Uranus is the lightest of the outer planets, a type of gas giant that some scientists call an ice giant. As you can imagine from this nickname its atmosphere is very cold - the coldest in the solar system. The wind on Uranus can blow at over 500 miles per hour!
It was discovered by William Herschel, a famous astronomer, while systematically searching the sky with his telescope on March 13, 1781.
Uranus has been visited by only one spacecraft, Voyager 2 on Jan 24 1986. The picture on the left is an enhanced image of Uranus that was beamed back to Earth by Voyager 2.
Uranus is 2,880,000,000 km away from the sun.
