Mercury, Venus, and Mars are all planets that resemble Earth’s surface. These planets are catagorized as terrestrial planets which means they are planets that are primarily composed of silicate rocks. Terrestrial planets are substantially different from gas giants, which might not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states. Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle.
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