Adorned with thousands of beautiful ringlets, Saturn is unique among the planets. All four gas giant planets have rings -- made of chunks of ice and rock -- but none are as spectacular or as complicated as Saturn's. Like the other gas giants, Saturn is mostly a massive ball of hydrogen and helium. Distance from the sun: About 900 million miles, nearly 10 times as far as Earth is from the sun.
Year: About 29 Earth years.
Day: About 10.7 Earth hours.
Diameter: About 72,000 miles, nine times the size of Earth.
Effective temperature: - 288 degrees Fahrenheit.
Atmosphere: Hydrogen, helium.