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This shows an active volcanic region on Io. The yellow and orange area is newly formed lava, and the dark areas show lava that has cooled down.
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Courtesy of NASA

Galileo Finds More Volcanoes on Io
News story originally written on June 2, 2000

The Galileo spacecraft photographed volcanoes on the surface of Io, one of Jupiter's moons. Scientists believe there are at least 300 volcanoes on the moon. These volcanoes are somewhat different than those on Earth. The small ones can erupt and then quickly turn dorment in weeks. Other ones stay active for many years at a time.

Last month, Galileo spotted large clouds of sulfur gas in the atmosphere and yellow snow. Galileo will continue to study Jupiter and its satellites, turning next to the moon Ganymede and Jupiter's Great Red Spot.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA