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A massive dust plume, estimated to be 150 miles (240km) high, can be seen erupting from Io's Tvashtar volcano.
It is surrounded by a dark patch the size of Texas consisting of the fallout from the eruption.
Europa is an attractive target; planetary scientists consider it one of the best places in the Solar System to find extraterrestrial life forms.
Beneath its outer shell of ice, the moon is thought to host an ocean of water warmed by heat from the interior.