The Surface Stereo Imager on NASA's Phoenix Mars Lander caught this dust devil in action west of the lander at 11:49 a.m. local Mars time on Sol 104, or the 104th Martian day of the mission, Sept. 9, 2008. The dust devil visible in the center of this image just below the horizon is estimated to be about 400 meters (about 1,300 feet) from Phoenix, and 4 meters (13 feet) in diameter. Credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University
