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• Io has active volcanos!
• Caused by warm interior bubbling out
• If Io is as big as our Moon, why is Io's interior warm and not the Moon's
• Tidal heating
• Io has no impact craters.  Why?
• Io is funny colored
• Sulfurous compounds
• "volcanos" are probably SO₂ (sulfur dioxide) geysers
• Material ejected from Io
• some electrons missing
• charges effected by magnetic fields
• material caught in Jupiter's magnetic field
• Io plasma torus
• material in plasma torus orbits every ~10 hours
• Io orbits every ~2 days

Io hemispheres

April 1997 vs Sept. 1997

Io plasma torus (one edge only)

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