HERITAGE DAILY Mercury has solid inner core
- The smallest planet in our solar system, Mercury, has a massive solid inner core.
- Mercury has a solid inner core about 2,000 kilometers in diameter, making up about half of Mercury’s entire core.
- The planet has a weak magnetic field generated by circulation of molten metal in that liquid core.
- The solid inner core makes up about half of the total core. The entire core is 85% of the planet.