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The outer planets are much larger than the inner ones.
The planets in the solar system that are farthest from the Sun, including Jupiter, Saturn, Uranus, and Neptune.
The outer planets have many moons.
Astronomers study the outer planets to learn more about our solar system.
The outer planets are known for their thick atmospheres.
outer planets exploration
outer planets characteristics
outer planets distance
gas giants
Jovian planets
distant planets