The Apollo astronauts placed instruments known as seismographs on the Moon to study about its interior. What we know about it now comes primarily from their studies.
The Moon is made up of different layers like any other celestial body. It has an outer crust, an inner mantle and an innermost core. The outer crust is hard, dry and dusty. It is almost 60 kilometres thick in the near side while it is almost twice as thick in the far side.
The mantle has a thick layer of rock at the exterior and is semi-rigid in the interior. The mantle runs down almost 800 kilometres. The Moon’s core is constituted of rocks rich in iron.
Picture Credit : Google