Melas Chasma, Day and Night
This image is a mosaic of day and night infrared images of Melas
Chasma taken by the camera system on NASA's Mars Odyssey spacecraft.
The daytime temperature images are shown in black and white,
superimposed on the martian topography. A single nighttime temperature
image is superimposed in color. The daytime temperatures range from
approximately -35 degrees Celsius (-31 degrees Fahrenheit) in black to -5
degrees Celsius (23 degrees Fahrenheit) in white. Overlapping landslides
and individual layers in the walls of Melas Chasma can be seen in this
image. The landslides flowed over 100 kilometers (62 miles) across the
floor of Melas Chasma, producing deposits with ridges and grooves of
alternating warm and cold materials that can still be seen. The temperature
differences in the daytime images are due primarily to lighting effects, where
sunlit slopes are warm (bright) and shadowed slopes are cool (dark). The
nighttime temperature differences are due to differences in the abundance
of rocky materials that retain their heat at night and stay relatively warm
(red). Fine grained dust and sand (blue) cools off more rapidly at night.
These images were acquired using the thermal infrared imaging system
infrared Band 9, centered at 12.6 micrometers.
Jet Propulsion Laboratory, a division of the California Institute of
Technology in Pasadena, manages the 2001 Mars Odyssey mission for
NASA's Office of Space Science in Washington, D.C. Investigators at
Arizona State University in Tempe, the University of Arizona in Tucson
and NASA's Johnson Space Center, Houston, operate the science
instruments. Additional science partners are located at the Russian Aviation
and Space Agency and at Los Alamos National Laboratories, New Mexico.
Lockheed Martin Astronautics, Denver, is the prime contractor for the project,
and developed and built the orbiter. Mission operations are conducted
jointly from Lockheed Martin and from JPL.
Image credit NASA/JPL/Arizona State University.