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Compared to the outer planets (gas giants), the four inner planets are small, have a greater average density, and receive most of their heat from the Sun.

Mercury, Venus, Earth, and Mars are compact rocky planets, with a solid surface rather than a thick atmosphere. Their masses give them less gravity, but they contain a greater percentage of heavy elements, such as iron and zinc, than the larger planets. Without the Sun's radiation, their surfaces would be considerably cooler, as can be seen by the lower temperatures on Mars compared to Mercury and Venus.

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