Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about geologically active moons.

NASA's Juno spacecraft has provided new insight about Jupiter's massive polar cyclones and what's going on beneath its volcanic moon Io.

NASA’s Juno spacecraft identifies over 40 enormous lava lakes on Io, shedding light on the extreme volcanism sculpting Jupiter’s moon.

Extreme volcanism Io's intense volcanic activity is the result of "tidal flexing," where the moon is continuously being squeezed and released like a stress ball by Jupiter's crushing gravity.

The biggest ever volcanic eruption in our solar system has been recorded, and it puts our Eyjafjallajökull in the shade.

The acid yellow moon Io that orbits Jupiter may be less than 30% the size of Earth, but is considered the most volcanic body in our solar system. As demonstrated by explosive news from NASA on ...

Io, which is roughly the size of Earth’s Moon, undergoes immense tidal stress due to its close orbit around Jupiter. The gravitational forces from the gas giant stretch and squeeze Io, which generates ...

NASA's Juno spacecraft has spotted the most powerful volcanic eruption ever seen on the solar system's most volcanic body, the Jovian moon Io.

Io is volcanic because of tidal heating. Io is the innermost of Jupiter's four Galilean moons and is roughly the same size as Earth's Moon. However, it's very close to the much larger Jupiter, follows ...