English: Antarctic Expedition Prepared Researchers for Mars Project. Four of the expedition members scout out field sites in Antarctica's Beacon Valley, one of the most Mars-like places on Earth. From left: Aaron Zent, of NASA Ames Research Center, Moffett Field, Calif.; Chris McKay, also of NASA Ames; Peter Smith, of the University of Arizona, Tucson; and Doug Ming, of NASA Johnson Space Center, Houston. Image credit: NASA