Layered Outcrops in Gusev Crater

NASA's Mars Exploration Rover Spirit acquired the images that went into this color composite with its panoramic camera around 1:00 p.m. martian time on its 270th martian day, or sol (Oct. 5, 2004). The view represents the panoramic-camera team's best current attempt at generating a "true color" view of what this scene would look like if viewed by a human on Mars. It was generated from a mathematical combination of six calibrated images acquired through filters for wavelengths between 430 nanometers and 750 nanometers.

http://photojournal.jpl.nasa.gov/catalog/PIA06938