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  • A terrestrial planet, telluric planet or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun. The terms are derived from Latin words for Earth, as these planets are, in terms of composition, "Earth-like". Terrestrial planets have a solid planetary surface, making them substantially different from the larger gas giants, which are composed mostly of some combination of hydrogen, helium, and water existing in various physical states. Wikipedia

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