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The four inner planets have a hard surface of rock covering a metal core. Mercury is the most metal dense with 70%, its overall density only surpassed by Earth. Objects beyond Mars consist mostly of either gas or rock mixed with ice. This seems to be caused during formation of our Solar System, when objects closer to the newly formed star could only form from elements with high melting points (iron, nickel, silicates). More volatile components like water and methane could only stabilise at a certain distance - thus forming gas giants, comets and cool rocks like Pluto.

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Description

The four inner planets have a hard surface of rock covering a metal core. Mercury is the most metal dense with 70%, its overall density only surpassed by Earth. Objects beyond Mars consist mostly of either gas or rock mixed with ice. This seems to be caused during formation of our Solar System, when objects closer to the newly formed star could only form from elements with high melting points (iron, nickel, silicates). More volatile components like water and methane could only stabilise at a certain distance - thus forming gas giants, comets and cool rocks like Pluto.

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