CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Moon structure. Computer artwork showing the internal layers that make up the structure of the Moon. The Moon has a diameter of 3476 kilometres. It has a crust overlying a thick mantle layer, and a small solid core. The Moon is geologically dead. As it has no atmosphere or geological activity, its surface is still marked by craters from meteorite impacts from the last four billion years.
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