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The four inner, rocky planets are also known as the terrestrial planets. These are; Mercury, Venus, Earth and Mars.

These have much smaller diameters than the outer gas giant planets (Jupiter, Saturn, Uranus, Neptune)

The inner planets have higher densities than the outer planets, despite being smaller and much lower in mass.

The inner planets have a clearly defined surface.

The inner planets are warmer and are much closer to the sun. The closer to the sun the planet is, the shorter its orbit period.

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