Moon
Io
Galilean moon of Jupiter
The most volcanic world known
Tidal flexing from Jupiter heats Io's interior, powering more than 400 active volcanoes that paint its surface in sulfur yellows and reds.
Key facts
Distance
421,700 km from Jupiter
Diameter
3,643 km
Orbital period
1.77 days
Discovered
1610, Galileo
Orbits
Jupiter
Did you know
- Volcanic plumes rise up to 400 km high.
- It has almost no water.
- Its surface is constantly resurfaced by lava.
