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The Inner Planets are: Mercury, Venus, Earth, and Mars! The Inner Planets are the 4 closest planets to the sun. And all the atmospheres are thick except for Mercury with no atmosphere at all! The outer planets are: Jupiter, Saturn, Neptune, Uranus, and Pluto! They are the farthest away from the sun. Jupiter has a Giant Red Spot. Saturn is the 2nd largest planet. And Pluto is the smallest and no longer a planet.