Uranus is a planet that is the third biggest in the solar system, and it is about four times bigger than the planet Earth. It is also the seventh planet from the sun. It takes 17 hours and 14 minutes for Uranus to complete a full rotation on its axis. It takes a much longer time for the planet Uranus to rotate around the sun. In fact, it takes over 84 years for this planet, which was discovered in 1690, to completely orbit around the sun.