This image, taken on Aug. 20, the 85th Martian day of Phoenix's mission, by the lander's Robotic Arm Camera shows some of the dirt sample, dubbed "Burning Coals," on the screen beneath the doors to one of TEGA's ovens. One of the cell's two doors is fully open, the other partially open. Credit: NASA/JPL-Caltech/University of Arizona/Max Planck Institute
