Thanks to data collected by the Juno probe last winter, researchers at NASA's Jet Propulsion Laboratory (JPL) have learned that Io's volcanoes are fed by tidal flexing, which melts part of its interior and produces a steady stream of white-hot magma.

New measurements from NASA's Juno probe have seemingly put to bed the possibility of a magma ocean beneath the surface of Io.

Io, roughly the size of Earth's Moon, is home to approximately 400 volcanoes that continuously erupt, contributing to its dynamic surface.