Saturn is the sixth planet from the Sun and the second largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth.[10][11] Although only one-eighth the average density of Earth, with its larger volume Saturn is just over 95 times more massive. Saturn is named after the Roman god of agriculture, its astronomical symbol (♄) represents the god's sickle
| Diameter | 120,536 km |
| Mass | 5.68e26 kg |
| Temperature | 134 K (-139 °C) |
| Composition | Percentage |
|---|---|
| hydrogen | 96.0% |
| helium | 3.0% |
| methane | 0.4% |
| ammonia | 0.01% |
| hydrogen deuteride | 0.01% |
| ethane | 210 ppm |
| ammonia | 100 ppm |
| water | 15 ppm |
| ammonium hydrosulfide | 2.5 ppm |
Saturn is a gas giant because it is predominantly composed of hydrogen and helium ('gas'). 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, respectively