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Uranus was discovered by William Herschel in 1781, who thought it was a comet.The seventh planet from the Sun, Uranus is a gas giant. It is the third largest planet in our Solar System with a diameter four times bigger than the Earth, and is unusual in that it rotates on its side. This may be result of collision with large object in the early days of the solar system. As a result, the polar regions of this planet sometimes receive more solar radiation than its equator.

Its bluey-green appearance is a result of the absorption of red light by its upper atmosphere, which consists mainly of methane. It has faint bands of clouds which can only be seen with image enhancement. The temperature at the cloud tops is about -215 degrees C

It lies two billion miles away from the Sun (almost 20 times further than Earth). A day on Uranus lasts 14 hrs 42 mins (so it rotates very fast), and a year lasts 84 Earth years.

Uranus has a system of rings (like Saturn but not as impressive) made up of dust and small debris, which were discovered in 1977.

It has at least twenty moons, all named after characters from Shakespeare plays, the five biggest are Ariel, Umbriel, Titania, Miranda and Oberon.