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The Outer Planets
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Characteristics of the Outer Planets
Large, mostly gaseous planets Small, rocky core Found PAST the asteroid belt Many moons
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Most of the Outer planets are: Large, Gas Giants except Pluto
The Gas Giants…..and the Inner planets
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Jupiter Largest Planet Atmosphere: Hydrogen and Helium
16 Moons – (4 Large Moons) (Ganymede, Europa, Callisto, Io ) Great Red Spot (Huge Storm) Space Probes: Voyager-Galileo Thin ring system Day: 10 hrs Year: 12 Years
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Jupiter
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Saturn 2nd Largest Planet Large ring system-ice, rock, dust
About 18 Moons (18-21) Space Probe: Voyager-Cassini Atmosphere: Hydrogen, Helium Titan: Moon with an Atmosphere Day: 10 hours Year: years
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Saturn
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Uranus About the size of Neptune Discovered by William Herschel 1781
Atmosphere: hydrogen, helium methane About 15 Moons Thin ring system Rotates on its side Rocky core Voyager space probe Day: 18 hours Year: 84 years
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Uranus
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Neptune A little smaller than Uranus Methane atmosphere
Last planet seen by Voyager Rocky core 8 Moons (Triton) Thin ring system Great dark spot Day: 19 hours Year: 165 years
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Neptune
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Pluto “Dwarf” Planet Icy/rocky Planetoid
1 Moon-Charon (“double planet”) Thin atmosphere-frozen gases Space probe: New Horizon 2015 Pluto is one of many “Planetoids” Day: About 6 Earth days Year: 248 Earth Years (tilted orbit)
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Pluto
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