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The Outer Planets

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Across
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The largest most massive planet
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Neptune was discovered as a result of a ____________ prediction
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The 4 outer planets are also called ________ ________ because they are so large.
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Neptune's largest moon
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Saturn's atmosphere is made up of___________ and helium.
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Pluto is considered a ________ planet
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Uranus and _____________ look like twins
Down
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Uranus was discovered by this scientist
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All gas giants have no real, solid __________
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Jupiter's 4 moons are Io, Europa, Ganymede, and ___________
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Pluto's orbit is __________
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He discovered Jupiter's four largest moons.
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The Great Dark Spot on Neptune was due to a _______
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Uranus has a blueish green color due to this item in the atmosphere.
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Uranus's axis of rotation is _____________
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Saturn's largest moon
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Name of spacecraft/probe to travel to these planets
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Each outer planet is surrounded by a set of _______