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Planet Uranus Moons: 21 (and growing) Mass: 14.5 times the mass of Earth Diameter: 31,763 miles Year: 83.8 Earth years Day: 17.2 hours Temperature: -280 degrees F Distance from the Sun: 7th planet from the sun, 1.8 billion miles What is Uranus like? Uranus is the 7th planet from the sun. It is more than twice as far from the sun as Saturn. Uranus is a gas planet like Saturn and Jupiter, but, like its sister planet Neptune, Uranus is sometimes called an ice planet because much of the planet is made up of frozen elements. As a result, Uranus has the coldest atmosphere of all the planets in the Solar System. The surface of Uranus is made up of mostly hydrogen gas with some helium gas as well. The gas atmosphere makes up about 25% of the planet. This atmosphere is stormy, but not nearly as stormy or active as Saturn or Jupiter. As a result, the surface of Uranus is fairly featureless and uniform. One of Uranus' most unique features is that it rotates on its side. If you picture the sun and the planets of the solar system on a table, the other planets would rotate or spin like tops. Uranus, on the other hand, would roll like a marble. Most scientists agree that Uranus' odd rotation is because another large planetoid object collided with the planet with enough force to change its tilt. How does Uranus compare to Earth? Uranus is very different from earth. It's a gas giant, meaning its surface is gas, so you couldn't even stand on it. Being so much further from the sun, Uranus is much, much colder than earth. Also, Uranus' odd rotation in relation to the sun gives it very different seasons. The sun would shine on parts of Uranus for as long as 42 years and then it would be dark for 42 years. How do we know about Uranus? Uranus was first called a planet by British astronomer William Herschel. Herschel discovered Uranus by using a telescope. Prior to Herschel, Uranus was thought to be a star. Since then the only one space probe that has been sent to Uranus was the Voyager 2 in 1986. Voyager 2 brought us some detailed pictures of Uranus and its moons and rings. Fun Fact: Uranus is the only planet named after a Greek god rather than a Roman god. For more information on the Solar system: The Solar System The Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto Back to Kids Study Page Back to Ducksters Kids Home Page

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