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Inner planets (up until Mars):

- are mostly composed of dense rocky material with high melting points;

- have small diameters;

- have high tempeatures;

- take few time to make a complete turn around the sun;

- have few or no moons;

- all have impact cracters;

Outer planets:

- are mostly composed of gases;

- have very large diameters (compared to the inner planets);

- have low temperatures;

- take a long time to make a complete turn around the sun;

- generally have several moons;

- no impact craters known (so far since no one as made it to the rocky core of these planets).

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