Phoenix trench in the northern plains of Mars

Phoenix trench in the northern plains of Mars

Fig. 8.27 . Bright, subsurface water ice has been exposed in this trench dug by the Phoenix lander in the northern Martian plains. The false-color image enhances the visibility of morning frost, especially around the edges of the trench, which are 4 to 5 centimeters deep and about 23 centimeters long. The details and patterns surrounding the Phoenix lander showed an ice-dominated terrain as far as it could view. (Courtesy of NASA, JPL, U. Arizona.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University