Uranus
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Uranus is the seventh planet from the Sun. It was discovered by William Herschel in 1781. Uranus lies more than 2,800 million km from the Sun. At this distance, the temperature of its cloud tops is -214 degrees C. It moves quite slowly and has a long way to travel, so each orbit lasts 84 years. Uranus is a giant world, the third largest planet in our Solar System. 64 Earths would fit inside it. Despite its size, it spins rapidly. A day on Uranus lasts only 17 hours 14 minutes. Uranus spins like a top knocked over on its side. This means that the Sun is sometimes directly overhead at the poles. Each pole has a summer and a winter lasting 21 years.
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