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(Courtesy Charley Kohlhase)

Charley Kohlhase’s Solar System

The images that awed Voyager’s mission designer.

Io's Volcano

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(NASA)

“After [NASA astronomer] Linda Morabito had discovered Io’s volcano Pele in an optical navigation image, I never dreamed that it would be so huge, with sulfur and sulfur-dioxide products erupting to heights 30 times that of Mount Everest, and falling onto the surface over an area the size of France. I realized that tidal forces from Io’s slightly elliptical orbit about Jupiter were responsible for the interior heating to drive Pele, but never dreamed that hundreds of smaller volcanoes would be detected on Io in the years following Voyager.”

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