The innermost of Jupiter’s moons has been mapped, showing a highly volatile volcanic surface.
Discovered by Galileo over 400 years ago, Io is more then 25 times more volcanically active then Earth. Some 28% of the moon’s surface is covered in lava flow fields.
Io is unique in our solar system as the only object with no impact craters – a testament to its volcanic features.
Read more at University of Arizona