SP Crater, a volcanic cone and flow in Arizona, is visible in this image obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft.

SP Crater, a volcanic cone and flow in Arizona, is visible in this image obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft. Instrument scientists designated radiation of 0.81 microns red, 0.66 microns green, and 0.56 microns blue. Vegetation is red in that combination. The image was obtained around 2001.

ASTER is one of five Earth-observing instruments launched Dec. 18, 1999, on Terra. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and data products. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate, Washington, D.C.

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