apennine mountains

Arguably the finest of all the Moon's mountain ranges, particularly at lunar sunset, around the last quarter. They extend some 600km along the rim of the Mare Imbrium, forming the gargantuan equivalent of its crater wall. The slope from the mare surface to its highest summits, which exceed 5000m, is a comparatively steep 30°.

Photo: Patrice Poyet. The full size original of this can be seen in his large annotated collection of images, Poyet's Celestial HyperBook.

Inconstant Moon