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Outer
planets
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Uranus
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rotation
axis tipped at 98 degrees
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rotates
retrograde (like Venus, Pluto)
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blue
color caused by absorption of red light by methane in atmosphere
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Neptune
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internal
heat source (like Jupiter, Saturn) causes more circulation than Uranus
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more
or less clouds than Uranus?
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Pluto
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Pluto
and its moon Charon always have the same faces pointed to each other
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