THE MOON
Landmarks of the Moon This view of the full moon shows its dark seas, or maria, and the two bright-rayed craters Tycho (near bottom) and Copernicus (directly north of Tycho). The main seas are the Oceanus Procellarum (far left), Mare Imbrium (top center), Mare Crisium (far right), Mare Tranquillitatis (directly left of Crisium) Mare Serenitatis (above Tranquillitatis), and Mare Fecundatis (beneath and right of Tranquillitatis).