NASA / JPL-Caltech / UA / annotations by Emily Lakdawalla
Phoenix landing site monitoring from HiRISE: January 6, 2010
As spring comes to Mars, the area is illuminated by a Sun that is a reasonable 30 degrees above the horizon; still, not all of the seasonal carbon dioxide frost has yet sublimated. It is especially concentrated in the topographic lows between the polygonal patterns in the polar soil.
Image scale is 25 cm/pixel. North is to the left. From HiRISE image ESP_016160_2485.