Night and Day in Melas Chasma on Mars . ... Credit Copyright: Arizona State U. , JPL , NASA Explanation: What types of terrain are found on Mars? Part of the answer comes from thermal imaging by the robot spacecraft 2001 Mars Odyssey currently orbiting Mars . ... For the daytime image , dark colors mean cool temperatures, dropping from about -5 degrees Celsius to low as -35 degrees Celsius . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...