Volcanic eruptions on Jupiterís moon Io

Volcanic eruptions on Jupiterís moon Io

Fig. 9.13 . A bluish plume rises about 140 kilometers over the bright limb, or edge, of Io (left), above the volcanic depression, or caldera, named Pillan Patera. In the middle of the image, near the night/day shadow line or terminator (right), the ring-shaped Prometheus is seen, while casting a shadow to the right of the volcanic vent. It is called Prometheus, after the Greek god who gave mortals fire. The Prometheus plume is visible in every image of Io from the Galileo spacecraft, including this one acquired in 1997, as well as every Voyager image of Io acquired 18 years before in 1979, suggesting continued activity from the same volcano for decades. (Courtesy of NASA/JPL/U. Arizona.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University