Lava flows on Jupiter's satellite Io

Lava flows on Jupiter

Fig. 2.34 . Numerous volcano calderas and lava flows were discovered on Jupiterís innermost large moon, Io, in 1979 using an instrument aboard the Voyager 1 spacecraft. This Voyager 1 image of Ra Patera, a large shield volcano, shows flows up to 300 kilometers long emanating from a dark volcanic vent. The diffuse reddish and orange colorations are probably surface deposits of sulfur compounds. The bright whitish patches probably consist of freshly deposited sulfur dioxide frost. Ra is an Egyptian Sun god. (Courtesy of NASA/JPL.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University