* Mercury: Has a massive core that makes up about 85% of its radius. This core is mostly iron with a solid inner core and a liquid outer core.
* Moon: Has a much smaller core, estimated to be about 20-40% of its radius. The Moon's core is composed of iron and sulfur, with a solid inner core and a partially molten outer core.
Therefore, Mercury's core is significantly larger, both in absolute size and as a proportion of the planet's total radius, compared to the Moon's core.
