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The Outer Planets

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