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    •  Science >> Science Discoveries >  >> Astronomy
    Terrestrial Planets: Understanding Earth's Inner Neighbors - Mercury, Venus, Earth & Mars
    The four inner planets in our solar system are called the terrestrial planets.

    This is because they are all:

    * Rocky and have solid surfaces.

    * Smaller in size and mass than the outer planets.

    * Closer to the sun than the outer planets.

    The four terrestrial planets are:

    * Mercury

    * Venus

    * Earth

    * Mars

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