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Io looks like a space pizza. This is due to its very high volcanic activity which is stronger than everything we know. The volcanoes of Io steadily eject clouds of sulfur.
This is caused by the high gravitational force of near Jupiter and the following tidal power.

Distance to Jupiter: 421 700 km
Mass: 8.93 * 1022 kg
Diameter: 364 km
Orbit period: 1.77 days

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Photo: Nasa

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