Last updated on April 20, 2014 at 21:20 EDT
Zal Patera Io in color
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Zal Patera, Io, in color

September 26, 2003
The Zal Patera region of Jupiters volcanic moon Io is shown in this combination of high-resolution black and white images taken by NASAs Galileo spacecraft on November 25, 1999 and lower resolution color images taken by Galileo on July 3, 1999. By combining both types of images, Galileo scientists can better understand the relationships between the different surface materials and the underlying geologic structures. For example, in the center toward the top of the picture, the edge of the caldera, or volcanic crater, is marked by the black flows, and it coincides with the edge of a plateau. Also, the red material(just above and to the right of the center of the image) is typically associated with regions where lava is erupting onto the surface. Here the red material follows the base of a mountain, which may indicate that sulfurous gases are escaping along a fault associated with the formation of the mountain.