Night and Day in Melas Chasma on Mars

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 . The above picture is a superposition of two infrared images , a black and white image taken during Martian daylight and a false-color image taken at night. For the daytime image , dark colors mean cool temperatures, dropping from about -5 degrees Celsius to low as -35 degrees Celsius . Shadowed regions appear particularly dark, while grooved structure on the floor of Melas Chasma indicates successively overlapping landslides . In the nighttime swath , blue areas have cooled relatively quickly, indicating a composition of fine-grained dust and sand .