Lava flows on Jupiter's satellite Io

Lava flows on Jupiter

. Numerous calderas and lava flows are located in this Voyager 1 image mosaic of Io's volcanic plains. They are punctuated by dark snake-like tendrils of red, brown and black lava flows that are rich in sulfur. The bright whitish patches probably consist of freshly deposited sulfur dioxide frost. This scene is about 2.1 million meters long, indicating that the slopes of active volcanoes stretch as far as 200 thousand meters from the hot, black calderas into the cooler surrounding terrain. (Courtesy of JPL, NASA and the U.S. Geological Survey.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University