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Mercury the metal is a pure substance so it is made of nothing but mercury; or, if you like, it is made up of electrons, protons and neutrons.

Mercury the planet is approximately 70% metallic (mostly iron) and 30% silicate material.

Because Mercury is closer to the center of the Solar System it is made up of much denser material than the other outer planets, with a much higher concentration of metal and has the highest density of any terrestrial body in the solar system.

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10y ago

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