn's rotation causes it to have the shape of an oblate spheroid; that is, it is flattened at the poles and bulges at its equator.
Its equatorial and polar radii differ by almost 10%: 60,268 km versus 54,364 km.
Jupiter, Uranus, and Neptune, the other giant planets in the Solar System, are also oblate but to a lesser extent.
The combination of the bulge and rotation rate means that the effective surface gravity along the equator, 8.96 m/s², is 74% that at the poles and is lower than the surface gravity of Earth.
However, the equatorial escape velocity of nearly 36 km/s is much higher than that for Earth.

Saturn is the only planet of the Solar System that is less dense than water—about 30% less.
Although Saturn's core is considerably denser than water, the average specific density of the planet is 0.69 g/cm³ due to the atmosphere.
Jupiter has 318 times Earth's mass, and Saturn is 95 times Earth's mass.
Together, Jupiter and Saturn hold 92% of the total planetary mass in the Solar System.
Saturn is a gas giant because it is predominantly composed of hydrogen and helium. It lacks a definite surface, though it may have a solid core. Saturn's rotation causes it to have the shape of an oblate spheroid; that is, it is flattened at the poles and bulges at its equator. Its equatorial and polar radii differ by almost 10%: 60,268 km versus 54,364 km. Jupiter, Uranus, and Neptune, the other giant planets in the Solar System, are also oblate but to a lesser extent. The combination of the bulge and rotation rate means that the effective surface gravity along the equator, 8.96 m/s², is 74% that at the poles and is lower than the surface gravity of Earth. However, the equatorial escape velocity of nearly 36 km/s is much higher than that for Earth.
Saturn is the only planet of the Solar System that is less dense than water—about 30% less. Although Saturn's core is considerably denser than water, the average specific density of the planet is 0.69 g/cm³ due to the atmosphere. Jupiter has 318 times Earth's mass, and Saturn is 95 times Earth's mass. Together, Jupiter and Saturn hold 92% of the total planetary mass in the Solar System.
Saturn