.

Accordingly, which planet has the largest core?

Mercury's

Likewise, do all planets have an iron core? Every inner planet has a core. The cores of Mercury, Venus, and Earth are composed of iron-nickel. Mars's core is made of liquid iron sulfide mixed with some nickel.

Keeping this in consideration, why does Mercury have a large iron core?

Mercury's core has more iron than any other planet in the solar system. Scientists think this had to do with its formation and early life. If the planet formed quickly, increasing temperatures of the evolving sun could have vaporized much of the existing surface, leaving only a thin shell.

Does Jupiter have an iron core?

The short answer is, we don't know… yet. In truth, it could very well have a solid core composed of iron and quartz, which is surrounded by a thick layer of metallic hydrogen.