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planetary core

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Also known as core of a planet, core

innermost layer(s) of a planet

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The internal structure of the inner planets. The internal structure of the outer planets. The color of Neptune is exaggerated to differentiate it from Uranus.

A planetary core consists of the innermost layers of a planet. Cores may be entirely liquid, or a mixture of solid and liquid layers as is the case in the Earth. In the Solar System, core sizes range from about 20% (the Moon) to 85% of a planet's radius (Mercury).

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