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Moon plume breaks the record

The Galileo spacecraft has found the tallest plume of material seen so far on Jupiter's moon Io, the only volcanically active moon known in the solar system. Towering 500 kilometers above Io–more than 50 times the height of Mount Everest and at least 10 percent higher than any previously detected plume–the vented gas emanates from a previously unknown hot spot near the moon's north pole.

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