The origin of the Moon is explained by the theory of the impact between a body the size of Mars colliding with Earth while it was forming. The ejected material splattered the space around Earth. And, over time, it grouped forming the Moon. Three large layers form the inner structure of the Earth's satellite: core, outer core, and rocky mantle. The lunar crust is characterized by the presence of dark surfaces, called seas, and by innumerable craters, caused by the impact of meteorites. This infographic from the Ábaco collection is part of the series The Moon, which also includes the original titles: One Big Leap, No Secrets, Eclipses and The Moon and the Tides.