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    Uranus is the seventh planet from the sun and the third largest (by diameter)


    Uranus is also a gas planet without a solid surface. It is composed mainly of rock and various ices with only about 15% hydrogen and a little helium. Its surface is like Saturn and Jupiter but without the liquid hydrogen layer.


    Far below a deep ocean of ammonia, methane, hydrogen and helium, lies a solid core several times as big as the earth. The core is not rocky but the material is uniformly distributed.


    The atmosphere is composed of 83% hydrogen, 15%helium and 2% methane. Bands of clouds blow rapidly around but are very faint. The blue colour of the planet is due to the absorption of red light by methane in the upper atmosphere, and the planet appears as a featureless blue-green disk. There maybe coloured bands but these are hidden from view by the methane layer.


    In the north and south pole the winter lasts 42 years and the sun is never visible. Then comes the spring equinox in which the sun is in the sky for 42 years.


    Uranus' magnetism is generated by motion at relatively shallow depths. It is odd as it is not centered on the center of the planet. The planet is tilted 60 degrees with respect to the axis of rotation.


    There are eleven faint rings, all of which are very dark. They are made up of fairly large particles up to 10 meters in diameter, as well as fine dust.

 Uranus Links


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Uranus factsheet

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Uranus missions

Uranus science summary

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