The most volcanic body in the solar system, Io is an infernal hellworld that constantly spits sulfurous magma into space. And a new study suggests that it's been that way for a long, long time.

Io’s long-debated magma ocean may not exist. Juno spacecraft data reveals that tidal forces deform the moon differently than expected if a magma ocean were present. Instead, Io’s mantle appears mostly ...

These new discoveries cement Saturn’s place as the winner of the Solar System’s moon competition, with more confirmed moons ...

The number of known moons in our Solar System has been rising for centuries, but astronomers say it has probably peaked – for ...

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