The moon is intimately familiar to most people simply because it's a constant in the night sky, but its interior is more of a ...

While researchers knew the moon had a fluid outer core, the question of whether a solid core existed remained ...

It is spherical and solid and made up of iron and nickel. Its temperatures can reach 5500°C. Outer core The outer core is the layer surrounding the inner core. It is made of liquid iron.

The next layer is the mantle, which makes up most of Earth's volume and is composed of dense, semi-solid rock. Then there is the outer core, made of liquid metal, and the inner core, a solid ball ...