This color image was acquired by the Surface Stereo Imager on NASA's Phoenix Mars Lander on the 25th day of the mission, or Sol 24 (June 19, 2008).
The trench, called "Dodo-Goldilocks," is lacking lumps of ice seen previously in the lower left corner. The ice sublimated, a process similar to evaporation, over the course of four days.
The Phoenix Mission is led by the University of Arizona, Tucson, on behalf of NASA. Project management of the mission is by NASA's Jet Propulsion Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin Space Systems, Denver.
Image credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University