ICE AND DUST make intricate layers at the edge of the polar cap. As scientists study the sequence of layers, they are unravelling the recent climate history of Mars. This view looks to the northeast. (A 3.6 MB version of the image is available.) Credit: NASA/JPL/Arizona State University, R. Luk (vertical exaggeration about 2x).
To explore this area in more detail, check out the THEMIS feature article.