FIGURE 1.1 Glaciers on Mars. Ice-rich material seems to have flowed from the smaller crater nestled against the mountain into the lower, larger crater at the base. The craters, which are located at the eastern edge of Hellas Basin, contain the traces of glaciers. The smaller crater is 9 km across, and the larger crater is 16 km across. Image courtesy of ESA/DLR/FU Berlin (G. Neukum).