This photograph shows three simultaneous volcanic eruptions on the surface of Io, one of Jupiter's moons. The largest volcanic plume, at the moon's north pole, measures an astounding 180 miles high.
The photograph is part of a Jupiter collection taken over the past few weeks during NASA's New Horizons mission to Pluto. http://pluto.jhuapl.edu/gallery/missionPhotos/pages/030107.html via John Sadowski
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Nick.