This artist's conception shows the interior of the moon based off of new research by NASA. The moon contains 5 major divisions in its interior. It possesses a solid, iron-rich inner core with a radius of nearly 150 miles and a fluid, primarily liquid-iron outer core with a radius of roughly 205 miles. It has a partially molten boundary layer around the core estimated to have a radius of nearly 300 miles followed by the mantle and then the crust. The moon's crust varies from tens of kilometers in depth (under mare basins) to more than 100 kilometers in some highland regions, with an average thickness of about 70 kilometers.