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This colour image, acquired during Galileo's ninth orbit around Jupiter, shows two volcanic plumes on Io. One plume was captured on the bright limb or edge of the moon (inset, upper right), erupting over a caldera (volcanic depression), named Pillan Patera after a South American god of thunder, fire and volcanoes. The plume is 140 kilometres high. The craft passed almost directly over Pillan Patera in 1999 at a range of only 600 kilometres.
The second plume (inset, lower right), seen near the terminator (boundary between day and night), is called Prometheus after the Greek god of fire.
Also see: Saviours on Black Monday
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