Moon

The Moon (Latin: Luna) is Earth's only natural satellite and the fifth largest natural satellite in the Solar System.

The Moon makes a complete orbit around the Earth every 27.3 days (the orbital period), and the periodic variations in the geometry of the Earth–Moon–Sun system are responsible for the lunar phases that repeat every 29.5 days (the synodic period). It is in synchronous rotation, meaning that it keeps nearly the same face turned towards the Earth at all times and so rotates on its axis every 27.3 days too.

Geochemical mapping from orbit implies that the crust of the Moon is largely anorthositic in composition, consistent with the magma ocean hypothesis. In terms of elements, the crust is composed primarily of oxygen, silicon, magnesium, iron, calcium, and aluminium. Based on geophysical techniques, its thickness is estimated to be on average about 50 km. Most of the Moon's mare basalts erupted during the Imbrian period 3.0–3.5 billion years ago. Nevertheless, some dated samples are as old as 4.2 billion years,[44] and the youngest eruptions, based on the method of crater counting, are believed to have occurred only 1.2 billion years ago.

Moon in "La Différence"
After the surprise Japanese attack on Sengen Base, they landed crawlers from their Moon Base to search out survivors. Two of these crawlers, under the overall command of Sublieutenant Mitsuo Onishi, pursued the crawler of Renée Messier and Alec Hall.