Public outreach image for a science paper that supports the existence of a somewhat melty transitional zone between the olivine mantle and the metallic core of the Moon. Shown: a solid metallic inner core (white), Liquid outer core (yellow), Low-viscosity zone (partial melt in red), Olivine mantle in grey, all topped by a 40km crustal layer.

https://eos.org/research-spotlights/the-moons-tides-hint-at-a-melty-lunar-layer