The difference between inner planets and outer planets inner planets outer planets Inner Planets Outer Planets 1. Mercury, Venus, Earth and Mars are called Inner Planets 1. Jupiter, Saturn, Uranus, Neptune and Pluto are called Outer Planets 2. They are found between belt of asteroids and the sun 2. They are found after the belt of asteroids 3. They are also called terrestrial planets 3. They are called Jovian planets 4. Smaller in size 4. Larger in size 5. High density 5. Low density 6. Solid rocky state 6. Gaseous state 7. They are warm 7. They are cold