NASA's Phoenix Mars Lander widened the deepest trench it has excavated, dubbed "Stone Soup," (in the lower half of this image) to collect a sample from about 18 centimeters (7 inches) below the surface for analysis by the lander's wet chemistry laboratory. Phoenix's Surface Stereo Imager took this image on Sol 95 (Aug. 30, 2008), the 95th Martian day since landing. Credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University
