Iron planet facts for kids
An iron planet is a planet whose core consists of mostly iron. These planets often have a small mantle and a very large core. Mercury is known to be an iron-rich planet - and is the largest celestial body in the Solar System to be so.
In science fiction, these planets are sometimes called "cannonballs".
See also
In Spanish: Planeta de hierro para niños
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Iron planet Facts for Kids. Kiddle Encyclopedia.