By G.R. Plaza (UPM) (English version of the post «Los materiales de la Luna«) The view of the Moon delights us in unclouded nights. We can see its non-homogeneous surface: the different reflexion properties of the brighter and darker regions have made us to imagine on it a face or other images. Besides, we are surprised by these differences and we wonder what the materiales that reflect the Sun light so differently are. The first astronomers could imagine that the dark regions…