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Uranus - Uranus discoveredin1781( mass=15xEarth...

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Uranus Introduction and General Properties  discovered in 1781 (doubled size of known solar system !) Uranus is much smaller than Jupiter or Saturn mass = 15 x Earth volume = 64 x Earth albedo = 0.66 . . . . cloud covered density = 1.3 g/cm 3 => more like gas or liquid Motions orbit: orbital period = 84 years rotation: rotation period = 17 hours o fast equator rotates faster than poles o "differential rotation" rotation axis tilted 98 degrees o laying on it's side ! o from Earth looks like a bull's eye o long seasons o was this from a collision with a giant planetisimal ? Figure 9.22 also shows this tilt.  [Link to Figure 9.22] Here is a link to a picture showing how the planet is oriented. Interior observe magnetic field since it rotates, expect liquid inside
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magnetic axis is tilted a lot from rotation axis - Why ?
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