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This was the closest view of the old and massive storm that gives Jupiter its trademark, the Great Red Spot. This is not a storm as we know it on Earth; it has been raging on Jupiter for at least 400 years when humans first observed the giant planet. Three Earths can fit into the storm, which is similar to a hurricane. The Voyagers discovered many hurricane-like storm systems rampaging in Jupiter's atmosphere.
The biggest surprise that Voyager sent home was the discovery of active volcanos on the moon Io.
Here's another look at the volcanic activity on Io.