Saturn

Saturn is best known for its fabulous ring system that was discovered in 1610 by the astronomer Galileo Galilei. Its polar diameter is 90% of its equatorial diameter, this is due to its low density and fast rotation. Saturn turns on its axis once every 10 hours and 34 minutes giving it the second-shortest day of any of the solar system's planets.

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 of about nine-and-a-half times that of Earth.It has only one-eighth the average density of Earth, but is over 95 times more massive.