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Venting Gases

On the floor of the northern-most caldera in this image lies a bright blue patch. Scientists believe that patch may be gas clouds spewing from volcanic vents. The clouds may condense to form extremely fine particles that appear blue. Because Voyager 1's infrared spectrometer discovered sulfur dioxide on Io, it is possible that sulfur dioxide is the main ingredient of the clouds. Such clouds would rapidly freeze and snow back to the surface. It is also possible that dark areas on the caldera floors are pools of molten sulfur, a very dark form of sulfur.

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