Diameter	51,118 km / 31.763 miles
Avg. distance from Sun	2,869,328,000 km / 1,740,200,000 miles
Number of known moons	27
Time taken to turn on axis	17 hours, 14 minutes
Time taken to orbit Sun	84 years
Surface gravity	1.11
Temp. at cloud tops	-200 °C / -328 °F

Uranus is the seventh planet from the Sun and the third largest in the Solar System. In 1781, Uranus was the first planet to be "discovered" - all of the other planets had been observed from Earth since ancient times. It is a dull blue colour, mainly consisting of frozen gas with a possible rocky core. Uranus has a faint ring system and has at least 27 moons orbiting it. The planet is unusual because it orbits the Sun on its side, possibly the result of a collision during the formation of the Solar System.