janssen

This ancient walled plain is one of the most ancient features on the Moon. During the eons since its creation it has acquired many interesting features within its walls, including a conspicuous rille system, a mountain massif, and the large class 2 crater Fabricius.

Photo: António Cidadão. His Home Page of Astrophotography includes stereograms, animations, and "Seven Craters a Week" from his forthcoming photographic lunar atlas.

Inconstant Moon