Relative to the size of the planet, Mercury has the largest core of any planet.

Name: Relative to the size of the planet, Mercury has the largest core of any planet.
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Mercury's core makes up about 85% of its total volume, which is much larger proportionally than any other planet in our solar system. Mercury is a small planet with a diameter of only 4,879 km, but its core makes up about 85% of its volume, making it proportionally much larger than the cores of other planets in our solar system.

Relative to the Size of the Planet, Mercury Has the Largest