Moon
Io
TypeMoon
Mass8.932 × 10²² kg
Diameter3,643 km
Orbital Radius421,700 km
Orbital Period1.77 days
Rotation Period42.46 hours
Known Moons0
Surface Gravity1.8 m/s²
Average Temp-143 °C
AtmosphereSO2 (thin)
Discovered ByGalileo Galilei
Discovery Year1610
About Io
The most volcanically active body in the solar system. Over 400 active volcanoes. Tidal heating from Jupiter gravity drives this activity. Surface covered in sulfur and sulfur dioxide frost, giving it a colorful appearance. Volcanic plumes reach 500 km high.
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