Q:

What is the difference between inner and outer planets?

A:

Quick Answer

The main difference between inner and outer planets is that outer planets are larger and are mainly made of gas. The inner planets are Venus, Mercury, Mars and Earth, while the outer planets are considered to be Saturn, Uranus, Neptune and Jupiter.

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Full Answer

All of the inner planets are considered terrestrial planets due to the fact that their surfaces are made mostly of solids. These planets have no or few moons, with Earth having one moon, and Mars having two. In contrast, the outer planets are much more likely to have moons and rings. For example, Jupiter, known to be the largest planet in the solar system, has several moons.

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Related Questions

  • Q:

    How big is Uranus compared to Earth?

    A:

    Uranus is the smallest of the gas planets, but its diameter of 51,118 kilometers is still four times longer than the Earth's, according to Universe Today. The volume of Uranus is massive, as it could hold 63 Earths inside its perimeter.

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  • Q:

    Which planets have rings?

    A:

    All four of the gas giant planets in the solar system have rings. These are Saturn, Jupiter, Neptune and Uranus. The rings of Saturn are so prominent that they can be seen with binoculars on clear nights. The rings of the other planets are much more faint.

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  • Q:

    What are some facts about the inner planets?

    A:

    The inner planets are composed of rock and metals, and possess a solid surface not found in the gas giants of the outer solar system. Mercury, Venus, Earth and Mars are the four planets closest to the Sun, and all have molten metal cores and few moons.

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  • Q:

    Will all nine planets ever align?

    A:

    It is not possible for all nine planets to align perfectly because the axes around which they rotate tilt at different angles. The planets do end up within 90 degrees of each other about once every 200 years.

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