Terrestrial_planets

From closest to furthest from the [[sun]]:

[[Mercury]]

[[Venus]]

[[Earth]]

[[Mars]]

Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle.  The [[Moon]] is similar but lacks an iron core.  At one time there were probably many more terrestrials, but most have been ejected from the solar system or otherwise destroyed.

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Also see [[gas giants]] and [[solar system]]