NASA's Juno mission has delivered the first measurements of temperatures below the surface of Io, Jupiter's intensely volcanic moon. The findings point to substantial heating in the moon's shallow subsurface, adding a new layer of detail to scientists' understanding of how energy moves through one of the most geologically active places in the solar system.
Io is already known as the most volcanically active world orbiting the sun, with constant eruptions and widespread lava activity shaping its surface. By looking beneath the top layer, researchers can now better examine how heat is stored and released, rather than relying only on surface observations.
The new results were gathered during two close encounters by Juno, giving the spacecraft a rare opportunity to study Io in greater detail. Those measurements help researchers investigate the connection between internal heating and the moon's extreme volcanic behavior, which is driven by powerful gravitational forces linked to Jupiter.
The data could improve models of Io's interior and offer broader insight into how tidal heating affects moons throughout the solar system. For planetary scientists, the readings mark an important step in understanding what keeps Io so active and why its landscape remains in near-constant change.
